ChatGPT answers, unedited

If your main goal is popup + embedded signup forms that feed directly into your email lists and automations, I’d narrow the field to these:

1. ConvertFlow — my first place to look

convertflow.com

ConvertFlow is particularly strong if you want more than a simple newsletter popup. It supports popups, embedded forms, multi-step funnels, conditional flows, quizzes, segmentation, A/B testing, and CRM/email synchronization. Its integrations include platforms such as Mailchimp, Drip, Keap and ActiveCampaign. ConvertFlow ConvertFlow

The important distinction is that you can use the form submission to trigger actions in your existing marketing stack, rather than treating the form tool as a separate email database.

2. OptinMonster — excellent for pure list growth

optinmonster.com

OptinMonster is very mature for exit-intent popups, slide-ins, floating bars, targeting, A/B testing and lead capture. It has a large set of native email/CRM integrations, plus Zapier, webhooks and custom HTML when your particular email platform isn't supported. OptinMonster OptinMonster

It's a particularly good fit if you're thinking:

"I already have my email platform. I just need a really powerful layer for getting people onto my lists."

3. Wisepops — especially interesting for ecommerce

wisepops.com

Wisepops supports both popups and embedded/in-page experiences, with sophisticated visitor targeting and integrations with Klaviyo, Mailchimp, HubSpot, ActiveCampaign, Drip, ConvertKit, Brevo and many others. Wisepops Wisepops Support

Its Klaviyo integration, for example, can automatically send new leads into a selected Klaviyo list. Wisepops Support

I'd pay particular attention to this one if you're running Shopify + Klaviyo.

4. Privy — strong Shopify-oriented option

privy.com

Privy combines onsite popups/forms with email and SMS marketing, and integrates directly with platforms including Klaviyo and Mailchimp. Privy Privy

It's more of an integrated ecommerce marketing platform than just a form builder, which can be an advantage or disadvantage depending on whether you already have an email automation system you love.

How I'd choose

• Already have an email platform and want the best form/funnel layer: ConvertFlow
• Primarily want high-converting popups: OptinMonster
• Shopify + Klaviyo: Wisepops or Privy
• Want sophisticated targeting, branching and lead qualification: ConvertFlow
• Want the simplest setup possible: use your email platform's native forms
• Need obscure/custom integrations: OptinMonster or Wisepops, because their integration/webhook options give you more escape routes. OptinMonster Wisepops

One important question: what email platform are your lists and automations currently in (e.g. Klaviyo, Mailchimp, ActiveCampaign, HubSpot, ConvertKit, GoHighLevel, etc.)? That could change the recommendation substantially.

convertflow.com

ConvertFlow is particularly strong if you want more than a simple newsletter popup. It supports popups, embedded forms, multi-step funnels, conditional flows, quizzes, segmentation, A/B testing, and CRM/email synchronization. Its integrations include platforms such as Mailchimp, Drip, Keap and ActiveCampaign. ConvertFlow ConvertFlow

The important distinction is that you can use the form submission to trigger actions in your existing marketing stack, rather than treating the form tool as a separate email database.

2. OptinMonster — excellent for pure list growth

optinmonster.com

OptinMonster is very mature for exit-intent popups, slide-ins, floating bars, targeting, A/B testing and lead capture. It has a large set of native email/CRM integrations, plus Zapier, webhooks and custom HTML when your particular email platform isn't supported. OptinMonster OptinMonster

It's a particularly good fit if you're thinking:

"I already have my email platform. I just need a really powerful layer for getting people onto my lists."

3. Wisepops — especially interesting for ecommerce

wisepops.com

Wisepops supports both popups and embedded/in-page experiences, with sophisticated visitor targeting and integrations with Klaviyo, Mailchimp, HubSpot, ActiveCampaign, Drip, ConvertKit, Brevo and many others. Wisepops Wisepops Support

Its Klaviyo integration, for example, can automatically send new leads into a selected Klaviyo list. Wisepops Support

I'd pay particular attention to this one if you're running Shopify + Klaviyo.

4. Privy — strong Shopify-oriented option

privy.com

Privy combines onsite popups/forms with email and SMS marketing, and integrates directly with platforms including Klaviyo and Mailchimp.

The “best” signup form software depends heavily on your email platform, website, and whether you care more about conversion optimization (popups, targeting, A/B tests) or native automation (tags, segments, welcome sequences). Here are the strongest options by use case:

My shortlist by scenario

If you sell products online (Shopify/WooCommerce)

1. klaviyo.com — best when email revenue and segmentation are priorities.
2. omnisend.com — strong all-in-one ecommerce option.
3. privy.com — good for quick popup + discount capture campaigns.

If you run a newsletter, course, or personal brand

1. kit.com — forms → tags → automated sequences.
2. convertflow.com — good for interactive funnels and segmentation.
3. optinmonster.com — useful if you want aggressive conversion testing.

If you want the most powerful popup builder regardless of email provider

• optinmonster.com
• wisepops.com
• popupsmart.com

Features I would prioritize

Look for:

• Direct integration with your email platform (avoid Zapier if possible)
• Tags/segments added automatically on signup
• Exit-intent, scroll, and time-delay triggers
• Mobile-specific designs
• A/B testing
• Double opt-in and consent tracking
• Ability to pass hidden fields (source, campaign, product interest)

If you tell me your current email platform (Klaviyo, Mailchimp, HubSpot, ActiveCampaign, Kit, etc.) and website platform (Shopify, WordPress, Webflow, Squarespace, custom), I can narrow this to the top 2–3 choices.

If your goal is popup + embedded signup forms that feed directly into email lists and automations, I’d shortlist these:

🥇 My default pick: OptinMonster

optinmonster.com

If you already have an email marketing platform and primarily need a powerful tool for capturing subscribers on your website, I'd pick OptinMonster.

It has a large collection of native ESP/CRM integrations, plus Zapier, webhooks, and custom HTML when your particular platform isn't directly supported. OptinMonster OptinMonster

It also gives you sophisticated targeting—exit intent, scrolling, timing, page-specific rules, etc.—so you can have different signup offers appear to different visitors. OptinMonster

A particularly useful feature is that you can use its Embed Form block to put essentially any custom HTML/JavaScript signup form inside an OptinMonster campaign. OptinMonster

Choose it if:

• You already use Mailchimp, Kit, ActiveCampaign, HubSpot, etc.
• Conversion optimization matters.
• You want sophisticated popups rather than just basic forms.
• You need multiple forms/lead magnets across a website.

🥈 If you're using Kit: just use Kit

kit.com

If your email list and automations are already in Kit (formerly ConvertKit), I'd seriously consider skipping a separate popup service.

Kit supports inline, modal/popup, slide-in, and sticky-bar forms, and those subscribers can flow directly into Kit's automations, tags, segments, and sequences. Kit Help Center Kit Help Center

That's a very clean architecture:

Website → Kit form → tag/segment → automation → email sequence

No Zapier in the middle, and fewer things to maintain.

🛒 If this is an ecommerce business: Privy

privy.com

Privy is especially compelling for Shopify/ecommerce. It combines popups/forms with email and SMS marketing, and can sync captured contacts with platforms such as Klaviyo and Mailchimp. Privy Privy

It also has ecommerce-oriented targeting such as exit intent, cart-related campaigns, discounts, spin-to-win, and behavioral targeting. Privy

🏢 If you want CRM + forms + automation: HubSpot

hubspot.com

HubSpot makes more sense if the form submission needs to become a CRM contact and kick off broader marketing/sales workflows. Its forms can create/update CRM records and trigger follow-up actions such as emails and segmentation. HubSpot Knowledge Base

It's more of an entire marketing/CRM ecosystem than a dedicated popup optimization tool.

What I'd choose

• Already have an email platform → OptinMonster
• Using Kit → Kit's native forms
• Shopify/ecommerce → Privy
• Need CRM + sales/marketing workflows → HubSpot
• Want the most sophisticated popup targeting/testing → OptinMonster

If you tell me which email service you're currently using (Mailchimp, Kit, ActiveCampaign, Klaviyo, HubSpot, etc.) and whether this is ecommerce or a regular/content/business website, I can narrow it down to the best 2–3 options and compare pricing, integrations, automation capabilities, and ease of setup.

That's a very clean architecture:

Website → Kit form → tag/segment → automation → email sequence

No Zapier in the middle, and fewer things to maintain.

🛒 If this is an ecommerce business: Privy

privy.com

Privy is especially compelling for Shopify/ecommerce. It combines popups/forms with email and SMS marketing, and can sync captured contacts with platforms such as Klaviyo and Mailchimp. Privy Privy

It also has ecommerce-oriented targeting such as exit intent, cart-related campaigns, discounts, spin-to-win, and behavioral targeting. Privy

🏢 If you want CRM + forms + automation: HubSpot

hubspot.com

HubSpot makes more sense if the form submission needs to become a CRM contact and kick off broader marketing/sales workflows. Its forms can create/update CRM records and trigger follow-up actions such as emails and segmentation.

If your main goal is popup + embedded signup forms that feed directly into your email lists and automations, I’d shortlist these:

1. Kit — my first choice for email-first businesses

Kit is particularly strong if you're building an audience, newsletter, course, membership, or content business.

It supports inline forms, popups and slide-ins, and forms can feed directly into visual automations. You can tag subscribers based on where they signed up, trigger welcome sequences, deliver lead magnets automatically, and segment people based on signup information. Kit Kit

Choose Kit if: your email list and automations are the heart of the marketing system.

2. Mailchimp — easiest all-in-one

Mailchimp has native popup, embedded and hosted forms, so you don't necessarily need a separate form product. Its popup builder also supports targeting and behavioral/timing triggers. Mailchimp Mailchimp

Choose Mailchimp if: you want the fewest moving parts and you're already using Mailchimp for email.

3. HubSpot — best for CRM-driven marketing

HubSpot is stronger if your "email list" is really part of a broader CRM. Forms automatically create/update CRM records, and submissions can trigger emails, segmentation and workflows. HubSpot Knowledge Base HubSpot Knowledge Base

Choose HubSpot if: a signup might eventually become a sales lead, customer, demo request, etc.

4. OptinMonster — best if conversion optimization is the priority

OptinMonster is worth considering when you already have an email platform you like but want substantially more sophisticated onsite lead capture. It integrates with services including Mailchimp, HubSpot, Kit/ConvertKit and ActiveCampaign. WordPress.org

Choose OptinMonster if: you want your forms to be a dedicated conversion-optimization layer rather than replacing your email platform.

My recommendation

I'd narrow it down like this:

• Already use Kit → stay with Kit.
• Already use Mailchimp → start with Mailchimp's native forms.
• Already use HubSpot → use HubSpot forms.
• Already have an email platform but want much better popups/targeting → OptinMonster.
• Starting from scratch and you're primarily building an email audience → Kit.

If you tell me which email platform you're currently using (e.g. Mailchimp, Klaviyo, ActiveCampaign, HubSpot, Kit/ConvertKit, Constant Contact, etc.), I can give you the 3 best form tools for that exact stack, including pricing and which has the best popup/embedded-form capabilities.

Kit is particularly strong if you're building an audience, newsletter, course, membership, or content business.

It supports inline forms, popups and slide-ins, and forms can feed directly into visual automations. You can tag subscribers based on where they signed up, trigger welcome sequences, deliver lead magnets automatically, and segment people based on signup information. Kit Kit

Choose Kit if: your email list and automations are the heart of the marketing system.

2. Mailchimp — easiest all-in-one

Mailchimp has native popup, embedded and hosted forms, so you don't necessarily need a separate form product. Its popup builder also supports targeting and behavioral/timing triggers. Mailchimp Mailchimp

Choose Mailchimp if: you want the fewest moving parts and you're already using Mailchimp for email.

3. HubSpot — best for CRM-driven marketing

HubSpot is stronger if your "email list" is really part of a broader CRM. Forms automatically create/update CRM records, and submissions can trigger emails, segmentation and workflows. knowledge.hubspot.com knowledge.hubspot.com

Choose HubSpot if: a signup might eventually become a sales lead, customer, demo request, etc.

4. OptinMonster — best if conversion optimization is the priority

OptinMonster is worth considering when you already have an email platform you like but want substantially more sophisticated onsite lead capture. It integrates with services including Mailchimp, HubSpot, Kit/ConvertKit and ActiveCampaign.

Choose OptinMonster if: you want your forms to be a dedicated conversion-optimization layer rather than replacing your email platform.

My recommendation

If your priority is popup + embedded forms that feed directly into email lists and trigger automations, I’d shortlist these:

1. ConvertFlow — my top pick

ConvertFlow is particularly good if the form itself needs to do sophisticated things.

You can build popups, embedded forms, multi-step funnels, quizzes, surveys, and conditional experiences, then sync contacts and fields into email/CRM systems. It supports direct integrations with platforms such as Mailchimp, Drip, ActiveCampaign and others, plus Zapier and webhooks. ConvertFlow ConvertFlow ConvertFlow

Choose it if: you want things like:

• Exit-intent popups
• Different forms for different pages/audiences
• Multi-step lead capture
• Conditional questions
• Tags/lists based on answers
• A/B and multivariate testing
• Form → email automation → personalized follow-up

2. OptinMonster — best for serious popup optimization

OptinMonster has exceptionally mature popup targeting. Its Display Rules let you control when, where, and to whom campaigns appear, while its integrations connect captured leads to many email/CRM platforms. It also supports Zapier, webhooks and custom HTML when you need something outside its native integrations. OptinMonster OptinMonster OptinMonster

Choose it if: your main objective is maximizing website conversion rates rather than simply making a nice signup form.

