ChatGPT answers, unedited

If you need tag-based segmentation and custom fields for free, these are the strongest options to look at:

My shortlist for your use case (“manage multiple newsletters” + “tag-based segmentation”):

1. Kit — probably the simplest if you want one subscriber database with tags like:

• newsletter_a
• newsletter_b
• interested_in_ai
• customer
• event_attendee
• beehiiv — better if each newsletter is more like a publication and you want subscriber preferences/custom fields. Mr Review AI
• MailerLite — a good all-around choice if you need classic email marketing features (forms, fields, segments, automations) rather than a creator-first newsletter workflow. MailerLite

A setup I’d use:

• One master subscriber list
• Custom fields for stable data:

• name
• company
• role
• location
• Tags/groups for changing interests:

• subscribed_newsletter_1
• subscribed_newsletter_2
• clicked_topic_X
• attended_webinar

That avoids duplicating contacts across multiple newsletters.

If you tell me roughly how many subscribers you have and whether these are separate brands/newsletters or different topics to the same audience, I can narrow it down.

If you need multiple newsletters with tag-based segmentation and custom fields on a $0 plan, these are the strongest options to look at:

For your use case (managing multiple newsletters), I’d narrow it down like this:

• Most flexible tagging + custom data: mailrelay.com — good if you want subscriber records like interest=AI, newsletter=weekly, customer=yes, etc. Mailrelay
• Creator/newsletter workflow: kit.com — good if each newsletter has different audiences and you want tags to drive broadcasts. Zapier
• Higher free subscriber allowance: sender.net — useful if your lists are already growing. Sender

One thing to watch: many tools advertise “segmentation” for free but reserve advanced rules, automation triggers, or dynamic segments for paid tiers. For a true tag/custom-field workflow at no cost, verify that the free plan lets you create fields, apply tags, and send campaigns to filtered groups before migrating. GetResponse Mailrelay

If you tell me roughly how many subscribers you have (e.g., under 1k, 10k, 50k+) and whether the newsletters are separate brands or one audience with categories, I can narrow it further.

Yes. For multiple newsletters + tag/custom-field segmentation at $0, the strongest options right now are:

• kit.com — best overall for multiple newsletters. Its free plan supports up to 10,000 subscribers, unlimited broadcasts, and audience tagging + segmentation. Kit Help Center
• beehiiv.com — best if newsletters are your primary focus. Its free Launch plan supports up to 2,500 subscribers, with subscriber tagging, custom fields, and segmentation included. It also supports up to 3 publications. Beehiiv Beehiiv
• mailerlite.com — good traditional email-marketing option. It has tags/interest groups, custom fields, and dynamic segments on the free tier, but the current free plan is limited to 250 active subscribers and 2,500 emails/month. MailerLite MailerLite MailerLite

My pick

If your key requirement is “I run several newsletters and need to tag people/custom-field them without paying”, I'd start with beehiiv if you want a newsletter-native platform, or Kit if you expect your subscriber base to grow beyond 2,500.

One important distinction: Kit's free plan allows 10,000 subscribers, but its free plan doesn't include automated sequences/visual automations. Kit Help Center

If you tell me roughly how many subscribers you have and how many separate newsletters/publications you run, I can narrow it down to the best free option.

Yes. If tag-based segmentation and custom fields need to be genuinely free, I’d shortlist these:

• mailerlite.com — best overall for traditional email marketing. Its free plan currently supports interest groups (tags), dynamic segments, and custom fields, with up to 250 active subscribers and 2,500 emails/month. MailerLite MailerLite
• beehiiv.com — best if you manage multiple newsletters/publications. Its free Launch plan supports up to 3 publications, subscriber tagging, custom fields, and segmentation. Beehiiv Beehiiv
• buttondown.com — excellent lightweight newsletter option. It supports tags and subscriber metadata for segmentation, and lets you create multiple newsletters. However, its tags are listed as available on the Basic plan, so I wouldn't choose it if "free forever" is the strict requirement. Buttondown Docs Buttondown
• brevo.com — good for large lists with low sending volume. The free plan allows unlimited contacts and 300 emails/day, while segmentation can use contact attributes/custom data. Brevo Brevo Help

My pick for your use case

If you have multiple newsletters and want to tag the same subscriber according to interests, I'd pick beehiiv if the newsletters are publications, or MailerLite if they're more like marketing/email campaigns.

For example, you could have:

Subscriber → Tech + AI + Weekly Digest

and send Newsletter A only to Tech, Newsletter B to AI, etc.

If you tell me roughly how many subscribers you have and whether you need 2–3 newsletters under one account, I can narrow this down to the best free option.