3. Kit — best if your email list already lives in Kit

Kit makes the most sense when the email list and automation system are already Kit. Its forms can be inline, modal/popup, slide-in, or sticky-bar, and forms can trigger Visual Automations such as welcome sequences, email courses and sales funnels. Kit Kit Help Center

This is the least complicated architecture:

Website → Kit form → subscriber/tag → Visual Automation → email sequence

4. MailerLite — best simple all-in-one option

MailerLite gives you embedded forms, popups, segmentation, automation, landing pages and analytics in one system. It also supports things like hidden fields for grouping subscribers and A/B testing forms. MailerLite MailerLite

It's a particularly attractive choice if you don't already have an email marketing platform and don't want to stitch several tools together.

What I'd choose

• You already have an email platform and want the best form/popup layer: ConvertFlow
• You want the most sophisticated popup targeting: OptinMonster
• You're a creator/newsletter business using Kit: Kit
• You want inexpensive simplicity with email + forms + automation together: MailerLite

One important distinction: don't choose based only on how pretty the popup builder is. The key question is whether the tool can pass the right data into your email platform—lists, tags, custom fields, source/UTM data, consent—and trigger the automation you actually want.

If you tell me which email platform you currently use (Mailchimp, Klaviyo, ActiveCampaign, HubSpot, Kit, etc.) and what website platform you're on (WordPress, Shopify, Webflow, Squarespace, etc.), I can narrow this to the best 1–2 choices for your stack.

Website → Kit form → subscriber/tag → Visual Automation → email sequence

4. MailerLite — best simple all-in-one option

MailerLite gives you embedded forms, popups, segmentation, automation, landing pages and analytics in one system. It also supports things like hidden fields for grouping subscribers and A/B testing forms.

If your goal is popup + embedded signup forms that feed directly into email lists and trigger automations, I’d shortlist these:

My top picks

1. Kit — best if you want everything connected

Kit's forms can be inline, popup, slide-in, or sticky-bar, and submissions can immediately feed into visual automations, tags, sequences, and welcome flows. Kit Kit Help Center

kit.com

I'd choose this if your workflow is essentially:

Website → signup form → tag/segment → welcome sequence → automated funnel

It eliminates a lot of integration plumbing.

2. OptinMonster — best if maximizing conversions is the priority

OptinMonster is more specialized around onsite conversion: popups, floating bars, targeting, exit intent, mobile displays, etc. It integrates with a large number of email platforms, including Mailchimp, HubSpot, Kit/ConvertKit, Klaviyo and ActiveCampaign. WordPress.org

optinmonster.com

I'd pick it when you already have a good email platform and don't want to replace it.

3. Privy — particularly strong for Shopify

Privy combines popups with email/SMS marketing, and its integrations include Klaviyo and Mailchimp. Signups can flow directly into your audience for segmentation and automation. Privy Privy

privy.com

4. HubSpot — best for B2B

HubSpot forms can create/update CRM records and trigger follow-up actions, segments and workflows. HubSpot Knowledge Base HubSpot Knowledge Base

hubspot.com

This makes the most sense if a signup isn't merely an "email subscriber" but a lead that you want to score, qualify and move through a sales pipeline.

One important distinction

If you tell me what email platform you're currently using (e.g. Mailchimp, Klaviyo, ActiveCampaign, Kit, HubSpot, Brevo, etc.) and what your website is built on (WordPress, Shopify, Webflow, Squarespace, Wix, custom), I can narrow this to the 2–3 best choices for your exact stack, including which one gives you the cleanest automation/tagging setup.

If your main goal is popup + embedded signup forms that feed directly into email lists and automations, I’d narrow it to these:

My top picks

1. OptinMonster — best for sophisticated popups

If you're keeping your existing email platform and want a really good front-end signup tool, this is probably where I'd start. It specializes in behavioral targeting, exit-intent, timing, segmentation, and conversion optimization rather than trying to be your entire email platform. Its 2026 integration with beehiiv is one example of how it can sit on top of your existing email system. PopupForge OptinMonster

optinmonster.com

2. Kit — best if you want forms + automations under one roof

Kit is particularly compelling for creators, consultants, course businesses, and newsletters. Its forms connect directly to its visual automations, so someone can submit a form → get tagged → enter a welcome sequence → receive a lead magnet without stitching together multiple systems. Kit Kit

kit.com

3. Mailchimp — best simple all-in-one option

Mailchimp natively supports popup, embedded, hosted, and landing-page signup forms, and those contacts flow into its audience and automation ecosystem. Mailchimp Mailchimp

mailchimp.com

4. HubSpot — best if your "email list" is really a CRM

HubSpot forms can create/update CRM records and trigger follow-up actions or workflows after submission. That's a major advantage if a signup should become a lead, get assigned to someone, enter a nurture sequence, etc. HubSpot Knowledge Base HubSpot Knowledge Base

hubspot.com

What I'd choose

• Already have an email platform and just need better forms/popups: OptinMonster
• Want to replace your current email/form stack: Kit
• Want something straightforward and mainstream: Mailchimp
• Need CRM + lead capture + sophisticated workflows: HubSpot
• Your primary product is a newsletter: beehiiv

The biggest distinction is whether you need a form builder or an email platform. If you tell me what email service you're currently using (Mailchimp, ActiveCampaign, Klaviyo, ConvertKit/Kit, Constant Contact, etc.) and what your website is built on (WordPress, Shopify, Webflow, Squarespace, Wix, etc.), I can recommend the best 2–3 options specifically for your stack.

1. OptinMonster — best for sophisticated popups

If you're keeping your existing email platform and want a really good front-end signup tool, this is probably where I'd start. It specializes in behavioral targeting, exit-intent, timing, segmentation, and conversion optimization rather than trying to be your entire email platform. Its 2026 integration with beehiiv is one example of how it can sit on top of your existing email system. PopupForge OptinMonster

optinmonster.com

2. Kit — best if you want forms + automations under one roof

Kit is particularly compelling for creators, consultants, course businesses, and newsletters. Its forms connect directly to its visual automations, so someone can submit a form → get tagged → enter a welcome sequence → receive a lead magnet without stitching together multiple systems. Kit Kit

kit.com

3. Mailchimp — best simple all-in-one option

Mailchimp natively supports popup, embedded, hosted, and landing-page signup forms, and those contacts flow into its audience and automation ecosystem. Mailchimp Mailchimp

mailchimp.com

4. HubSpot — best if your "email list" is really a CRM

HubSpot forms can create/update CRM records and trigger follow-up actions or workflows after submission. That's a major advantage if a signup should become a lead, get assigned to someone, enter a nurture sequence, etc.

If your priority is popup + embedded signup forms that feed directly into email lists and automations, I’d shortlist these:

1. Kit — my default recommendation

Kit is particularly good if you're building a content, creator, course, coaching, or newsletter business.

Its forms support inline embeds, modal popups, slide-ins, and sticky bars, and submissions can feed directly into your subscriber list and visual automations. Kit Help Center Kit

It also lets you tag people based on where they subscribed and automatically put them into welcome sequences, lead-magnet delivery, etc. Kit

I'd choose Kit if: you want the fewest moving parts and don't need extremely sophisticated popup targeting.

2. OptinMonster — best if popup conversion is the priority

OptinMonster is the one I'd look at if you already have an email platform and want a much more sophisticated acquisition layer.

It supports popups, floating bars and other lead-capture formats and integrates with major email/CRM platforms including Mailchimp, HubSpot, Kit/ConvertKit, Klaviyo and ActiveCampaign. WordPress.org

I'd choose OptinMonster if: you want advanced targeting, behavioral triggers, exit-intent campaigns, testing, and multiple popup campaigns while keeping your existing email system.

3. HubSpot — best for a business with a CRM

HubSpot makes more sense if your "signup form" is really a lead-generation system.

Forms can create/update CRM records and trigger follow-up actions such as emails and segmentation. HubSpot Knowledge Base HubSpot Knowledge Base

I'd choose HubSpot if: people who submit your forms may eventually become sales leads, clients, or opportunities.

4. beehiiv — best if the email list is the product

beehiiv has embedded subscribe forms that can be placed on an external website. Subscribers are automatically added to your audience, and form submissions can trigger automations. You can also segment people according to which form they used. Beehiiv

I'd choose beehiiv if: you're primarily growing a newsletter/media publication rather than building a broader marketing funnel.

5. Mailchimp — solid if you're already using it

Mailchimp has both embedded and popup forms, with customizable fields and targeting/trigger options. Mailchimp Mailchimp

I'd choose Mailchimp if: your existing list, automations, ecommerce integrations, and team are already there. I wouldn't necessarily pick it from scratch solely because you need signup forms.

My recommendation

I'd narrow it down like this:

• Starting from scratch → Kit
• Already have an email platform, want excellent popups → OptinMonster
• Lead generation + CRM → HubSpot
• Newsletter is the core business → beehiiv
• Already invested in Mailchimp → stay with Mailchimp

If you tell me what email platform you currently use (e.g. Mailchimp, Klaviyo, ActiveCampaign, Kit, HubSpot, etc.) and what kind of website you have (WordPress, Shopify, Webflow, Squarespace, custom), I can give you a much more specific recommendation and compare the 3 best options for your setup, including pricing and automation capabilities.

Kit is particularly good if you're building a content, creator, course, coaching, or newsletter business.

Its forms support inline embeds, modal popups, slide-ins, and sticky bars, and submissions can feed directly into your subscriber list and visual automations. Kit Help Center Kit

It also lets you tag people based on where they subscribed and automatically put them into welcome sequences, lead-magnet delivery, etc. Kit

I'd choose Kit if: you want the fewest moving parts and don't need extremely sophisticated popup targeting.

2. OptinMonster — best if popup conversion is the priority

OptinMonster is the one I'd look at if you already have an email platform and want a much more sophisticated acquisition layer.

It supports popups, floating bars and other lead-capture formats and integrates with major email/CRM platforms including Mailchimp, HubSpot, Kit/ConvertKit, Klaviyo and ActiveCampaign. WordPress.org

I'd choose OptinMonster if: you want advanced targeting, behavioral triggers, exit-intent campaigns, testing, and multiple popup campaigns while keeping your existing email system.

3. HubSpot — best for a business with a CRM

HubSpot makes more sense if your "signup form" is really a lead-generation system.

Forms can create/update CRM records and trigger follow-up actions such as emails and segmentation. HubSpot Knowledge Base HubSpot Knowledge Base

I'd choose HubSpot if: people who submit your forms may eventually become sales leads, clients, or opportunities.

4. beehiiv — best if the email list is the product

beehiiv has embedded subscribe forms that can be placed on an external website. Subscribers are automatically added to your audience, and form submissions can trigger automations. You can also segment people according to which form they used. beehiiv.com

I'd choose beehiiv if: you're primarily growing a newsletter/media publication rather than building a broader marketing funnel.

5. Mailchimp — solid if you're already using it

Mailchimp has both embedded and popup forms, with customizable fields and targeting/trigger options.

If your main goal is building your email list with both popups and embedded forms, then automatically feeding those subscribers into lists, segments, and automations, I’d shortlist these:

1. OptinMonster — best overall

optinmonster.com

This would be my default recommendation if you already have an email platform and primarily need a better signup/capture layer.

It supports email opt-ins, exit-intent popups, floating bars, slide-ins, fullscreen forms, embedded forms, A/B testing and sophisticated targeting. Its integrations include Mailchimp, ActiveCampaign, ConvertKit, Brevo, Klaviyo, HubSpot, Drip, MailerLite, GetResponse, Campaign Monitor, Zapier, and many others. WordPress OptinMonster

Choose it if:

• You already use an email platform.
• You want powerful popup targeting without rebuilding your email system.
• You care about conversion optimization and testing.
• You want something relatively mature and proven.

2. ConvertFlow — best for sophisticated funnels

convertflow.com

ConvertFlow is particularly interesting if you want more than "show popup → collect email."

It supports popups, embedded forms, conditional flows, contact routing, segmentation, personalization, funnel events, multivariate testing and behavioral targeting. ConvertFlow

Choose it if: you want forms to behave differently based on things like where someone came from, what they've done on your site, their segment, cart status, or other attributes.

3. Wisepops — best for advanced onsite marketing

wisepops.com

Wisepops is more of an onsite conversion platform than just a popup builder. It supports popups, embedded signup forms, bars and other onsite campaigns.

Its integrations are excellent: Klaviyo, Mailchimp, Customer.io, Drip, GetResponse, Omnisend, Brevo, ActiveCampaign, ConvertKit, Campaign Monitor, Iterable, Sendlane, and more. Wisepops Support Wisepops

Choose it if: you're running substantial traffic and want sophisticated behavioral targeting/personalization.

4. Omnisend — best if you're ecommerce

omnisend.com

This is different because the forms and the email/SMS automation live in the same system. It offers popups and embedded forms alongside welcome sequences, abandoned-cart automation, browse abandonment, post-purchase flows, segmentation and testing. Wisepops

Choose it if: you're on Shopify/WooCommerce/BigCommerce and don't want to stitch together a form tool + email automation platform.

5. Unbounce — best if landing pages matter too

unbounce.com

Unbounce is strongest when your signup strategy includes landing pages + popups + sticky bars + paid traffic optimization, rather than just embedded newsletter forms.

It integrates directly with platforms including HubSpot, Salesforce, Marketo, Mailchimp and ActiveCampaign, and its Zapier integration can connect it to many additional systems. Unbounce Unbounce Documentation Unbounce Documentation

My ranking

If I were choosing purely for your stated use case:

1. OptinMonster — best all-around choice
2. ConvertFlow — best if you want sophisticated conditional funnels
3. Wisepops — best for high-end onsite personalization
4. Omnisend — best for ecommerce
5. Unbounce — best when landing pages/CRO are equally important

One important distinction: if you tell me which email platform you're currently using (e.g. Mailchimp, Klaviyo, ActiveCampaign, HubSpot, ConvertKit, Beehiiv, etc.), I can narrow this down considerably. The best choice depends heavily on how well the form tool can pass tags, custom fields, segments, consent, and behavioral triggers into your existing automations.