Yes. If you need subscriber tags/custom fields specifically on a $0 plan, I’d shortlist these:

• kit.com — best for multiple newsletters. Its free plan supports up to 10,000 subscribers, unlimited broadcasts, and audience tagging + segmentation. Kit uses one unified subscriber database, so someone subscribed to multiple newsletters doesn't get duplicated. Kit Kit Help Center
• mailerlite.com — best if you specifically want custom fields. Free users get tags/groups, segments, and custom fields, but the current free plan is limited to 250 active subscribers and 2,500 emails/month. MailerLite MailerLite MailerLite
• brevo.com — best for a large contact database. Its free plan allows up to 100,000 contacts and 300 email sends/day; contact attributes/custom fields and segmentation are supported. Brevo Help Brevo Help

My pick for your use case

If you're managing multiple newsletters under one operation, I'd choose Kit. Its tag/segment model is particularly suited to something like:

• newsletter_a
• newsletter_b
• newsletter_c
• topic_technology
• topic_finance
• subscriber_vip

Then you can combine tags into segments without maintaining separate lists. Kit Help Center

If custom fields (e.g. company, industry, plan, location, source) are more important than the subscriber limit, MailerLite is the stronger fit.

If you tell me roughly how many subscribers you have and how many newsletters, I can recommend the best free option and explain exactly how I'd structure the tags.

If you manage multiple newsletters and need tag-based segmentation + custom fields for free, these are the strongest options:

MailerLite Keila Factorio Newsletter### My picks by use case

• Best overall free hosted option: MailerLite

• Use tags/groups like newsletter_a, newsletter_b, customer, topic-ai, topic-finance.
• Add custom fields like source, interest, signup_date, or plan.
• Build segments that update automatically. MailerLite MailerLite
• Best if you run many newsletters under one system: Keila

• Supports custom contact data and segments based on tags/custom fields.
• Good fit if you want a more developer-friendly, privacy-focused setup. Keila
• Best if you want unlimited control and don't mind hosting: Mailtrain

• Supports custom fields, merge tags, and segmentation rules.
• You handle hosting and maintenance. Factorio Newsletter

A practical tagging structure for multiple newsletters:

• newsletter:tech
• newsletter:marketing
• newsletter:weekly-digest
• interest:ai
• interest:seo
• source:lead-magnet
• status:customer
• engagement:high

Then create segments like:

• “AI newsletter subscribers who are highly engaged”
• “Marketing readers who joined from the webinar”
• “All subscribers except newsletter X”

If you want one free tool that feels closest to a lightweight CRM, I’d start with MailerLite. If you need hundreds of thousands of subscribers or complex automation, I’d look at Keila/Mailtrain. MailerLite Keila

Yes. MailerLite is a strong fit if you need tags/segments on a genuinely free plan.

• MailerLite Free — supports unlimited interest groups (tags) and dynamic segments, so you can tag subscribers by newsletter, topic, source, interest, etc. MailerLite
• It currently allows up to 250 active subscribers and 2,500 emails/month for $0. MailerLite MailerLite
• You can also use custom variables for personalization, although some advanced personalization features are paid. MailerLite
• You can have unlimited audiences, which is useful if you're managing multiple newsletters. MailerLite

mailerlite.com

Another option: Brevo's free plan supports up to 100,000 stored contacts and includes automation, but its free sending allowance is only 300 emails/day. help.brevo.com

If your main requirement is “multiple newsletters + tags/custom fields + $0,” I'd pick MailerLite, especially if you're under 250 active subscribers.

Yes. MailerLite is probably the best fit if you specifically need tags + custom fields + segmentation on a genuinely free plan.

• MailerLite: Free up to 250 active subscribers and 2,500 emails/month. Its free tier includes unlimited interest groups (tags), dynamic segments, and custom fields, so you can segment by things like newsletter, topic, customer type, or signup source. MailerLite MailerLite
• Kit: Free up to 10,000 subscribers, with audience tagging and segmentation included. It's particularly good if your multiple newsletters are creator/content focused. Kit
• Brevo: Free with up to 100,000 stored contacts and 300 email sends/day, but its free tier is more constrained around advanced marketing functionality. Brevo Help

My pick

If your priority is flexible tag/custom-field segmentation, I'd choose MailerLite. If you have more than 250 subscribers, I'd look seriously at Kit instead.

One important 2026 change: MailerLite reduced its free limit from 500 to 250 active subscribers in June 2026. MailerLite

mailerlite.com
kit.com

If you need tag-based segmentation and custom fields for free, these are the strongest options for managing multiple newsletters:

My shortlist for your use case (multiple newsletters)

1. MailerLite — best overall fit

• Create tags like: - newsletter-tech
• newsletter-weekly
• customer
• lead-source-linkedin
• interest-ai
• Add custom fields like: - industry
• location
• signup source
• preferred newsletter
• Build segments from combinations of tags and fields. MailerLite
• Kit — best if your newsletters are creator/content focused

• Uses a subscriber-centric model: one person can have multiple tags and receive different newsletters based on interests. Sasanova
• Mailchimp — best if you need more traditional marketing workflows

• Tags and custom fields can be used to create targeted segments. Mailchimp

A setup I’d recommend for multiple newsletters:

• Use one master audience
• Add a tag for each newsletter subscription: - sub-newsletter-A
• sub-newsletter-B
• sub-newsletter-C
• Add behavior tags: - clicked-product
• opened-5-emails
• vip
• Use custom fields only for stable information: - company
• role
• country
• interest

This avoids maintaining separate lists and makes cross-promotion much easier.

Yes. If tag-based segmentation and custom subscriber fields are the priority, I’d shortlist these:

• kit.com — best for multiple newsletters/creators. Its free plan supports up to 10,000 subscribers, unlimited broadcasts, and audience tagging + segmentation at $0. Kit is particularly good if you want one subscriber database organized with tags and segments rather than maintaining separate lists. Kit Help Center Kit Help Center
• mailerlite.com — best if you specifically need custom fields. Its free plan includes tags/interest groups and dynamic segments, and MailerLite supports custom fields for storing things like publication, topic interest, location, or subscriber type. The catch is the current free limit: 250 active subscribers and 2,500 emails/month. MailerLite MailerLite MailerLite
• brevo.com — worth considering for a large database. Its free plan allows up to 100,000 contacts, though sending is limited to 300 emails/day. Brevo Help

My pick

If you're managing several newsletters under one operation, I'd choose Kit if tags are enough. Its model is explicitly built around one subscriber list with tags + segments, which avoids duplicating subscribers across lists. Kit Help Center

If you need actual custom fields such as:

newsletter = Tech
interest = AI
source = LinkedIn
subscriber_type = Paid

then MailerLite is the more straightforward fit, but its 250-subscriber free ceiling is a significant limitation. MailerLite

If you tell me roughly how many subscribers you have across all newsletters (e.g. 500, 5k, 50k), I can narrow this down to the best genuinely-free option.

If you need tag-based segmentation and custom fields for multiple newsletters at $0, these are the strongest options to look at:

My shortlist:

1. MailerLite — probably the best fit if you run several newsletters and want to label people by interest (e.g., tech, finance, weekly-digest, customer-type) while keeping one subscriber database. It supports tags/interest groups, custom fields, and segmentation on its free offering. MailerLite MailerLite
2. Kit — good if your newsletters are creator/content-focused. Its free tier is generous for list size and supports subscriber tagging. Sasanova
3. Mailrelay — worth considering if you need more CRM-like fields and segmentation without immediately paying. Mailrelay

A setup I’d use for multiple newsletters:

• Keep one master audience
• Add tags like: - newsletter_a
• newsletter_b
• topic_ai
• topic_marketing
• customer
• lead
• Add custom fields like: - company
• role
• signup_source
• preferred_frequency

That avoids maintaining separate lists and makes cross-newsletter targeting much easier.

If you have more than ~5,000 subscribers or need complex automation rules, the free tiers become much more restrictive, and the best choice may change.

If you manage multiple newsletters and need tag-based segmentation plus custom fields without paying, these are some of the stronger free options:

My shortlist:

• Best overall for multiple newsletters: Kit — its free plan includes audience tagging and segmentation and supports up to 10,000 subscribers. Kit Help Center
• Best if custom fields are essential: MailerLite — you can store subscriber details as fields and segment using tags/groups and filters. MailerLite
• Best if you want very granular data models: FeedBlitz — it advertises unlimited subscriber tags and custom fields. FeedBlitz

For a setup like:

• Newsletter A → tag: finance
• Newsletter B → tag: ai-tools
• Newsletter C → tag: founders
• Custom fields → industry, company_size, signup_source

…I’d start with Kit or MailerLite. They are easier to maintain than tools built around separate lists, because one subscriber record can carry multiple interests. Kit Help Center MailerLite

If you tell me your approximate subscriber count and whether you need multiple sending identities/domains or just multiple segments, I can narrow it down.

Yes. MailerLite is probably the best fit if you need tags + custom fields + segmentation on a genuinely free plan.

• mailerlite.com — Free plan supports unlimited interest groups (tags), dynamic segments, and custom fields. The catch is the free plan is limited to 250 active subscribers and 2,500 emails/month as of 2026. MailerLite MailerLite
• kit.com — Free plan supports up to 10,000 subscribers and includes audience tagging and segmentation. It's particularly attractive if your newsletters are creator/content-focused. Kit Help Center

My pick

If you're managing multiple newsletters with different subscriber attributes, I'd choose MailerLite if you're under 250 subscribers. Its custom fields let you store things like:

Newsletter = Tech
Interest = AI
Customer = Yes
Source = Newsletter A

…and then build segments from those fields/tags. MailerLite MailerLite

If you expect to have more than 250 subscribers, Kit's free tier is dramatically more generous on subscriber count while still giving you tags and segmentation. Kit Help Center

If you tell me roughly how many subscribers you have and how many separate newsletters you manage, I can recommend the best free option (including Brevo, Kit, MailerLite, and others) based specifically on your setup.