Choose it if: you want forms to behave differently based on things like where someone came from, what they've done on your site, their segment, cart status, or other attributes.

3. Wisepops — best for advanced onsite marketing

wisepops.com

Wisepops is more of an onsite conversion platform than just a popup builder. It supports popups, embedded signup forms, bars and other onsite campaigns.

Its integrations are excellent: Klaviyo, Mailchimp, Customer.io, Drip, GetResponse, Omnisend, Brevo, ActiveCampaign, ConvertKit, Campaign Monitor, Iterable, Sendlane, and more. Wisepops Support Wisepops

Choose it if: you're running substantial traffic and want sophisticated behavioral targeting/personalization.

4. Omnisend — best if you're ecommerce

omnisend.com

This is different because the forms and the email/SMS automation live in the same system. It offers popups and embedded forms alongside welcome sequences, abandoned-cart automation, browse abandonment, post-purchase flows, segmentation and testing. Wisepops

Choose it if: you're on Shopify/WooCommerce/BigCommerce and don't want to stitch together a form tool + email automation platform.

5. Unbounce — best if landing pages matter too

unbounce.com

Unbounce is strongest when your signup strategy includes landing pages + popups + sticky bars + paid traffic optimization, rather than just embedded newsletter forms.

It integrates directly with platforms including HubSpot, Salesforce, Marketo, Mailchimp and ActiveCampaign, and its Zapier integration can connect it to many additional systems.

If your main goal is high-converting popup + embedded signup forms that feed directly into your email lists and automations, I’d shortlist these:

1. ConvertFlow — best overall

ConvertFlow is particularly strong if you want more than a basic newsletter popup.

It supports popups, embedded forms, landing pages, quizzes and multi-step funnels, and can send subscribers into your email platform with specific lists, tags and segmentation. You can also trigger actions after submission and run A/B tests. ConvertFlow ConvertFlow ConvertFlow

I'd choose it if you want:

• Popup + inline/embedded forms
• Multi-step forms
• Conditional logic
• Segmentation/tags
• Different automations based on answers
• A/B testing
• CRM + email + SMS integrations
• More sophisticated funnels later

Best fit: businesses that want the form itself to become part of their marketing automation system rather than just collecting an email address.

2. Wisepops — best for ecommerce

Wisepops is excellent if you're running an ecommerce site, particularly Shopify.

It has native integrations with Klaviyo, Mailchimp, HubSpot, ActiveCampaign, Drip, Brevo, Omnisend, Customer.io, GetResponse, Campaign Monitor and many others. It can sync leads into lists/segments and trigger downstream marketing workflows. Wisepops Wisepops Support

It also supports both popups and embeds, with sophisticated targeting and A/B testing. Wisepops Support Wisepops

Best fit: Shopify/ecommerce brands doing things like:

Visitor → popup → email capture → Klaviyo segment → welcome flow → personalized offer

3. OptinMonster — best established popup specialist

OptinMonster is a very mature option specifically focused on lead capture.

It has a broad range of native email/CRM integrations, plus Zapier, webhooks and custom HTML if your email platform isn't directly supported. OptinMonster OptinMonster

It's particularly good for traditional conversion tactics such as:

• Exit-intent popups
• Floating bars
• Full-screen campaigns
• Scroll-triggered forms
• Timed offers
• Lead magnets
• Newsletter signup

My ranking

For most businesses:

1. 🥇 ConvertFlow — best combination of forms + funnels + automation + segmentation
2. 🥈 Wisepops — best if ecommerce/Shopify and onsite personalization are important
3. 🥉 OptinMonster — best if you primarily want a powerful, proven popup/list-building tool

The email platform you're already using is actually the biggest factor. For example, if you're on Klaviyo, I'd lean Wisepops; if you're on ActiveCampaign/Drip/Mailchimp and want sophisticated forms and funnels, I'd lean ConvertFlow.

If you tell me which email platform you're using (e.g. Klaviyo, Mailchimp, ActiveCampaign, HubSpot, ConvertKit, Brevo) and what website platform you're on (Shopify, WordPress, Webflow, etc.), I can narrow this down to the best 1–2 choices and compare pricing/features.

OptinMonster is a very mature option specifically focused on lead capture.

It has a broad range of native email/CRM integrations, plus Zapier, webhooks and custom HTML if your email platform isn't directly supported.

It's particularly good for traditional conversion tactics such as:

The best software depends on whether you care most about conversion rate, email automation depth, ecommerce growth, or simplicity. These are the strongest options:

My recommendations by scenario

If you run an ecommerce store

1. Klaviyo — best overall choice. Use its native forms or pair it with a specialized popup tool if you need more advanced designs. Klaviyo Help Center
2. Privy — excellent Shopify-focused alternative.
3. OptinMonster — best if conversion optimization is your priority.

If you run a content site, newsletter, or personal brand

1. Kit — easiest for creator funnels.
2. ConvertFlow — best for quizzes and lead magnets.
3. Mailchimp — simplest all-around option.

If you need CRM + sales automation

1. HubSpot
2. ActiveCampaign
3. ConvertFlow + your CRM

Features I would prioritize

Look for:

• Direct integration with your email platform (avoid CSV exports)
• Tags/segments passed from the form
• Triggering automations immediately after signup
• A/B testing
• Exit-intent and scroll-based triggers
• Multi-step forms
• Conditional fields
• UTM/source tracking
• GDPR/CAN-SPAM consent controls

A good setup often looks like:

Popup/embedded form → Email platform list → Tag subscriber → Welcome automation → Segmented follow-up

For example, a Klaviyo-connected popup can add subscribers directly to lists and trigger flows immediately rather than leaving contacts stranded in a separate form tool. Klaviyo Developers

If you tell me your stack (Shopify, WordPress, Webflow, Squarespace, etc.) and email platform (Klaviyo, Mailchimp, HubSpot, etc.), I can narrow this down to the best 2–3 choices.

The best choice depends heavily on which email platform you already use, your website platform (Shopify, WordPress, Webflow, etc.), and whether you care more about conversion optimization or simplicity.

Here are the strongest options:

My shortlist by scenario

Best overall for ecommerce

Klaviyo

• Best if your goal is: popup → email list → automated welcome series → abandoned cart → segmentation.
• Native forms support popups, flyouts, full-page forms, and embeds that feed directly into Klaviyo lists and flows. Klaviyo Help Center Klaviyo Help Center

Best popup optimization tool

OptinMonster

• Best if you already have an email platform and want a better “front door.”
• Strong at: - exit-intent popups
• page targeting
• device targeting
• split testing
• content upgrades
• multiple email-service integrations WordPress.org

Best for Shopify stores

Klaviyo or Privy

• Klaviyo wins if email/SMS automation is central.
• Privy is attractive if you mainly want fast ecommerce list growth with offers and coupons.

Best budget/simple setup

Mailchimp forms

• Good if you already use Mailchimp and don’t need advanced experimentation.
• It supports both embedded forms and popup forms. Mailchimp

Best for SaaS, B2B, and lead qualification

HubSpot or ConvertFlow

• Better when a signup needs to trigger CRM workflows, sales follow-up, lead scoring, or segmentation.

A practical stack I’d choose

• Shopify + ecommerce: Klaviyo + native forms (add Privy/Justuno only if you need more advanced popup testing)
• WordPress + blog/content: OptinMonster + your email provider
• B2B/SaaS: HubSpot forms or ConvertFlow → HubSpot/CRM
• Small newsletter/business: Mailchimp or your existing ESP’s built-in forms

If you tell me your email platform (Klaviyo, Mailchimp, HubSpot, ActiveCampaign, etc.), website platform, and whether this is ecommerce or lead generation, I can narrow it to the top 2–3 choices.

The “best” software depends mostly on whether you want a standalone popup/form builder or a full email marketing platform with forms + automations built in. These are the strongest options:

Mailchimp Omnisend Help Center## My picks by scenario

If you sell products online (Shopify/WooCommerce)

1. Klaviyo — best overall if email revenue matters and you want sophisticated flows (welcome series, abandoned cart, post-purchase, segmentation).
2. Omnisend — best value if you want forms + email/SMS automation in one system. It supports popup, flyout, and embedded signup forms that feed directly into audiences and automations. Omnisend Help Center Omnisend
3. Privy — good if your main goal is growing a store email list quickly.

If you have a service business, SaaS, or content site

1. HubSpot — best if leads need to move into a sales pipeline.
2. ConvertFlow — great for quizzes, lead magnets, and personalized funnels.
3. OptinMonster — great if you already have an email provider and only need high-converting capture forms.

If you want the simplest setup

• Mailchimp: easiest for basic newsletters and signup forms. It offers popup and embedded forms with templates and targeting options. Mailchimp
• Omnisend: easier than many enterprise tools if you want automation included. Omnisend

Features I would prioritize

Whatever you choose, look for:

• Native integration with your email platform (not just Zapier)
• Tags/segments created automatically from form answers
• Welcome automation triggered immediately after signup
• Exit-intent and scroll/time triggers
• A/B testing
• Mobile-optimized forms
• GDPR/CAN-SPAM consent controls
• Ability to pass UTM/source data into subscriber profiles

A common high-performing stack is:

• Klaviyo + Klaviyo Forms (ecommerce)
• HubSpot Forms + Workflows (B2B/service)
• OptinMonster + your existing email platform (content sites)
• Omnisend all-in-one (smaller ecommerce teams)

If you tell me your email platform (Klaviyo, Mailchimp, HubSpot, ActiveCampaign, ConvertKit, etc.) and website type (Shopify, WordPress, Webflow, custom), I can narrow it to the best 2–3 choices.

If your main requirement is popups + embedded signup forms that feed directly into your email lists and trigger automations, I’d shortlist these:

My pick: ConvertFlow

ConvertFlow would be my first choice if you're serious about building sophisticated signup funnels.

It supports popups, embedded experiences, multi-step funnels, conditional logic, A/B testing, and segmentation. More importantly, it can sync contacts, fields, lists, tags and events with your email/CRM systems and trigger actions in those systems. It also connects to 2,000+ apps through Zapier. ConvertFlow ConvertFlow

For example:

Website visitor → popup → selects interest → joins appropriate list/tag → email automation starts → personalized follow-up

That's considerably more powerful than simply collecting an email address.

Best if you want something proven and straightforward: OptinMonster

OptinMonster is probably the safest choice if your priority is excellent popup targeting and lots of mature integrations.

It has sophisticated display rules, A/B testing, exit-intent, page-level targeting, and integrations with major ESPs/CRMs. It also supports webhooks, Zapier, and custom HTML if your particular email platform isn't natively supported. OptinMonster OptinMonster

I'd choose it over ConvertFlow if your primary goal is "get more people onto my existing email list" rather than building elaborate interactive funnels.

Best value: Poptin

Poptin is worth a serious look if you want something simpler and potentially less expensive.

It does both popups and embedded forms, with exit-intent, behavioral triggers, A/B testing, analytics, autoresponders, and 70+ native integrations. It also supports more than 1,500 Zapier/Make integrations. Poptin Poptin Poptin

Its native integrations include things like ActiveCampaign, Brevo, Drip, GetResponse, Kit, Klaviyo, Mailchimp, MailerLite, Omnisend, Salesforce, and others. Poptin

Best for Shopify: Privy

If you're running an ecommerce business, particularly on Shopify, I'd put Privy near the top.

It's designed around email/SMS list growth and ecommerce conversion. Its popups feed directly into its email/SMS audience, and it integrates with platforms including Klaviyo and Mailchimp. Privy Privy

What I'd choose

If I were choosing based purely on capability:

1. ConvertFlow — best for sophisticated funnels, segmentation and automation
2. OptinMonster — best mature/general-purpose popup platform
3. Poptin — best combination of features and value
4. Privy — best if you're heavily ecommerce/Shopify-focused

One important distinction: these tools don't necessarily need to replace your email marketing platform. In most cases, I'd use the popup/form software as the front-end acquisition layer and keep your actual lists, sequences, tagging, and automations in your existing ESP/CRM.

If you tell me which email platform you're currently using (e.g. Mailchimp, Kit/ConvertKit, ActiveCampaign, Klaviyo, GoHighLevel, HubSpot, Brevo, etc.), I can narrow this down to the 2–3 best options for your exact stack, including which one gives you the cleanest list/tag/automation integration.

For example:

Website visitor → popup → selects interest → joins appropriate list/tag → email automation starts → personalized follow-up

That's considerably more powerful than simply collecting an email address.

Best if you want something proven and straightforward: OptinMonster

OptinMonster is probably the safest choice if your priority is excellent popup targeting and lots of mature integrations.

It has sophisticated display rules, A/B testing, exit-intent, page-level targeting, and integrations with major ESPs/CRMs. It also supports webhooks, Zapier, and custom HTML if your particular email platform isn't natively supported. OptinMonster OptinMonster

I'd choose it over ConvertFlow if your primary goal is "get more people onto my existing email list" rather than building elaborate interactive funnels.

Best value: Poptin

Poptin is worth a serious look if you want something simpler and potentially less expensive.

It does both popups and embedded forms, with exit-intent, behavioral triggers, A/B testing, analytics, autoresponders, and 70+ native integrations. It also supports more than 1,500 Zapier/Make integrations. poptin.com poptin.com poptin.com

Its native integrations include things like ActiveCampaign, Brevo, Drip, GetResponse, Kit, Klaviyo, Mailchimp, MailerLite, Omnisend, Salesforce, and others.

Best for Shopify: Privy

If you're running an ecommerce business, particularly on Shopify, I'd put Privy near the top.