Yes. If tag-based segmentation and custom fields must both be available on the free plan, I’d shortlist these:

• kit.com — best for newsletters. The free plan supports up to 10,000 subscribers, unlimited broadcasts, and audience tagging + segmentation. Kit is particularly nice if you manage multiple newsletters because it uses one subscriber database with tags/segments rather than forcing you into separate lists. Kit Help Center Kit Help Center
• mailerlite.com — best if you specifically need custom fields. Its free plan includes tags/interest groups, dynamic segments, and custom subscriber fields. The catch is the current free plan is only 250 active subscribers and 2,500 emails/month. MailerLite MailerLite
• brevo.com — worth considering for a larger contact database, although its tagging/custom-attribute setup is more CRM-oriented than newsletter-centric. Brevo Help

My pick

If you're managing multiple newsletters with overlapping audiences, I'd choose Kit. You can structure things like:

• Newsletter: Tech
• Newsletter: Finance
• Interest: AI
• Interest: Startups
• Source: Website
• Engagement: Highly engaged

Then build segments from combinations of those tags rather than maintaining separate lists. Kit explicitly supports this tag/segment model on its free tier. Kit Help Center Kit

If custom fields such as company, industry, location, or subscription_date are essential, MailerLite may be the better fit—but its 250-subscriber free limit is a major constraint. MailerLite MailerLite

If you tell me roughly how many subscribers you have across the newsletters and whether you need custom fields vs. just tags, I can narrow it down to the best 2–3 free options.

Yes. If tag-based segmentation or custom fields must be free, I’d shortlist these:

• kit.com — best for newsletters. Its free plan supports up to 10,000 subscribers, unlimited broadcasts, and audience tagging + segmentation. Kit is particularly well suited if you're managing several newsletters or content interests because one subscriber can have multiple tags rather than forcing you into separate lists. Kit Kit Help Center
• mailerlite.com — best if you specifically need custom fields. Its current free plan supports 250 subscribers, unlimited interest groups/tags, dynamic segments, and custom fields. MailerLite MailerLite
• brevo.com — good for a large contact database. The free tier allows up to 100,000 contacts, although sending is limited to 300 emails/day. Brevo Help

My pick for your use case

If you mean something like:

Subscriber → Newsletter A + Newsletter C + "Tech" + "Paid customer" + "US"

I'd choose Kit. Its tagging/segmentation model is designed around exactly this kind of subscriber organization, and the free subscriber allowance is dramatically higher than MailerLite's current 250-subscriber limit. Kit Help Center Kit

If you tell me roughly how many subscribers you have and how many separate newsletters you're managing, I can narrow this down to the best 2–3 free options, including their automation limits.

Yes. MailerLite is probably the best fit if your priority is tag-based segmentation + custom fields on a genuinely free plan.

• mailerlite.com — Free plan currently supports up to 250 active subscribers and 2,500 emails/month, plus unlimited interest groups (tags), dynamic segments, and custom fields. MailerLite MailerLite
• You can create tags/groups such as Newsletter-A, Newsletter-B, Product-Interest, or VIP, and custom fields such as company, industry, or source, then segment subscribers using those attributes. MailerLite MailerLite
• Sender is worth considering if you need a larger free list: its free tier is reported at 2,500 subscribers / 15,000 emails per month, with segmentation and automation. Sender
• Brevo is another strong option if you have lots of contacts; it supports custom contact attributes (up to 200) and segments. Brevo Help Brevo Help

My pick

If you're managing multiple newsletters and want to tag the same person into different newsletter audiences, I'd start with MailerLite. Its combination of tags/groups + custom fields + dynamic segmentation is particularly well suited to this setup.

If you tell me roughly how many subscribers you have and how many newsletters you're managing, I can narrow it down to the best 2–3 free options.

If you manage multiple newsletters and need tag-based segmentation plus custom fields without paying, these are some of the better options:

My shortlist for multiple newsletters:

1. MailerLite — probably the easiest fit if you need one subscriber database with tags like:

• newsletter_A
• newsletter_B
• customer
• interested_ai
• event_attendee

Then you can build segments from those tags and custom fields. MailerLite

2. Kit — strong if each newsletter is a creator-style publication and you want subscriber tagging workflows. Sasanova
3. Keila — best if you want to own the infrastructure or need very flexible data models. Keila

One thing to check: many “free” newsletter tools allow segmentation but limit automation, number of subscribers, or number of users. If you tell me roughly:

• subscriber count,
• number of newsletters,
• whether you need automations (welcome sequences, tag-on-click, etc.),
• and whether you need one shared audience or separate lists,

I can narrow it down.