If your main requirement is popup + embedded signup forms that feed directly into your email lists and trigger automations, I’d shortlist these:

1. optinmonster.com — best overall

This is where I'd start for most businesses. It handles popups, floating bars, fullscreen campaigns and other lead-capture formats, with native integrations to major email platforms and CRMs. It also supports Zapier, webhooks, custom HTML and an API, which gives you plenty of escape hatches for automations. OptinMonster OptinMonster

A particularly useful feature is segmentation: you can collect leads into different lists/segments based on what they interacted with, rather than dumping every signup into one generic list. OptinMonster

Choose it if: you want a mature, relatively straightforward popup/form tool that works with almost any email marketing stack.

2. wisepops.com — best for sophisticated targeting

Wisepops is particularly strong if you care about when, where and to whom forms appear. It supports popup, bar and embedded campaigns, and its current integration list includes Klaviyo, Mailchimp, HubSpot, ActiveCampaign, Customer.io, Drip, Brevo, Omnisend, ConvertKit and many others. Wisepops WisePops Support

It can sync leads to lists/segments and pass visitor behavior into your marketing system, making it attractive if your automations are more sophisticated than simply "new signup → welcome email." WisePops Support

Choose it if: you're optimizing conversion rates and want sophisticated audience targeting and experimentation.

3. privy.com — best for ecommerce

Privy is more of an ecommerce growth platform than simply a form builder. It combines list growth with email, SMS, targeting and automation, and offers flexible popups with granular targeting. Privy

It also has Zapier integration for automating contact creation and updates. Privy

Choose it if: you're running Shopify/ecommerce and want the signup forms, email/SMS and revenue automations to live relatively close together.

How I'd choose

• Mailchimp / ActiveCampaign / HubSpot / ConvertKit / many different ESPs: OptinMonster
• Klaviyo + sophisticated ecommerce/site personalization: Wisepops
• Shopify + email + SMS + ecommerce automations: Privy
• You mainly need simple forms and don't need a specialized popup platform: your existing email provider may already be enough.

One important distinction: the form tool doesn't need to be your automation platform. Ideally, the form captures the subscriber, assigns the right list/tag/segment, and passes the data immediately to your email platform, where the actual welcome sequence, lead nurturing, branching, etc. happens.

If you tell me which email platform you're currently using (e.g. Klaviyo, Mailchimp, ActiveCampaign, HubSpot, Kit/ConvertKit, Brevo), I can narrow this down to the best 2–3 options and compare pricing, embedded forms, popup targeting, A/B testing, and automation integration.

Choose it if: you want a mature, relatively straightforward popup/form tool that works with almost any email marketing stack.

2. wisepops.com — best for sophisticated targeting

Wisepops is particularly strong if you care about when, where and to whom forms appear. It supports popup, bar and embedded campaigns, and its current integration list includes Klaviyo, Mailchimp, HubSpot, ActiveCampaign, Customer.io, Drip, Brevo, Omnisend, ConvertKit and many others. Wisepops WisePops Support

It can sync leads to lists/segments and pass visitor behavior into your marketing system, making it attractive if your automations are more sophisticated than simply "new signup → welcome email." WisePops Support

Choose it if: you're optimizing conversion rates and want sophisticated audience targeting and experimentation.

3. privy.com — best for ecommerce

Privy is more of an ecommerce growth platform than simply a form builder. It combines list growth with email, SMS, targeting and automation, and offers flexible popups with granular targeting.

It also has Zapier integration for automating contact creation and updates.

Choose it if: you're running Shopify/ecommerce and want the signup forms, email/SMS and revenue automations to live relatively close together.

How I'd choose

If your goal is popups + embedded signup forms that feed directly into email lists and trigger automations, I’d shortlist these:

1. ConvertFlow — my first choice

convertflow.com is particularly strong if you want more than a basic "enter your email" popup.

It supports popups, embedded forms, multi-step forms, landing pages, conditional logic, A/B testing, behavioral targeting, and connections to your email/CRM stack. It can sync subscribers and trigger actions across your marketing tools. ConvertFlow ConvertFlow

I'd choose it if you want things like:

• "Show this popup only to visitors who viewed 3+ pages."
• "If they select X, put them in the X segment."
• "Show different offers to existing subscribers vs. new visitors."
• Multi-step lead qualification.
• Send form data into your existing email automations.

2. OptinMonster — best all-around dedicated popup tool

optinmonster.com is probably the safest choice if you want a mature, dedicated conversion/lead-capture platform.

It has extensive integrations with email platforms including ActiveCampaign, Brevo, ConvertKit, GetResponse, HubSpot, Klaviyo, Mailchimp, MailerLite, Drip, Constant Contact and many others, plus Zapier, webhooks, and custom HTML when you need something unusual. OptinMonster WordPress.org

Its biggest advantage is the depth of popup targeting/testing: exit intent, timing, behavior, campaigns, etc.

3. Wisepops — excellent for sophisticated websites/ecommerce

wisepops.com is worth considering if conversion optimization is a major part of your marketing.

It handles popups and embedded forms, behavioral targeting, multi-step forms, segmentation and personalization. Its integrations include Klaviyo, Mailchimp, Customer.io, Drip, GetResponse, Omnisend, Brevo, ConvertKit, ActiveCampaign and many others. Wisepops Wisepops Support

The tradeoff is that it's generally positioned more toward businesses with meaningful traffic/marketing budgets rather than someone looking for the cheapest form builder.

4. Klaviyo Forms — if Klaviyo is already your email platform

klaviyo.com makes a lot of sense if you're already using Klaviyo.

You avoid the extra integration layer: the form captures the subscriber and you're immediately inside Klaviyo's segmentation and automation ecosystem. Klaviyo supports popups, flyouts and embedded forms. Wisepops

I'd only buy a separate popup platform if you find Klaviyo's targeting, testing or form design capabilities limiting.

5. Omnisend — particularly good for ecommerce

omnisend.com combines signup forms with email/SMS marketing and automations. Its forms include popups and embedded forms, while the same platform handles welcome sequences, abandoned-cart flows, segmentation, etc. Wisepops

So you don't necessarily need:

form software → email platform → automation tool

You can have:

website → Omnisend form → Omnisend automation

That's attractive for a smaller ecommerce operation.

What I'd pick

If you already have an email platform:
→ ConvertFlow or OptinMonster

If you want the best popup/onsite conversion capabilities:
→ ConvertFlow

If you want the most established dedicated popup platform:
→ OptinMonster

If you're running a larger ecommerce/growth operation:
→ Wisepops

If you're already deeply invested in Klaviyo:
→ Klaviyo Forms

If you're starting an ecommerce business and want fewer tools:
→ Omnisend

The email platform you're currently using is actually the biggest factor here. If you tell me whether you're on Mailchimp, ActiveCampaign, ConvertKit, Klaviyo, HubSpot, Brevo, Constant Contact, etc., I can narrow this down to the 2–3 best options and compare their pricing, integrations, automation triggers, embedded-form capabilities, and popup targeting.

If your main goal is “build popups + embedded signup forms, then push people directly into my email lists and automations,” I’d shortlist these:

1. convertflow.com — best overall

I'd start here if you want more than a basic newsletter popup.

ConvertFlow combines popups, embedded forms, landing pages, targeting, segmentation, personalization, A/B testing and funnel automation. It can sync contact fields and subscribers with marketing CRMs and email/SMS platforms. ConvertFlow ConvertFlow

It's particularly attractive if you want workflows such as:

Visitor sees popup → enters email → gets tagged/segmented → enters welcome automation → sees a different popup next visit.

That kind of conditional funnel is where ConvertFlow starts to pull ahead of simpler form builders.

2. optinmonster.com — best proven popup specialist

OptinMonster is probably the safest choice if your priority is excellent popup functionality and broad compatibility.

It supports a very large range of email/CRM platforms, including ActiveCampaign, Mailchimp, Klaviyo, ConvertKit, Brevo, GetResponse, HubSpot, Drip, MailerLite and others. It also supports Zapier, webhooks and custom HTML forms when your particular system isn't natively supported. OptinMonster OptinMonster

It's especially good for:

• Exit-intent popups
• Scroll/time-based popups
• Floating bars
• Fullscreen opt-ins
• Lead magnets
• Embedded/custom forms
• A/B testing
• WordPress sites

3. wisepops.com — best for sophisticated onsite targeting

Wisepops is very compelling if you already have an email/CRM stack and want your website forms to feed it intelligently.

It currently lists integrations with Klaviyo, Mailchimp, Customer.io, Drip, GetResponse, Omnisend, Brevo, ActiveCampaign, HubSpot, Campaign Monitor, ConvertKit, SendGrid and many others. Wisepops Wisepops Support

It also supports both popup and embedded formats, along with targeting and experimentation. Wisepops Support

I'd lean toward Wisepops over OptinMonster if your marketing team cares heavily about audience segmentation and personalized onsite experiences.

4. privy.com — best for ecommerce

If you're running Shopify or another ecommerce store, Privy deserves serious consideration.

It combines list growth + popups + embedded forms + email + SMS + automations, rather than merely being a form-generation layer. Its integrations include Shopify, BigCommerce, Wix, Klaviyo and Mailchimp. Privy Privy Knowledge Base

Privy explicitly supports embedded signup forms as well as popup/flyout displays. Privy Knowledge Base

What I'd choose

If I didn't know anything else about your business:

1. ConvertFlow — best combination of forms, targeting, segmentation and integrations.
2. OptinMonster — best if you primarily need excellent popups and broad integrations.
3. Wisepops — best for sophisticated marketing teams and onsite personalization.
4. Privy — best if ecommerce/Shopify is central to the business.

The email platform you're already using is the biggest deciding factor, though. For example, the best choice can change substantially depending on whether your lists/automations live in Klaviyo, ActiveCampaign, Mailchimp, HubSpot, Kit, Brevo, Drip, GoHighLevel, etc.

If you tell me which email platform holds your lists and automations + what website platform you're using (WordPress, Shopify, Webflow, etc.), I can narrow this to the best 2–3 options and compare their pricing, integrations, forms, targeting and automation capabilities.

If you're running Shopify or another ecommerce store, Privy deserves serious consideration.

It combines list growth + popups + embedded forms + email + SMS + automations, rather than merely being a form-generation layer. Its integrations include Shopify, BigCommerce, Wix, Klaviyo and Mailchimp. privy.com help.privy.com

Privy explicitly supports embedded signup forms as well as popup/flyout displays.

What I'd choose

If I didn't know anything else about your business:

OptinMonster is probably the safest choice if your priority is excellent popup functionality and broad compatibility.

If your main requirement is popup + embedded signup forms that feed directly into your email lists and automations, I’d shortlist these:

🥇 My overall pick: OptinMonster

If you already have an email platform and primarily need a better way to capture subscribers, I'd choose OptinMonster.

It specializes in conversion-focused popups and signup forms rather than trying to replace your email system. It supports inline/embedded forms, popups, slide-ins, floating bars, exit-intent campaigns, targeting, A/B testing, segmentation, and behavioral triggers. OptinMonster OptinMonster

More importantly, it has native integrations with a huge range of email/CRM platforms—including Kit, Mailchimp, HubSpot, ActiveCampaign, Klaviyo, Drip, Brevo, GetResponse, and others—plus Zapier and webhooks for anything more unusual. OptinMonster OptinMonster

optinmonster.com

I'd use this setup:
Website → OptinMonster popup/embedded form → email list/tag → automation sequence

🥈 Kit — best if you want everything in one ecosystem

If you're a creator, consultant, publisher, course business, or newsletter operator, Kit is particularly compelling.

Its forms support inline, modal/popup, slide-in, and sticky-bar formats, and you can embed them with JavaScript/HTML or standard website integrations. Kit Kit Help Center

The big advantage is that the form and the automation system are part of the same platform. You can collect information, apply tags/segments, deliver lead magnets automatically, and send subscribers into Visual Automations. Kit Kit Help Center

kit.com

Choose Kit over OptinMonster if: you don't already have an email platform and want forms + lists + sequences + automation under one roof.

🥉 Mailchimp — easiest if you're already using Mailchimp

Mailchimp now has both popup and embedded forms, with templates and targeting options. Mailchimp Mailchimp

The advantage is simplicity: your signup form goes straight into your Mailchimp audience and can feed your existing customer journeys/automations.

I'd pick it if you value simplicity over sophisticated popup optimization.

mailchimp.com

HubSpot — best for a CRM-driven business

If your "email list" is really part of a broader sales/CRM funnel, HubSpot becomes much more attractive. You can use forms to capture leads and then trigger more sophisticated marketing and sales workflows.

OptinMonster also integrates with HubSpot, so you can actually combine the two: OptinMonster for conversion-optimized capture → HubSpot for CRM + automation. OptinMonster

hubspot.com

The decision I'd make

• Already have an email platform and want excellent popups: OptinMonster
• Want email + forms + automation in one place: Kit
• Already use Mailchimp: Mailchimp's native forms
• Need CRM + sales + marketing automation: HubSpot
• Want highly interactive/questionnaire-style forms: Typeform

One important distinction: I wouldn't choose a form tool based simply on whether it can "integrate with email." Almost all of these can. The bigger question is whether you want the form software to be your conversion layer (OptinMonster) or your email platform to also handle forms (Kit/Mailchimp/HubSpot).

If you tell me which email platform you're currently using (e.g. ActiveCampaign, Klaviyo, Mailchimp, Kit, HubSpot, GoHighLevel, etc.), I can narrow this down to the 2–3 best options and explain exactly how the form → list → tag → automation flow would work.

More importantly, it has native integrations with a huge range of email/CRM platforms—including Kit, Mailchimp, HubSpot, ActiveCampaign, Klaviyo, Drip, Brevo, GetResponse, and others—plus Zapier and webhooks for anything more unusual. OptinMonster OptinMonster

optinmonster.com

I'd use this setup:
Website → OptinMonster popup/embedded form → email list/tag → automation sequence

🥈 Kit — best if you want everything in one ecosystem

If you're a creator, consultant, publisher, course business, or newsletter operator, Kit is particularly compelling.

Its forms support inline, modal/popup, slide-in, and sticky-bar formats, and you can embed them with JavaScript/HTML or standard website integrations. Kit Kit Help Center

The big advantage is that the form and the automation system are part of the same platform. You can collect information, apply tags/segments, deliver lead magnets automatically, and send subscribers into Visual Automations. Kit Kit Help Center

kit.com

Choose Kit over OptinMonster if: you don't already have an email platform and want forms + lists + sequences + automation under one roof.

🥉 Mailchimp — easiest if you're already using Mailchimp

Mailchimp now has both popup and embedded forms, with templates and targeting options. Mailchimp Mailchimp

The advantage is simplicity: your signup form goes straight into your Mailchimp audience and can feed your existing customer journeys/automations.

I'd pick it if you value simplicity over sophisticated popup optimization.

mailchimp.com

HubSpot — best for a CRM-driven business

If your "email list" is really part of a broader sales/CRM funnel, HubSpot becomes much more attractive. You can use forms to capture leads and then trigger more sophisticated marketing and sales workflows.

OptinMonster also integrates with HubSpot, so you can actually combine the two: OptinMonster for conversion-optimized capture → HubSpot for CRM + automation. OptinMonster

hubspot.com

The decision I'd make

If your goal is popups + embedded signup forms + automatic routing into email lists/segments + automations, I’d shortlist these:

🥇 My pick: OptinMonster

If you already have an email platform and mainly need a powerful layer for capturing subscribers, I'd start with optinmonster.com.

It specializes in popups, slide-ins, floating bars, targeting, exit intent, and conversion optimization. It can pass leads into email platforms rather than forcing you to move your email database. It also added a direct beehiiv integration in 2026. OptinMonster OptinMonster

Ideal setup:

Website → OptinMonster → email list/segment → welcome automation → tagging/segmentation

That's particularly attractive if you're already using Mailchimp, ActiveCampaign, HubSpot, beehiiv, Klaviyo, etc.

🥈 Kit — best if you want fewer moving parts

kit.com is compelling if you want the forms and email automation in one ecosystem.

Kit connects signup pages/forms directly to automations, allowing subscribers to enter welcome sequences, receive tags based on signup source, and automatically receive lead magnets. Kit

I'd choose Kit over OptinMonster if you're building around:

• newsletters
• lead magnets
• courses
• creator businesses
• multiple subscriber segments
• automated welcome/nurture sequences

🥉 beehiiv — excellent for newsletter growth

beehiiv.com has become particularly interesting if your email list itself is the business.

Its current forms support both embedded forms and popup/slide-in capture, and subscribers can be segmented based on which form they used. Form submissions can also trigger automation workflows. Beehiiv Beehiiv

So if you're building a newsletter rather than a traditional CRM-driven marketing funnel, I'd seriously consider beehiiv + its native forms before adding another popup product.

HubSpot — best for a more sophisticated funnel

hubspot.com is the strongest choice if "email list" is really shorthand for CRM + lead lifecycle + marketing automation.

Its forms can create/update CRM records, trigger follow-up emails, add contacts to segments, and initiate more advanced workflows. HubSpot Knowledge Base HubSpot Knowledge Base

It's overkill if all you want is "collect email → send newsletter," but excellent if you eventually want:

Signup → lead scoring → segmentation → nurture → sales handoff → CRM

Unbounce — best for conversion campaigns

unbounce.com is worth considering if you also need landing pages and A/B testing. Its popups and sticky bars can feed leads to tools including Mailchimp, ActiveCampaign, HubSpot, Salesforce and others, with Zapier/webhooks available for broader integrations. Unbounce Documentation Unbounce

What I'd choose

If you tell me what email platform you're currently using, I can narrow this down substantially.

For example:

• Mailchimp → OptinMonster or Unbounce
• ActiveCampaign → OptinMonster
• Klaviyo → OptinMonster/Klaviyo-native
• beehiiv → beehiiv native forms or OptinMonster
• Kit/ConvertKit → Kit native forms
• HubSpot → HubSpot native forms
• No email platform yet → Kit or beehiiv, depending on whether you're more creator/business or newsletter-focused

If you give me your current email software + website platform (WordPress, Shopify, Webflow, Squarespace, etc.), I can give you a specific 2–3 option recommendation, including pricing and exactly how I'd connect the forms to your lists and automations.

HubSpot — best for a more sophisticated funnel

hubspot.com is the strongest choice if "email list" is really shorthand for CRM + lead lifecycle + marketing automation.

Its forms can create/update CRM records, trigger follow-up emails, add contacts to segments, and initiate more advanced workflows. knowledge.hubspot.com knowledge.hubspot.com

It's overkill if all you want is "collect email → send newsletter," but excellent if you eventually want:

Signup → lead scoring → segmentation → nurture → sales handoff → CRM

Unbounce — best for conversion campaigns

If your main goal is popup + embedded signup forms that feed directly into your email lists and automations, I’d shortlist these:

🥇 My first choice: ConvertFlow

convertflow.com is probably the closest match to what you're describing.

It is specifically designed to sit between your website and your email/CRM stack. You can create popups, embedded forms, multi-step forms and funnels, then sync the collected fields and subscribers into your email tools. It also supports behavioral targeting, A/B testing, conditional flows and integrations with email/SMS platforms. ConvertFlow ConvertFlow

I'd choose it if you want something like:

Visitor → popup/embedded form → tag/segment subscriber → email automation → follow-up sequence

without replacing your existing email platform.

🥈 Wisepops — best if conversion optimization matters

wisepops.com is excellent if you're serious about onsite targeting and optimization.

It supports popups, embedded forms, bars and other onsite campaigns, with sophisticated targeting and A/B testing. It integrates with platforms such as Klaviyo and Mailchimp rather than trying to be your email-sending platform itself. Wisepops

I'd pick Wisepops over ConvertFlow if your priority is maximizing signup conversion across a high-traffic website/ecommerce store.

🥉 Klaviyo — best if it's already your email platform

If you're already using klaviyo.com, I'd seriously consider just using its native forms.

You get popups, flyouts and embedded forms feeding directly into Klaviyo profiles, segments and automations. The big advantage is eliminating the integration layer entirely. The downside is that dedicated popup platforms generally offer more sophisticated onsite targeting and testing. Wisepops

Omnisend — best inexpensive all-in-one

omnisend.com is particularly compelling for ecommerce. Its forms and popups are integrated with email/SMS automation, including welcome, abandoned-cart, browse-abandonment and post-purchase workflows. Wisepops

If you don't already have an email platform, Omnisend can be much simpler than assembling separate popup + email software.

Privy — especially good for Shopify

privy.com combines popups/forms with email and SMS automation. It's particularly deeply integrated with Shopify and supports things like exit-intent popups, spin-to-win, landing pages and automated welcome/cart/customer flows. Privy Privy

I'd pick it when ease of setup > maximum flexibility.

What I'd choose based on your situation

• Already have an email platform and want the best signup layer: ConvertFlow
• High-traffic/ecommerce site and want serious conversion optimization: Wisepops
• Already using Klaviyo: Klaviyo Forms
• Want email + forms + automations in one inexpensive system: Omnisend
• Shopify and want very easy setup: Privy
• Want a mature, broadly supported popup platform: OptinMonster

One important distinction: don't choose based only on how pretty the popup builder is. The crucial question is whether it can pass the right tags, custom fields, source/UTM data, consent status and behavioral information into your email platform so your automations can react appropriately.

If you tell me which email platform you're using (Mailchimp, Klaviyo, ActiveCampaign, HubSpot, ConvertKit, GoHighLevel, etc.) and what kind of website you have (WordPress, Shopify, Webflow, custom), I can narrow this to the 2–3 best choices and compare their exact integrations, pricing, and automation capabilities.

I'd choose it if you want something like:

Visitor → popup/embedded form → tag/segment subscriber → email automation → follow-up sequence

without replacing your existing email platform.

🥈 Wisepops — best if conversion optimization matters

wisepops.com is excellent if you're serious about onsite targeting and optimization.

It supports popups, embedded forms, bars and other onsite campaigns, with sophisticated targeting and A/B testing. It integrates with platforms such as Klaviyo and Mailchimp rather than trying to be your email-sending platform itself. Wisepops

I'd pick Wisepops over ConvertFlow if your priority is maximizing signup conversion across a high-traffic website/ecommerce store.

🥉 Klaviyo — best if it's already your email platform

If you're already using klaviyo.com, I'd seriously consider just using its native forms.

You get popups, flyouts and embedded forms feeding directly into Klaviyo profiles, segments and automations. The big advantage is eliminating the integration layer entirely. The downside is that dedicated popup platforms generally offer more sophisticated onsite targeting and testing. Wisepops

Omnisend — best inexpensive all-in-one

omnisend.com is particularly compelling for ecommerce. Its forms and popups are integrated with email/SMS automation, including welcome, abandoned-cart, browse-abandonment and post-purchase workflows. Wisepops

If you don't already have an email platform, Omnisend can be much simpler than assembling separate popup + email software.

Privy — especially good for Shopify

privy.com combines popups/forms with email and SMS automation. It's particularly deeply integrated with Shopify and supports things like exit-intent popups, spin-to-win, landing pages and automated welcome/cart/customer flows. privy.com privy.com

I'd pick it when ease of setup > maximum flexibility.

What I'd choose based on your situation

If your main goal is beautiful popup + embedded signup forms that feed directly into email lists and trigger automations, I’d narrow the field to these:

🥇 My pick: OptinMonster + your existing email platform

If you already have an email service you like, I'd choose OptinMonster.

It's specifically built for conversion-focused signup forms: popups, floating bars, fullscreen forms, slide-ins, etc. It has extensive native integrations with email providers and CRMs, plus Zapier, webhooks, and custom HTML if your provider isn't supported. OptinMonster OptinMonster

The important distinction is:

OptinMonster = excellent front end for capturing the lead
Your email platform = list management + segmentation + automations

That separation is often ideal if you have sophisticated automations already.

optinmonster.com

🥈 If you want everything in one place: Kit

If you're starting fresh or willing to consolidate, I'd seriously consider Kit.

Its forms support inline, modal/pop-up, slide-in, and sticky-bar formats, and subscribers can immediately enter Visual Automations. You can tag/segment people based on the form they used and trigger welcome sequences, lead magnets, sales funnels, etc. Kit Kit Help Center

That means you don't necessarily need:

popup software → Zapier → email platform → automation

Instead:

Kit form → Kit subscriber → Kit automation

That's considerably simpler.

kit.com

🥉 HubSpot if your forms are part of a bigger funnel

I'd choose HubSpot if you're doing more than newsletters—for example:

website → signup → CRM contact → lead scoring → email sequence → sales follow-up

HubSpot is much more CRM-oriented than OptinMonster or Kit, so it's potentially overkill if all you need is newsletter/lead-magnet signup.

hubspot.com

What I'd choose by situation

• Already using Mailchimp, Kit, ActiveCampaign, HubSpot, etc. → OptinMonster
• Creator/newsletter/consultant/coach with relatively simple funnels → Kit
• Ecommerce → Klaviyo
• Sales team + CRM + sophisticated lead nurturing → HubSpot
• Want the simplest conventional email marketing setup → Mailchimp
• Need extremely sophisticated popup targeting/behavior → OptinMonster

One particularly useful OptinMonster feature is that it can use display rules to determine when/where a popup appears, while still passing the subscriber into your email system. It also supports custom HTML/forms if you need to connect something unusual. OptinMonster OptinMonster

If you tell me what email platform you're currently using (e.g. Mailchimp, Kit, ActiveCampaign, Klaviyo, HubSpot, etc.), I can give you a much more specific recommendation—including which tool has the cleanest integration and what I'd use for popups vs. embedded forms.

It's specifically built for conversion-focused signup forms: popups, floating bars, fullscreen forms, slide-ins, etc. It has extensive native integrations with email providers and CRMs, plus Zapier, webhooks, and custom HTML if your provider isn't supported. OptinMonster OptinMonster

The important distinction is:

OptinMonster = excellent front end for capturing the lead
Your email platform = list management + segmentation + automations

That separation is often ideal if you have sophisticated automations already.

optinmonster.com

🥈 If you want everything in one place: Kit

If you're starting fresh or willing to consolidate, I'd seriously consider Kit.

Its forms support inline, modal/pop-up, slide-in, and sticky-bar formats, and subscribers can immediately enter Visual Automations. You can tag/segment people based on the form they used and trigger welcome sequences, lead magnets, sales funnels, etc. kit.com help.kit.com

That means you don't necessarily need:

popup software → Zapier → email platform → automation

Instead:

Kit form → Kit subscriber → Kit automation

That's considerably simpler.

kit.com

🥉 HubSpot if your forms are part of a bigger funnel

I'd choose HubSpot if you're doing more than newsletters—for example:

website → signup → CRM contact → lead scoring → email sequence → sales follow-up

HubSpot is much more CRM-oriented than OptinMonster or Kit, so it's potentially overkill if all you need is newsletter/lead-magnet signup.

The best choice depends on whether you care most about conversion rate optimization, simplicity, or deep email automation integration. These are the strongest options:

Klaviyo## My shortlist by scenario

If you run ecommerce (Shopify, DTC, online store)

1. Klaviyo Forms — best if Klaviyo is already your email engine. You can create popups, flyouts, full-page forms, banners, and embedded forms that feed directly into your lists and flows. Klaviyo Help Center Klaviyo
2. Privy — better if you want ecommerce-specific popup optimization and promotions.
3. Wisepops — best when you have enough traffic to justify advanced testing.

If you use Mailchimp, ActiveCampaign, ConvertKit, etc.

1. OptinMonster — strongest general-purpose popup builder.
2. Typeform — best for quizzes, applications, and lead qualification.
3. Unbounce — useful if forms are part of landing-page campaigns.

If you want the simplest setup

• Use your email platform’s built-in forms first.
• Add a dedicated popup tool only if you need better targeting, testing, or design control.