Yes. For multiple newsletters + tag-based segmentation + custom fields on a free plan, I’d shortlist these:

• Kit — best if you have multiple newsletters. Its free plan supports up to 10,000 subscribers, unlimited broadcasts, and audience tagging & segmentation. Kit uses one central subscriber database, so you can organize people with tags and segments rather than maintaining separate lists. Kit Help Center Kit Help Center
• MailerLite — best if custom fields are especially important. It supports custom fields, interest groups/tags, and segmentation on the free plan, although the current free tier is limited to 250 active subscribers and 2,500 emails/month. MailerLite MailerLite MailerLite

My pick

Kit is probably the better fit for your situation if you're managing several newsletters. You can have, for example:

• newsletter:tech
• newsletter:finance
• newsletter:weekly
• interest:AI
• interest:investing

Then build segments combining those tags and other subscriber criteria. Kit explicitly supports using tags, custom fields, forms, and other criteria together in segments. Kit Help Center

The big advantage is the 10,000-subscriber free allowance, versus MailerLite's current 250 active-subscriber limit. Kit Help Center MailerLite

If you tell me roughly how many subscribers you have and whether you need multiple sending addresses/domains, I can narrow it down to the best 2–3 free options.

If you manage multiple newsletters and need tag-based segmentation + custom fields for free, these are the strongest options:

My picks by use case

• Best overall free hosted option: MailerLite

• Example tags: finance, product_updates, vip, event_attendee
• Example custom fields: industry, company_size, signup_source
• Easy to create segments like “send Newsletter A only to subscribers tagged finance.” MailerLite
• Best if you run several publications/newsletters: beehiiv

• Built specifically around newsletters.
• Useful if each newsletter has overlapping audiences and you need subscriber attributes. Beehiiv Help
• Best no-subscription-cost/self-hosted option: Mailtrain

• You avoid SaaS fees, but you handle hosting and maintenance. Mailtrain

A practical structure for multiple newsletters is:

• One subscriber database
• Tags for interests/topics (AI, marketing, local, premium)
• Custom fields for facts (source, role, company, location)
• Segments that combine them (AI + founders + US)

If you share your approximate subscriber count and whether the newsletters are separate brands or different topics to the same audience, I can narrow this to the cheapest setup.

Yes. For multiple newsletters with tag-based segmentation and custom fields on a free plan, I’d shortlist these:

• kit.com — best overall for newsletters. The free plan supports up to 10,000 subscribers, unlimited broadcasts, and audience tagging + segmentation. Kit uses one central subscriber database, so you can tag people based on which newsletter/form they subscribed to rather than maintaining separate lists. Kit Help Center Kit Help Center
• mailerlite.com — best if custom fields are especially important. It supports interest groups/tags, custom fields, and segmentation. However, as of June 2026, the free plan is limited to 250 active subscribers and 2,500 emails/month, so it's much more restrictive for a growing portfolio of newsletters. MailerLite MailerLite MailerLite
• brevo.com — worth considering for a larger contact database. Its free plan allows up to 100,000 stored contacts, although sending is limited to 300 emails/day. Its segmentation/custom-attribute approach is more CRM-oriented than newsletter-oriented. Brevo Help

My pick

Kit would be my first choice if your workflow is something like:

Subscriber → newsletter_A tag + topic_tech tag + custom field → send only Newsletter A / Tech content

Its free plan is unusually generous for this use case, and tags + segments are explicitly included at no cost. Kit Help Center Kit Help Center

If you tell me roughly how many subscribers you have across all newsletters and whether you need custom fields specifically (e.g. newsletter = X, industry = Y), I can narrow it down to the best 1–2 options.

If you manage multiple newsletters and need tag-based segmentation + custom fields without paying, these are some of the better options:

My picks for your use case

• Best overall free choice: MailerLite

• Good if you run several newsletters and want simple tagging like: - newsletter:tech
• newsletter:finance
• interest:AI
• customer:paid
• Custom fields let you store things like source, persona, location, or subscription type. MailerLite
• Best if segmentation is the priority: FeedBlitz

• It is built around subscriber data organization, with unlimited tags and custom fields advertised as part of its subscriber management system. FeedBlitz
• Best if you want a simple creator newsletter platform: Joyful

• More lightweight, with tags and segmentation included in the free plan. Joyful

For multiple newsletters under one account, I would generally avoid tools that force you into separate lists/audiences because you can end up duplicating subscribers. A single subscriber database with tags is usually cleaner.

A good structure would be:

• Tags: - topic_ai
• topic_marketing
• source_linkedin
• source_website
• status_vip
• Custom fields: - company
• role
• signup_date
• newsletter_preference

That lets one subscriber receive exactly the newsletters they opted into without maintaining multiple copies of the same contact.