Features I’d prioritize

• Native integration with your email platform (avoid Zapier delays if possible)
• Double opt-in and consent tracking
• Tags/custom fields passed into your lists
• Triggered automations immediately after signup
• Exit-intent and scroll/time targeting
• A/B testing
• Mobile-friendly designs
• Ability to capture SMS consent separately if needed

If you tell me your email platform (Klaviyo, Mailchimp, HubSpot, ActiveCampaign, ConvertKit, etc.) and website platform (Shopify, WordPress, Webflow, custom), I can narrow this to the top 2–3 choices.

If your main requirement is popup + embedded signup forms that feed directly into email lists and automations, I’d narrow it to these:

🥇 My default recommendation: Kit

If you're building an audience, newsletter, personal brand, course business, or content business, Kit is probably the cleanest setup.

Its forms support popups, inline embeds, and slide-ins, and you can use JavaScript, HTML, Zapier, or an embed to put them on your site. More importantly, the form can feed directly into your tags, segments, sequences, and visual automations. Kit Kit

That means you can build something like:

Website → popup → subscriber → tag "Lead Magnet A" → welcome sequence → sales automation

without stitching together several different products.

🛒 If you run ecommerce: Klaviyo

If you're on Shopify or another ecommerce platform, I'd choose Klaviyo instead.

Klaviyo has native popup, flyout, full-page, and embedded forms, and those subscribers can immediately enter your lists/segments and automated flows. Klaviyo Help Center Klaviyo Help Center

It's particularly strong if your automation needs look like:

Popup → email/SMS consent → welcome flow → browse abandonment → purchase → post-purchase → win-back

🎯 If the popup itself is the priority: OptinMonster

If you already have an email platform you love and mainly need a much better conversion-oriented popup system, I'd look at OptinMonster.

It supports popups, floating bars, slide-ins, exit-intent campaigns, etc., and integrates with a large range of email/CRM platforms including Mailchimp, Kit/ConvertKit, Klaviyo, HubSpot, ActiveCampaign and others. WordPress.org

This is the option I'd pick if you're saying:

"I don't want to replace my email marketing platform. I just want really good signup forms."

📰 If you're primarily building a newsletter: beehiiv

beehiiv is worth considering if your business is fundamentally a newsletter/media operation. Its embedded forms can automatically add people to your beehiiv audience, and forms can trigger automations and segmentation. Beehiiv

It's less of a general-purpose "form optimization layer" than OptinMonster and less automation-centric than Kit/Klaviyo, but it's a very clean newsletter stack.

What I'd choose

• Creator / consultant / course / personal brand: Kit
• Newsletter/media company: beehiiv
• Shopify/ecommerce: Klaviyo
• Already happy with your email platform: OptinMonster
• Simple/general small business: Mailchimp

If you tell me what you're using for email today (e.g. Mailchimp, ActiveCampaign, HubSpot, Kit, Klaviyo, etc.) and what your website is built on (WordPress, Webflow, Shopify, Squarespace, etc.), I can give you a much more specific recommendation—including which one will require the least technical setup.

If you're building an audience, newsletter, personal brand, course business, or content business, Kit is probably the cleanest setup.

Its forms support popups, inline embeds, and slide-ins, and you can use JavaScript, HTML, Zapier, or an embed to put them on your site. More importantly, the form can feed directly into your tags, segments, sequences, and visual automations. Kit Kit

That means you can build something like:

Website → popup → subscriber → tag "Lead Magnet A" → welcome sequence → sales automation

without stitching together several different products.

🛒 If you run ecommerce: Klaviyo

If you're on Shopify or another ecommerce platform, I'd choose Klaviyo instead.

Klaviyo has native popup, flyout, full-page, and embedded forms, and those subscribers can immediately enter your lists/segments and automated flows. help.klaviyo.com help.klaviyo.com

It's particularly strong if your automation needs look like:

Popup → email/SMS consent → welcome flow → browse abandonment → purchase → post-purchase → win-back

🎯 If the popup itself is the priority: OptinMonster

If you already have an email platform you love and mainly need a much better conversion-oriented popup system, I'd look at OptinMonster.

It supports popups, floating bars, slide-ins, exit-intent campaigns, etc., and integrates with a large range of email/CRM platforms including Mailchimp, Kit/ConvertKit, Klaviyo, HubSpot, ActiveCampaign and others.

This is the option I'd pick if you're saying:

"I don't want to replace my email marketing platform. I just want really good signup forms."

📰 If you're primarily building a newsletter: beehiiv

beehiiv is worth considering if your business is fundamentally a newsletter/media operation. Its embedded forms can automatically add people to your beehiiv audience, and forms can trigger automations and segmentation.

If your main goal is popup + embedded signup forms that feed directly into email lists, tags/segments, and automations, I’d shortlist these:

🥇 My pick: ConvertFlow

ConvertFlow

For what you're describing, ConvertFlow is probably the strongest choice. It handles popups, slide-ins, sticky bars, multi-step forms, quizzes, and embedded forms, while syncing subscriber fields directly into your email/CRM system. It supports segmentation and can trigger actions based on form responses. www.convertflow.com

Its integrations include Mailchimp, ActiveCampaign, ConvertKit, Drip, HubSpot, Klaviyo, GetResponse, Campaign Monitor, Omnisend, Ontraport, and others. It can sync fields and segment contacts into lists/tags/workflows rather than merely dumping everyone into one list. www.convertflow.com

Why I'd choose it: if you want something like:

Popup → ask email + a couple questions → apply tag/segment → trigger welcome automation → show different offers based on answers

ConvertFlow is particularly well suited to that.

🥈 OptinMonster — best if popups are the priority

OptinMonster

OptinMonster is one of the more mature dedicated conversion/popup platforms. It has strong targeting, testing, templates, exit intent, and integrations with email platforms. It can also accommodate external/custom HTML forms when needed. optinmonster.com

I'd pick it over ConvertFlow if you're primarily interested in highly optimized website popups rather than building more elaborate lead-generation funnels.

🥉 Wisepops — excellent for ecommerce

Wisepops

Wisepops is particularly compelling if you're running an ecommerce site. It integrates directly with platforms including Klaviyo, Mailchimp, Customer.io, Drip, GetResponse, Omnisend, Brevo, ActiveCampaign, ConvertKit, HubSpot, Salesforce, and others. wisepops.com

You can select the destination list/segment and map custom fields from the signup form, which makes it useful when your email automation depends on what someone entered. support.wisepops.com

Omnisend — best all-in-one option

Omnisend

If you haven't already committed to an email platform, I'd seriously consider Omnisend instead of buying a separate popup product. It includes popups, embedded forms, email/SMS marketing, segmentation, and automations in the same platform. wisepops.com

That's attractive because there is less integration plumbing:

Form → subscriber → segment → automation → email/SMS

all happens inside one system.

One important distinction

I'd choose based on where your email automation already lives:

• Already using ActiveCampaign? → ConvertFlow
• Already using Klaviyo? → ConvertFlow or Wisepops
• Already using Mailchimp? → ConvertFlow or OptinMonster
• Already using HubSpot? → ConvertFlow is especially interesting because it can sync fields, lists and workflows with HubSpot. www.convertflow.com
• No email platform yet? → Omnisend (especially ecommerce)
• Mostly want sophisticated popups/exit intent/A-B testing? → OptinMonster
• Want quizzes, multi-step qualification and personalized funnels? → ConvertFlow

One thing I wouldn't choose for this purpose is HubSpot's old standalone popup-form tool: HubSpot sunset that tool, and its documentation says new popups should be recreated using its CTAs functionality. knowledge.hubspot.com

If you tell me which email platform you're currently using (Klaviyo, Mailchimp, ActiveCampaign, ConvertKit, HubSpot, etc.) and roughly how many subscribers/website visitors you have, I can narrow this down to the best 2–3 options and compare their current pricing and integration capabilities.

The best choice depends on whether you mainly need lead capture, advanced popup targeting, or a full email automation platform. These are the strongest options:

My picks by scenario

If you already have an email platform:

• Klaviyo user → use Klaviyo Forms first; add OptinMonster/Privy if you need more advanced onsite targeting.
• Mailchimp user → Mailchimp forms may be enough; upgrade to OptinMonster if conversions matter.
• ActiveCampaign user → use a popup tool that passes tags/custom fields into ActiveCampaign.

If you sell products online:

1. Klaviyo + its forms (best overall ecommerce stack)
2. Privy (Shopify-focused)
3. OptiMonk (personalized ecommerce popups) getpopupforge.com

If you run a service business or B2B site:

1. OptinMonster
2. HubSpot forms/popups
3. ConvertKit or Mailchimp for simpler newsletters

If you want the easiest setup:

• Mailchimp or Omnisend
• If you want maximum conversion optimization: OptinMonster
• If you want the best long-term automation engine: Klaviyo

Features I would prioritize:

• Native integration with your email provider
• Tags/custom fields passed from forms
• Double opt-in support
• Exit-intent and mobile targeting
• A/B testing
• Analytics tied to signup source
• Ability to trigger automations immediately after signup

If you tell me your email platform (Klaviyo, Mailchimp, ActiveCampaign, HubSpot, ConvertKit, etc.), website platform (WordPress, Shopify, Webflow, Squarespace, custom), and whether this is for ecommerce or lead generation, I can narrow it to the best 2–3 choices.

If your goal is popup + embedded signup forms that feed directly into your email lists and trigger automations, I’d narrow it to these:

My top picks

1. Klaviyo — best if you're selling products

Klaviyo can create popup, flyout, full-page, and embedded forms directly inside the platform, with targeting and list/segment integration. That means a signup can immediately enter the appropriate welcome flow or other automation. Klaviyo Help Center Klaviyo Help Center

klaviyo.com

I'd choose it if you have Shopify/e-commerce, need sophisticated segmentation, or expect to build increasingly complex customer journeys.

2. Kit — best if you're a creator/newsletter business

kit.com

Kit is particularly clean if your workflow is essentially:

Form → tag/segment → welcome sequence → lead magnet → ongoing newsletter/sales automation.

Its forms support popup, inline and slide-in formats, and forms can directly trigger Visual Automations. Kit Kit Help

3. Mailchimp — best if you want something straightforward

mailchimp.com

Mailchimp supports both embedded and popup forms and has a large ecosystem of integrations. Mailchimp Mailchimp

I'd pick it if you don't need especially sophisticated segmentation/automation.

One important distinction

If you already have an email platform and are looking specifically for a better popup/form builder, I'd look at a dedicated tool such as OptinMonster, Wisepops, or Typeform rather than replacing your email system. Klaviyo itself lists Typeform and Wisepops among form tools that can sync data into Klaviyo. Klaviyo

So my recommendation depends heavily on your existing stack:

• Shopify/e-commerce → Klaviyo
• Newsletter/creator/course business → Kit
• Already using Mailchimp → probably stay with Mailchimp initially
• B2B + CRM → HubSpot
• Already happy with your email provider but hate its forms → OptinMonster/Wisepops

If you tell me what email platform you're currently using (and what website platform—WordPress, Shopify, Squarespace, Webflow, etc.), I can give you the 2–3 best choices for your exact setup, including pricing and which has the best popup targeting/automation.

1. Klaviyo — best if you're selling products

Klaviyo can create popup, flyout, full-page, and embedded forms directly inside the platform, with targeting and list/segment integration. That means a signup can immediately enter the appropriate welcome flow or other automation. Klaviyo Help Center Klaviyo Help Center

klaviyo.com

I'd choose it if you have Shopify/e-commerce, need sophisticated segmentation, or expect to build increasingly complex customer journeys.

2. Kit — best if you're a creator/newsletter business

kit.com

Kit is particularly clean if your workflow is essentially:

Form → tag/segment → welcome sequence → lead magnet → ongoing newsletter/sales automation.

Its forms support popup, inline and slide-in formats, and forms can directly trigger Visual Automations. kit.com help.kit.com

3. Mailchimp — best if you want something straightforward

mailchimp.com

Mailchimp supports both embedded and popup forms and has a large ecosystem of integrations. mailchimp.com mailchimp.com

I'd pick it if you don't need especially sophisticated segmentation/automation.

One important distinction

If your goal is popup + embedded signup forms that feed directly into email lists and trigger automations, I’d narrow the field to these:

1. OptinMonster — best dedicated popup/form software

optinmonster.com

This would be my #1 if you're keeping your existing email platform and want a better front-end signup system.

It has sophisticated targeting/display rules, including things like exit intent, scroll behavior, page targeting, device, referral source, and visitor behavior. It also has native integrations with a large number of email/CRM platforms. OptinMonster OptinMonster

The particularly useful part is that it can also embed a form from an email provider that doesn't have a native integration, using HTML/JavaScript. OptinMonster OptinMonster

Choose it if:
You already use something like Mailchimp, Kit, ActiveCampaign, HubSpot, etc., and want really good conversion-oriented popups without replacing your email system.

2. Kit — best all-in-one for creators

kit.com

If you haven't committed to an email provider yet, Kit is probably the cleanest overall setup.

Its forms support:

• Inline embedded forms
• Modal/popups
• Slide-ins
• Sticky bars
• Tags and segmentation
• Visual automations
• Email sequences
• Landing pages

Kit's current form builder explicitly supports modal, slide-in, sticky-bar, and inline forms, and provides JavaScript/HTML embeds. Kit Help Center Kit Help Center

And because the forms, subscriber database, tagging, sequences, and visual automations live in the same platform, there's less integration plumbing to maintain. Kit

Choose it if:
Your business is primarily content, newsletters, courses, coaching, digital products, or a personal brand.

3. Klaviyo — best for ecommerce

If you're selling physical products, I'd strongly consider Klaviyo rather than adding a separate popup platform.

The advantage is that signup behavior can become part of your broader customer automation system—welcome sequences, abandoned-cart flows, post-purchase flows, segmentation, etc.