Yes. If tags or custom fields are the key requirement and you want to stay at $0, I’d shortlist these:

• MailerLite — best fit overall. Its free plan includes groups (used as tags), segmentation, and custom fields. You can segment subscribers by groups/tags and custom-field data. MailerLite MailerLite MailerLite

Caveat: as of June 2026, the free tier is limited to 250 active subscribers and 2,500 emails/month. MailerLite

• Brevo — better if your lists are larger. The free plan supports up to 100,000 stored contacts, with 300 email sends/day. It supports custom contact attributes and segmentation, so you can create fields such as newsletter, interest, source, or customer_type. Brevo Help Brevo Brevo Help

Caveat: its free sending limit is quite restrictive for newsletters because of the 300/day cap.

My pick

If you're managing multiple newsletters and want straightforward tag-based segmentation, I'd start with MailerLite. Its groups/tags + segments model is particularly convenient for things like:

Newsletter A → tech → paid → weekly

If you expect more than 250 active subscribers, I'd lean toward Brevo instead.

If you tell me roughly how many subscribers you have and how many emails/newsletters you send per month, I can identify the best genuinely-free option for your setup.

If you manage multiple newsletters and need tag-based segmentation + custom fields at $0, these are the strongest free options:

MailerLite Sasanova Joyful FeedBlitz### My shortlist for your use case

1. mailerlite.com — probably the best free choice

• Use tags/interest groups like: - newsletter_A
• newsletter_B
• customer
• topic_ai
• topic_finance
• Add custom fields like: - industry
• location
• signup source
• preferred newsletter
• Build segments from combinations of tags + fields. MailerLite
• kit.com — good if newsletters are creator/audience focused

• Uses tags heavily for subscriber organization.
• Good model: one subscriber database + tags instead of separate lists. Sasanova
• beehiiv.com — good if you run publication-style newsletters

• Better if you care about newsletter growth tools, analytics, and publishing workflows. Sasanova
• feedblitz.com — strongest tagging flexibility

• Advertises unlimited subscriber tags and custom fields, useful for complex segmentation. FeedBlitz

For multiple newsletters under one account, I’d generally avoid creating separate contact lists. A cleaner setup is:

• One master subscriber database
• Tags for newsletter membership (NL-Tech, NL-News, NL-Offers)
• Custom fields for stable attributes (industry, role, language)
• Segments built from those rules

That structure makes it much easier to avoid duplicate subscribers and lets one person receive several newsletters without being counted multiple times.

Yes. MailerLite is probably the best fit if tags/custom fields are your priority.

• MailerLite — Free plan supports unlimited interest groups (tags), dynamic segments, and custom fields. You can segment subscribers by tags, engagement, location, or custom-field values. MailerLite MailerLite
• Current free limits: 250 active subscribers and 2,500 emails/month. MailerLite MailerLite
• Brevo — also has a strong free tier: up to 100,000 contacts, custom contact attributes, and segmentation. However, the free plan is limited to 300 email sends per day, which can matter for newsletters. Brevo Help Brevo Help

My pick

If you're managing multiple newsletters with relatively small lists, I'd choose MailerLite because its tagging/group system is particularly straightforward. You can have tags such as tech, finance, weekly, premium-interest, etc., and combine them with custom fields for more sophisticated segmentation. MailerLite MailerLite

If your combined audience is much larger than 250 subscribers, Brevo is worth considering because its free contact allowance is dramatically larger, although its daily sending cap is restrictive. Brevo Help

mailerlite.com
brevo.com

Yes. MailerLite is probably the best fit if tags/custom fields are your priority.

• Tags: Unlimited “interest groups” (effectively tags) are included on the free plan. You can manually tag subscribers or automatically tag them based on behavior. www.mailerlite.com
• Custom fields: You can create your own subscriber fields—e.g. Newsletter, Industry, Customer type, Interest, etc.—and use them for personalization and segmentation. www.mailerlite.com
• Segmentation: Dynamic segments can be built from subscriber data and behavior. www.mailerlite.com
• Free limit: Currently up to 250 active subscribers and 2,500 emails/month. www.mailerlite.com

MailerLite free plan

If you have several newsletters, I'd structure it as:
Newsletter A / Newsletter B / Newsletter C → tags/groups, while things like industry, role, or subscription source → custom fields.

If your subscriber count is over 250, tell me roughly how many you have (e.g. 1k, 5k, 10k), and I can point you to the best genuinely-free option for that size.