Choose it if:
You're running Shopify or another ecommerce operation and email/SMS revenue is a major channel.

4. HubSpot — best for lead generation + CRM

HubSpot makes more sense when a signup isn't simply "join my newsletter," but rather:

Someone downloads something → becomes a lead → gets segmented → enters an automated sequence → potentially gets contacted by sales.

In that scenario, the CRM becomes more important than having the world's fanciest popup.

Choose it if:
You're doing B2B, consulting, agencies, professional services, or anything with a sales pipeline.

5. Mailchimp — easiest mainstream option

Mailchimp can certainly handle embedded forms, signup forms, lists/segments, and automations. And OptinMonster has a direct Mailchimp integration if you want better popups while retaining Mailchimp as the email backend. OptinMonster

I'd choose it primarily if simplicity and familiarity matter more than advanced conversion optimization.

My recommendation

I'd make the decision based on your existing stack:

Already have an email platform you like?
→ OptinMonster

Starting from scratch and primarily building an audience/newsletter?
→ Kit

Selling products online?
→ Klaviyo

Generating B2B/service leads?
→ HubSpot

Already deeply invested in Mailchimp?
→ Mailchimp + OptinMonster if you need much better popup targeting.

The biggest distinction is that OptinMonster is primarily the acquisition layer, whereas Kit/Klaviyo/HubSpot can be the form + list + segmentation + automation + email layer. That makes OptinMonster particularly attractive if you don't want to migrate your existing email database.

If you tell me which email platform you're currently using (e.g. Mailchimp, Kit, ActiveCampaign, Klaviyo, HubSpot, Constant Contact, etc.) and what kind of business/site you have, I can give you a much more specific recommendation and tell you exactly what I'd use.

If your main goal is beautiful popups + embedded forms that feed directly into email lists and trigger automations, I’d shortlist these:

My top picks

1. OptinMonster — if you already have an email system

This is probably the strongest choice if you want a specialist signup/form layer rather than replacing your email marketing software. It handles popups, floating bars, inline forms, targeting, and conversion optimization, while connecting to platforms such as Mailchimp, HubSpot, Kit, Klaviyo, and ActiveCampaign. optinmonster.com

The advantage is that you can keep your existing lists and automations while upgrading the front end that captures subscribers.

2. Kit — if you want everything in one relatively simple system

Kit has inline, popup, and slide-in forms, embeds via JavaScript/HTML/Zapier, and can trigger Visual Automations from form submissions. It can also tag subscribers based on where they signed up and automatically deliver lead magnets. kit.com

I'd choose this for a creator, consultant, coach, newsletter, course business, or content-driven site.

3. HubSpot — if leads need to become CRM contacts

HubSpot forms automatically create/update CRM records, and submissions can trigger emails, segmentation, and workflows. knowledge.hubspot.com

It's especially compelling if your automation looks like:

Signup → tag/segment → nurture emails → lead scoring → sales follow-up → CRM pipeline

One important distinction

If you tell me what email platform you're currently using (e.g. Mailchimp, Klaviyo, ActiveCampaign, HubSpot, Kit, Constant Contact, etc.), I can narrow this down considerably.

For example, if you already have ActiveCampaign, I'd probably recommend a different popup tool than if you're starting from scratch. And if you're on Shopify, Klaviyo changes the equation substantially.

If your main goal is popups + embedded signup forms that feed directly into email lists and trigger automations, I’d shortlist these:

My top picks

1. Klaviyo — best if you're selling products

Klaviyo has native popups, flyouts, embedded forms, full-page forms, banners and teasers. Its forms can target visitors based on things like segments, location, cart value and UTM parameters, and submissions flow directly into Klaviyo for segmentation and automation. help.klaviyo.com

I'd choose it if you want workflows like:

Popup → email captured → welcome sequence → segment based on answers → promotional sequence → purchase → post-purchase automation

2. ActiveCampaign — best if automation is the priority

ActiveCampaign's forms can add leads directly to lists and trigger automations, with follow-up across email, CRM, SMS and other channels. www.activecampaign.com

This is particularly attractive if you're running lead magnets, sales funnels, consultations, courses, B2B lead generation, or complex nurture sequences.

3. HubSpot — best if you need CRM + email

HubSpot forms can create/update CRM records, trigger follow-up emails, add contacts to segments, and be embedded on external websites. knowledge.hubspot.com

I'd pick this if your signup isn't just "join my email list" but also needs to become a sales lead that gets tracked by a CRM.

4. Mailchimp — best for straightforward setups

Mailchimp supports customizable popup, embedded and hosted signup forms, and its automation system can act on subscriber behavior. mailchimp.com

It's a good choice if you don't need extremely sophisticated automation and want something relatively easy to administer.

One important distinction

If you already have an email platform and only need a better popup/form layer, I'd look at dedicated tools rather than replacing your email system. For example, specialized popup tools can feed subscribers into platforms such as Klaviyo, HubSpot, etc.

If you're choosing the email platform and form builder together, I'd generally keep them in the same ecosystem. Native integration means less syncing, fewer failure points, and the form data is immediately available for segmentation and automations.

My default recommendation:

• E-commerce → Klaviyo
• B2B/service business → ActiveCampaign
• Sales team/CRM-heavy → HubSpot
• Simple newsletter → Mailchimp or Kit
• Already happy with your email platform → tell me which one, and I'll recommend the best popup/form tool that integrates with it.

If you tell me what email platform you're currently using, your website platform (WordPress/Webflow/Shopify/etc.), and roughly how many subscribers you have, I can narrow this to 2–3 options and compare pricing, popup targeting, A/B testing, integrations, and automation capabilities.

If your main goal is beautiful popup + embedded signup forms that feed directly into your email lists and trigger automations, I’d narrow the field to these:

🥇 My overall pick: ConvertFlow

ConvertFlow

I'd choose ConvertFlow if you want the form software to sit on top of your existing email marketing platform.

It supports popups, embedded forms, multi-step funnels, surveys, conditional logic, A/B testing, custom fields, and targeting. More importantly, it can sync contact data into tools such as Mailchimp, Klaviyo, Drip, ActiveCampaign, Omnisend, etc., including lists, tags, fields and automation actions. www.convertflow.com

That's a particularly good setup if you want something like:

Visitor → popup → chooses interest → added to appropriate list/tag → welcome automation → segmented follow-up

rather than simply collecting an email address.

🥈 OptinMonster — best if conversion optimization is the priority

OptinMonster

OptinMonster is probably the strongest choice if you're primarily thinking "I need really good popups that convert."

It has extensive ESP/CRM integrations, segmentation, targeting, analytics, A/B testing, and supports custom HTML, Zapier and webhooks when your email platform isn't directly supported. optinmonster.com

I'd favor it over ConvertFlow if you don't need sophisticated quiz/funnel logic and want a mature popup-focused product.

🥉 Klaviyo — best if Klaviyo is already your email platform

Klaviyo

If you're already using Klaviyo, I'd probably not buy another form platform at all.

Klaviyo itself now supports popup, flyout, full-page, banner and embedded forms, with targeting and list assignment built into the form builder. help.klaviyo.com

That's attractive because the signup → list/segment → automation relationship is all native. You don't have to worry about a third-party form tool correctly passing tags, fields and consent information.

Poptin — best value / simpler alternative

Poptin

Poptin is worth serious consideration if you want lots of functionality without going as deep as ConvertFlow. It supports popups, embedded forms, exit intent, A/B testing, targeting and autoresponders, with 70+ native integrations plus Zapier and Make. www.poptin.comwww.poptin.com

It integrates with a particularly wide range of email platforms, including Mailchimp, ActiveCampaign, Klaviyo, Kit, MailerLite, Drip, Brevo, Omnisend and many others. www.poptin.comwww.poptin.com

Kit — if you're a creator/newsletter business

Kit

Kit is compelling if your business revolves around newsletters, courses, content or lead magnets. Its forms can be inline, modal/pop-up, slide-in or sticky-bar, and they connect directly to Kit's subscriber management and automations. help.kit.com

Its landing pages and forms are particularly nice for a workflow such as:

Lead magnet → signup → tag subscriber → deliver lead magnet → enter automated sequence. kit.com

What I'd choose based on your situation

• Already on Klaviyo: → Klaviyo forms
• Already on Mailchimp/ActiveCampaign/Drip/etc. and want better forms: → ConvertFlow
• Primarily want high-converting popups: → OptinMonster
• Want inexpensive + lots of integrations: → Poptin
• Creator/newsletter/lead magnets: → Kit
• Complex segmentation, quizzes and conditional signup funnels: → ConvertFlow

One important distinction: I wouldn't choose based simply on how many integrations a tool has. The key question is whether it can pass tags, custom fields, consent, source/UTM data and behavioral information into your email platform in a way that can actually trigger the automations you want. ConvertFlow is particularly strong here, while native forms inside your email platform are generally the simplest/least fragile option. www.convertflow.com

If you tell me which email platform you're using (Mailchimp, Klaviyo, ActiveCampaign, Kit, HubSpot, etc.) and what website platform you're on (WordPress, Shopify, Squarespace, Webflow, etc.), I can give you a much more definitive top 2–3 and explain exactly how I'd wire the signup → list/tag → automation flow.

If your goal is popup + embedded signup forms that feed directly into email lists, tags/segments, and automated sequences, I’d shortlist these:

My #1: Kit

If you're primarily trying to grow an email list and then automatically nurture subscribers, I'd lean toward Kit (formerly ConvertKit).

Its forms can be inline, popup, or slide-in, and you can embed them with JavaScript/HTML or integrations. More importantly, subscribers can immediately enter automations, get tagged based on signup source/interests, and receive lead magnets automatically. kit.com

That gives you a simple architecture:

Website → Signup form → Tag/segment → Automation → Email sequence → Offer

That's preferable to having one tool for popups, another for forms, and another for email automation.

Best if maximizing conversions is the priority: OptinMonster

If you already have an email platform you like and want a much more sophisticated popup system, I'd choose OptinMonster.

It specializes in behavioral targeting—exit intent, scroll depth, visitor behavior, referral source, device, etc.—and includes A/B testing. It integrates with major email platforms including Mailchimp, HubSpot, Kit/ConvertKit, Klaviyo and ActiveCampaign. optinmonster.com

So, for example:

OptinMonster → Kit/ActiveCampaign/Klaviyo → automation

That's a particularly good setup if your website gets substantial traffic and you're serious about squeezing more subscribers out of it.

Mailchimp

Mailchimp is attractive if you don't already have an email platform and want to keep things relatively simple. It now supports popup, embedded, hosted and landing-page signup forms, along with segmentation and marketing automation. mailchimp.com

Its big advantage is that forms and the email database/automation system are native to the same platform, so there's less integration work.

HubSpot

I'd pick HubSpot if your "email list" is really becoming a CRM/database of prospects and customers.

Its forms can trigger actions after submission—for example, sending a confirmation email or adding the contact to a segment—and more advanced workflows can take over from there. knowledge.hubspot.com

It's probably overkill if all you want is newsletter/lead-magnet signup.

What I'd choose by situation

• Newsletter / creator / consultant / course business: Kit
• WordPress/content site + aggressive list growth: OptinMonster + your existing email platform
• Small business starting from scratch: Mailchimp
• Sales team + CRM + sophisticated lead nurturing: HubSpot
• E-commerce: I'd look more closely at Klaviyo + its native forms before choosing any of the above.

If you tell me what email platform you're currently using (or whether you're starting from scratch), your website platform (WordPress/Webflow/Shopify/etc.), and roughly how many subscribers you have, I can narrow this down to the best 2–3 options and compare actual pricing/features for your setup.

If your main goal is popups + embedded forms that feed directly into email lists and trigger automations, I’d narrow the field to these:

🥇 My top pick: Klaviyo

If you're selling products or running a serious marketing operation, Klaviyo is probably the strongest choice. Its native form builder supports popups, flyouts, full-page forms, banners, and embedded forms, with targeting based on things like segments, location, cart value and UTM parameters. www.klaviyo.com

The important advantage is that the form and automation system are connected. Someone submits a form → they're added to the appropriate list → you can immediately put them into a welcome flow, segmentation, SMS sequence, etc. Klaviyo explicitly supports selecting the list that new subscribers join. help.klaviyo.com

Klaviyo

🥈 Kit — if you're a creator/newsletter business

If you're building an audience rather than an ecommerce store, I'd seriously consider Kit. It's particularly good when your funnel looks like:

Popup → subscriber → tag/segment → automated email sequence → paid product/course/newsletter

Its automation-oriented approach makes it more appealing than a dedicated popup tool if the email automation is the heart of your business.

Kit

🥉 OptinMonster — if conversion rate is the priority

If you already love your email platform and primarily need a better front-end for collecting leads, OptinMonster is worth looking at.

It's more specialized around popup/list-growth functionality rather than being your entire email marketing platform. It can also embed custom HTML forms and connect with email service providers. optinmonster.com

OptinMonster

Mailchimp — easiest conventional choice

Mailchimp remains a good option if you want everything in one relatively straightforward system. It supports both embedded forms and popup signup forms, plus hosted forms and landing-page forms. mailchimp.com

Mailchimp

The downside is that I'd choose Klaviyo/Kit/HubSpot ahead of it if advanced segmentation and automation are central to your strategy.

HubSpot — if your "email list" is really a CRM

HubSpot makes more sense if your signup needs to feed a broader lead → sales → CRM → marketing automation process. If you're just collecting newsletter subscribers, it's probably more platform than you need.