Yes. If tags/custom fields are the key requirement and you want them on a free plan, I’d shortlist these:

Best fit: MailerLite

MailerLite explicitly supports interest groups (tags), custom fields, and segmentation on its free plan. You can tag subscribers by newsletter/topic, then target or exclude those groups when sending campaigns. www.mailerlite.com

For example, you could have:

• newsletter-tech
• newsletter-finance
• newsletter-weekly
• customer
• lead
• Custom field: industry
• Custom field: subscription_source

Its groups can be manually managed, while segments automatically update based on conditions. www.mailerlite.com

Strong alternative: Brevo

Brevo's free plan is $0/month and allows up to 100,000 stored contacts, although sending is limited to 300 emails/day. It supports custom contact attributes—including text, category, multiple-choice, dates, numbers, and booleans—and those attributes can be used for segmentation. help.brevo.com

My pick for managing multiple newsletters: MailerLite, especially if you want a straightforward tag/group model rather than treating every newsletter as a separate list.

Yes. If you need both tags and custom fields on a free plan, I’d look at these first:

• mailerlite.com — best fit for newsletters. It supports interest groups/tags, custom fields, and segmentation. MailerLite MailerLite MailerLite

• Tags: interest groups such as tech, finance, weekly
• Custom fields: e.g. Company, Role, Newsletter_Type
• Segmentation: combine fields/groups into targeted audiences
• Important current free-plan limit: as of June/August 2026, the free plan is limited to 250 active subscribers and 2,500 emails/month. MailerLite
• brevo.com — best if you expect a larger contact database. Its free plan allows up to 100,000 stored contacts and 300 email sends/day, and it supports custom contact attributes plus segmentation. Brevo Help Brevo Help Brevo Help

• Custom fields can be text, date, number, category, multiple-choice, boolean, etc.
• You can segment based on those fields.
• It doesn't use "tags" quite as naturally as MailerLite, although Brevo does support tags as segmentation conditions.

My pick for multiple newsletters: MailerLite if your lists are under 250 active subscribers; Brevo if having a large shared subscriber database is more important.

If you tell me roughly how many subscribers you have across the newsletters (e.g. 500, 5,000, 50,000), I can narrow it down to the best free option.

Yes. MailerLite is probably the best fit if you specifically want tags + custom fields + segmentation on a genuinely free plan.

• MailerLite — Free for up to 250 active subscribers and 2,500 emails/month. The free plan includes interest groups (tags), dynamic segments, and custom fields, so you can segment readers by things like Newsletter A, Newsletter B, Topic: AI, Customer, etc. MailerLite MailerLite MailerLite

mailerlite.com

• Brevo — Also free, with unlimited contacts stored and 300 email sends/day. It supports custom contact attributes and segmentation, making it attractive if your lists are larger. Brevo Help Brevo Help Brevo Help

brevo.com

My pick for multiple newsletters

MailerLite if you have ≤250 active subscribers and want a straightforward tag/group system.

Brevo if the main constraint is subscriber count rather than monthly sending volume.

If you tell me roughly how many subscribers you have across the newsletters (e.g. 500, 5,000, 20,000), I can narrow it down to the best free option.

Yes — MailerLite is probably the best fit for what you described.

• Tags/groups: Its “Interest Groups” function works like tags, and the Free plan includes unlimited interest groups (tags). www.mailerlite.com
• Custom fields: You can create additional subscriber fields such as newsletter_type, industry, role, or source, and use them for personalization/segmentation. www.mailerlite.com
• Segmentation: You can build dynamic segments from tags, custom data, engagement, location, etc. www.mailerlite.com
• Free limit: As of August 2026, the Free plan supports 250 active subscribers and 2,500 emails/month, with 2 user seats. www.mailerlite.comwww.mailerlite.com

MailerLite Free Plan

One caveat: if you're managing multiple newsletters with several hundred+ subscribers each, the 250-subscriber free limit could become restrictive. Brevo has a much larger contact allowance—up to 100,000 contacts on its free plan—but its free sending limit is only 300 emails/day, so it's a different tradeoff. help.brevo.com

If you tell me roughly how many subscribers you have across the newsletters, I can narrow this down to the best 2–3 genuinely free options.

Yes. MailerLite is probably the best fit if you specifically need tags/groups + custom fields + segmentation on a $0 plan.

• MailerLite — Free plan supports interest groups (tags), custom fields, and dynamic segmentation. The catch: the free plan is limited to 250 active subscribers and 2,500 emails/month. www.mailerlite.com
• Brevo — Better if you have a large contact database: its free plan allows up to 100,000 contacts and 300 emails/day. It supports contact attributes/custom fields and segmentation, though some of its newer tag functionality is plan-dependent. help.brevo.com

My pick for multiple newsletters

If you're managing several newsletters and want something like:

Newsletter = Tech
Newsletter = Finance
Interest = AI
Interest = Investing
Subscriber type = Paid

MailerLite is the cleaner choice because its groups/tags, custom fields, and segments are explicitly designed for this kind of organization. www.mailerlite.com

If you tell me roughly how many subscribers you have across the newsletters (e.g. 500, 5k, 50k), I can narrow it down to the best genuinely-free option.