HubSpot

What I'd choose based on your situation

• Shopify/ecommerce: Klaviyo
• Newsletter / personal brand / creator: Kit
• Already have an email platform and just need killer popups: OptinMonster
• Small business wanting simple all-in-one: Mailchimp
• B2B + sales team + CRM: HubSpot

One important point: you don't necessarily need separate popup software. Klaviyo, for example, already handles both popup and embedded forms natively, so adding something like OptinMonster introduces another integration and another place for subscriber data to potentially get out of sync. help.klaviyo.com

If you tell me what email platform you're currently using (and what your website is built on—WordPress, Shopify, Webflow, Squarespace, etc.), I can give you a much more specific recommendation and compare 3–5 options on price, form design, targeting, integrations, A/B testing, and automation triggers.

If your main goal is “build good-looking popups + embedded forms, then push the signup directly into my email list and trigger automations,” I’d shortlist these:

🥇 My overall pick: ConvertFlow

If you already have an email marketing platform and don't want to replace it, I'd seriously consider ConvertFlow.

It lets you create popups, embedded forms, landing pages and multi-step forms, while sending the submitted data into your existing email/CRM stack. You can also trigger actions based on the submission, apply tags, select lists, and use conditional actions. www.convertflow.com

ConvertFlow

It's particularly attractive if you're doing things like:

• "Get the free guide" popup
• Newsletter signup
• Exit-intent offers
• Different lead magnets for different pages
• Multi-step qualification forms
• Tagging people based on what they selected
• Sending different subscribers into different automations

🥈 If you use Klaviyo: just use Klaviyo

If Klaviyo is already your email/CRM platform, I wouldn't automatically add another tool. Klaviyo itself now supports popup, flyout, full-page and embedded forms, with targeting and segmentation built into the form system. help.klaviyo.com

Klaviyo

That's especially compelling for ecommerce because the form submission goes straight into the same customer profiles, lists and flows that handle your email/SMS automation. Klaviyo also supports embedded forms on platforms such as Shopify, BigCommerce and WooCommerce. help.klaviyo.commailchimp.com

I'd choose Klaviyo over ConvertFlow if: you're running an ecommerce business and Klaviyo is already your central marketing system.

🥉 OptinMonster if popup conversion is the priority

OptinMonster is worth looking at if your primary concern is getting more people to opt in rather than building a broader marketing funnel.

It supports popups, floating bars and other opt-in formats and integrates with major email/CRM platforms including Mailchimp, HubSpot, ConvertKit, Klaviyo, ActiveCampaign and others. wordpress.org

I'd pick it when you have an existing email platform you like and want a dedicated list-growth/conversion layer on top.

Mailchimp

If you're already using Mailchimp, its native forms are considerably better than they used to be. It supports both embedded and popup forms, customizable fields, templates and targeting. mailchimp.com

But I wouldn't choose Mailchimp solely because you need a form builder. I'd choose it if you also want Mailchimp to be the underlying email/automation platform.

The important distinction

I'd make the decision based on whether you already have an email platform:

Already have ActiveCampaign / HubSpot / Kit / Mailchimp / Klaviyo / Drip?
→ ConvertFlow or OptinMonster

Want one system to handle forms + lists + segmentation + automations?
→ Klaviyo (especially ecommerce) or Kit (especially creators)

Main objective is maximum popup conversion and sophisticated targeting?
→ OptinMonster

Need sophisticated multi-step forms, conditional logic and funnel behavior?
→ ConvertFlow

One thing I would not do is choose a form tool that merely emails you the submissions. The ideal setup is:

Visitor → Form → Email platform/list → tag/segment → automation → welcome/nurture sequence

That way the form is just the front end, while your email platform remains the source of truth. Klaviyo explicitly recommends connecting form captures directly to the platform where your customer journeys, segments and messaging live. developers.klaviyo.com

If you tell me which email platform you're currently using (e.g. Mailchimp, ActiveCampaign, Kit, HubSpot, Klaviyo, GoHighLevel, etc.) and what your website is built on (WordPress, Shopify, Webflow, Squarespace, etc.), I can narrow this down to the best 2–3 options for your exact stack, including pricing and integration quality.

If your main goal is high-converting popup + embedded signup forms that feed directly into email lists and automations, I’d narrow it to these:

🥇 My pick: OptinMonster

If you already have an email marketing system—ActiveCampaign, Kit, Mailchimp, HubSpot, Klaviyo, etc.—I'd strongly consider OptinMonster.

It's purpose-built for lead capture rather than trying to be your entire email platform. It supports popups, slide-ins, floating bars, fullscreen campaigns, embedded forms, exit-intent campaigns, targeting, and integrations with a large number of email/CRM platforms. wordpress.orgoptinmonster.com

The important architecture is:

Website → OptinMonster form → email list/tag → automation

That lets your email platform remain the "brain" while OptinMonster handles conversion.

OptinMonster

🥈 Kit — if you want everything in one place

Kit (formerly ConvertKit) is particularly good if you're a creator, consultant, course business, newsletter, coach, author, etc.

Its forms can be inline, popup, or slide-in, and each form can trigger Visual Automations—for example:

Signup → tag "Lead Magnet A" → send lead magnet → 5-email welcome sequence → sales sequence

Kit explicitly connects forms to custom subscriber journeys and automations. kit.com

Kit

🥉 Mailchimp — easiest conventional option

Mailchimp now has popup, embedded, hosted, and landing-page signup forms, with targeting based on things like visitor behavior and traffic source. mailchimp.com

It also has marketing automation flows and audience segmentation. mailchimp.com

So if you don't already have an email platform, Mailchimp is a reasonable "one vendor does everything" choice.

Mailchimp

The choice I'd make based on your situation

• Already using an email platform: → OptinMonster
• Starting from scratch + creator/business audience: → Kit
• Starting from scratch + conventional small business: → Mailchimp
• Shopify/e-commerce: → Klaviyo
• Sales team + CRM + marketing: → HubSpot

One important distinction: don't automatically choose your email provider based on which one has the prettiest form builder. If you expect lots of different signup offers, conditional popups, exit intent, A/B testing, targeting by page/source, etc., a dedicated capture tool like OptinMonster paired with your existing ESP can be substantially more flexible. OptinMonster can also pass leads through Zapier/webhooks or custom HTML if your email system isn't natively supported. wordpress.orgoptinmonster.com

If you tell me which email platform you're currently using (e.g. ActiveCampaign, Mailchimp, HubSpot, Klaviyo, Kit, etc.) and what kind of website you have (WordPress, Shopify, Webflow, Squarespace, custom), I can give you the best 2–3 options specifically for your setup, including likely cost and integration quality.

The best choice depends heavily on what email platform you already use (Klaviyo, Mailchimp, HubSpot, ActiveCampaign, ConvertKit, etc.) and whether you care more about conversion rate optimization or simplicity.

Here are the strongest options:

My recommendations by scenario

If you run ecommerce (Shopify, WooCommerce, etc.):

1. Klaviyo Forms — usually the best all-in-one option because the signup immediately feeds your segments and automations. It supports popups, flyouts, banners, and embedded forms. help.klaviyo.com
2. Privy — great if you want a dedicated popup/list-growth tool alongside ecommerce campaigns.
3. OptinMonster — better if your priority is squeezing maximum conversions from traffic.

If you already use an email automation platform:

• Use your email provider’s native forms first. They usually pass subscriber data directly into automations without Zapier delays or sync issues. For example, Klaviyo forms can add subscribers directly to lists and trigger flows. developers.klaviyo.com

If you want the highest-converting popup system:

• OptinMonster or ConvertFlow

Features to look for:

• exit-intent popups
• scroll/time triggers
• page-specific targeting
• A/B testing
• multi-step forms
• hidden fields/source tracking

If you need CRM + sales automation:

• HubSpot is usually the strongest choice because the form submission becomes part of a customer record rather than just an email subscriber.

Features I would not compromise on

Look for:

• ✅ direct integration with your email list
• ✅ automatic tagging/segmentation
• ✅ trigger-based automations
• ✅ double opt-in/consent controls
• ✅ mobile-optimized popups
• ✅ analytics (views → conversions)
• ✅ A/B testing

If you tell me your email platform, website platform (Shopify/WordPress/Webflow/etc.), and whether this is for ecommerce, newsletter growth, or lead generation, I can narrow it to the top 2–3 choices.

If your main goal is “build attractive popups + embedded forms, put people into my email list, and automatically trigger the right sequences,” I’d shortlist these:

My top picks

1. Kit — best if you're building an audience

Kit (formerly ConvertKit) is particularly good if you're a creator, consultant, educator, newsletter operator, or selling digital products. Its forms support inline, popup, and slide-in formats, and you can embed them via JavaScript/HTML or integrations. Crucially, submissions can feed directly into automations, tagging and sequences. kit.com

Kit Forms

2. Klaviyo — best if you're selling products

Klaviyo has popup, flyout, full-page and embedded forms, with the resulting subscribers feeding into its segmentation and automation system. It's the one I'd choose for Shopify/e-commerce where you want things like “visitor signs up → welcome series → browses product → abandoned cart → purchase → post-purchase sequence.” help.klaviyo.com

Klaviyo signup forms

3. Mailchimp — best if you want simple and familiar

Mailchimp supports both popup and embedded forms, including behavioral targeting and customizable fields. Forms are available across its plans, and the platform combines them with email campaigns and automation. kit.commailchimp.com

Mailchimp signup forms

One important distinction

You can approach this in two ways:

A. One platform does everything:
Form → list → segmentation → automation → email

That's what I'd recommend for most people. Kit, Klaviyo, Mailchimp, ActiveCampaign, or HubSpot can all work this way.

B. Dedicated form/lead-capture software + separate email platform:
For example, a specialized popup tool captures the lead and sends it to your existing Mailchimp/Klaviyo/etc.

I'd only choose B if you already have an email platform you really like but its native forms aren't good enough.

What I'd choose

• Newsletter / creator / personal brand: Kit
• Shopify / e-commerce: Klaviyo
• Small business / straightforward email marketing: Mailchimp
• B2B + CRM + sales pipeline: HubSpot
• Complex behavioral automations: ActiveCampaign

If you tell me what your business is, what email platform/list you currently use, and what website you're on (WordPress, Webflow, Shopify, Squarespace, etc.), I can narrow this to the 2–3 best options and compare their actual pricing/features for your setup.

The best choice depends on which email platform you already use, how advanced your automations are, and whether you care more about conversion optimization or simplicity. These are the strongest options:

My recommendations by scenario

If you run an ecommerce store (Shopify, WooCommerce, DTC):

1. Klaviyo — best all-in-one if email automation is important. Its built-in forms can create popups, flyouts, banners, and embedded forms that feed directly into lists and flows. www.klaviyo.com
2. OptinMonster + Klaviyo — best if you want more aggressive conversion optimization while keeping Klaviyo as the automation engine.

If you’re building a newsletter or content business:

• ConvertKit or Klaviyo are usually better than standalone popup tools because tagging and sequences matter more than flashy forms.

If you already have an email platform:

• Keep your email platform as the “source of truth” and choose a form tool that syncs into it.
• Example: OptinMonster → Klaviyo list → welcome automation → segmentation. wordpress.orgoptinmonster.com

Features worth prioritizing

Look for:

• Exit-intent popups
• Mobile-specific designs
• Multi-step forms (email first, preferences second)
• Hidden fields/source tracking (UTMs, landing page, campaign)
• A/B testing
• Segmentation tags
• Double opt-in/compliance controls
• Direct triggering of welcome sequences

For most businesses today, I’d shortlist:

• Best overall: Klaviyo
• Best popup specialist: OptinMonster
• Best simple setup: Mailchimp
• Best CRM automation: HubSpot

If you tell me your current email platform (Mailchimp, Klaviyo, HubSpot, ActiveCampaign, etc.), website platform (Shopify/WordPress/Webflow/etc.), and whether this is for ecommerce or lead generation, I can narrow it down.

If your main goal is “make attractive popups + embedded forms, put people into the right email list, and trigger automations”, I’d narrow it to these:

My recommendation

1. If you're running an online store → Klaviyo

This would be my first choice. Its native forms include popups, flyouts, embedded forms, full-page forms, banners, and teasers, and forms can be targeted using things like segments, location, cart value, and UTM parameters. www.klaviyo.com

The big advantage is that the form isn't really a separate tool: the subscriber goes straight into your Klaviyo customer profile/list, where you can immediately trigger welcome sequences, abandoned-cart flows, post-purchase automations, segmentation, etc. developers.klaviyo.com

2. If you're a creator / coach / consultant → Kit

Kit is particularly attractive when the signup is something like:

“Get my free guide” → tag subscriber → send 5-day welcome sequence → pitch product/course

Its landing pages connect directly to automations, including tagging subscribers based on signup source and automatically delivering lead magnets. kit.com

3. If you already have an email platform but want MUCH better popups → OptinMonster

This is the one I'd investigate if you don't want to replace your existing email marketing system. It specializes in conversion-focused popups and integrates with a large number of email/CRM platforms, including Mailchimp, HubSpot, Kit/ConvertKit, Klaviyo and ActiveCampaign. wordpress.org

One important distinction

There are really two categories here:

Email platform with forms built in

• Klaviyo
• Kit
• Mailchimp
• beehiiv

Dedicated conversion/form layer

• OptinMonster

If you want one system, I'd pick the first category. If you already love your email platform and just hate its forms, I'd use OptinMonster on top of it.

What I'd choose

• Shopify/e-commerce: Klaviyo
• Course/coaching/consulting: Kit
• Newsletter/media business: beehiiv
• Existing email system + need powerful popups: OptinMonster
• Small business wanting relatively simple all-in-one: Mailchimp

For reference, beehiiv's current embedded forms can automatically add subscribers to its audience and trigger automations from form submissions. www.beehiiv.com Mailchimp also now offers popup forms with 80+ templates and targeting capabilities. mailchimp.com

If you tell me what you're currently using for your email list (e.g. Mailchimp, ActiveCampaign, HubSpot, Constant Contact, Kit, Klaviyo) and what your website is built on (WordPress, Squarespace, Shopify, Webflow, etc.), I can tell you the best specific setup and whether you should replace or add a form tool.