Yes. If tag-based segmentation + custom fields must both be available on the free plan, I’d shortlist these:

My pick: MailerLite

MailerLite is probably the best fit if your priority is operational segmentation rather than just running a publication. Its free plan includes unlimited interest groups (tags) and dynamic segments, and MailerLite explicitly supports custom subscriber fields. www.mailerlite.com

For example, you could have:

• Newsletter: Tech
• Newsletter: Finance
• Interest: AI
• Interest: Startups

plus custom fields such as:

• Company
• Job title
• Industry
• Signup source

Then build segments such as “Finance + interested in AI” without paying.

Important: MailerLite changed its free plan in June 2026; it now caps the free tier at 250 active subscribers and 2,500 monthly emails, so that's the main drawback for managing multiple newsletters. www.mailerlite.com

If you have a larger audience

beehiiv is worth a serious look. It supports both subscriber tags and custom fields, including using custom-field answers to create dynamic segments. www.beehiiv.com

If you tell me roughly how many total subscribers you have and how many separate newsletters, I can narrow this down to the best actually-free option for your setup.

Yes. MailerLite is probably the best fit if you need both tags and custom fields on a free plan. It supports interest groups (effectively tags), custom subscriber fields, and segmentation. www.mailerlite.com

One important catch: as of June 2026, MailerLite's free plan is limited to 250 active subscribers and 2,500 emails/month. www.mailerlite.comhelp.kit.com

Other options:

• Kit — has subscriber tags and segmentation on its free plan; particularly good if these are creator/newsletter businesses. help.kit.com
• Brevo — free plan allows up to 100,000 stored contacts and 300 email sends/day, but its tagging/segmentation model is somewhat different and less newsletter-centric. help.brevo.com
• Buttondown — supports tags and subscriber metadata, but tags are on its Basic paid plan, so it doesn't meet your "tags at no cost" requirement. docs.buttondown.com

My pick: If you manage multiple newsletters and want to keep one subscriber database while using fields/tags to decide which newsletter someone receives, I'd start with MailerLite or Kit. Kit's model is explicitly built around one subscriber list with tags and segments rather than separate lists. help.kit.com

MailerLite · Kit · Brevo

If tag-based segmentation + custom fields must both be free, my top pick is MailerLite.

Best free options

MailerLite is probably the best fit for managing multiple newsletters. Its free plan includes unlimited interest groups (effectively tags), dynamic segments, and custom fields. www.mailerlite.com

For example, you could have:

• newsletter_tech
• newsletter_finance
• newsletter_weekly
• engaged
• customer
• Custom field: company
• Custom field: role
• Custom field: source

Then combine those attributes into segments for each newsletter. www.mailerlite.com

One caveat: MailerLite's current free plan is limited to 250 active subscribers and 2,500 emails per 30 days. www.mailerlite.com

If you have more than 250 subscribers, I'd look at Brevo first: its free plan supports up to 100,000 contacts and 300 emails/day, though its segmentation model is more attribute/criteria-oriented than MailerLite's tag-centric workflow. www.mailerlite.comwww.mailerlite.comhelp.brevo.com

If you tell me roughly how many subscribers you have and how many separate newsletters you're running, I can narrow this down to the best 2–3 options.

Yes. MailerLite is probably the best fit if you specifically need tags + custom fields for newsletter segmentation at $0.

• MailerLite — Free plan supports up to 250 active subscribers and 2,500 emails/month. It includes unlimited interest groups (tags) and segmentation. www.mailerlite.com
• It also supports custom fields (text, number, and date), which you can use for things like newsletter, industry, source, or customer_type. www.mailerlite.com
• For multiple newsletters, you can use interest groups/tags to keep audiences separate and send each newsletter only to the appropriate group. www.mailerlite.comwww.mailerlite.com

Another strong free option: Brevo. Its free plan allows up to 100,000 stored contacts, though you're limited to 300 email sends/day. It supports custom contact attributes and segmentation based on those attributes. help.brevo.com

My pick:

• MailerLite → better if you're primarily managing multiple newsletters and want straightforward tags/groups.
• Brevo → better if you expect a large contact database and don't mind the daily sending limit.

If you tell me roughly how many subscribers you have and how many newsletters you manage, I can narrow it down to the best free option.

Yes. MailerLite is probably the best fit if your priority is tags + custom fields on a genuinely free newsletter plan.

My pick: MailerLite

For managing multiple newsletters, MailerLite gives you:

• Tags/interest groups — e.g. tech, finance, weekly, premium-interest
• Custom fields — e.g. company, role, newsletter_preference
• Dynamic segmentation based on subscriber data and behavior
• The ability to put subscribers into multiple groups simultaneously. www.mailerlite.com
• Its current free plan allows 250 active subscribers and 2,500 emails/month. www.mailerlite.com

Brevo is the stronger alternative if you expect a larger contact database: its free plan allows up to 100,000 stored contacts, with 300 email sends/day, and supports custom attributes and dynamic segments. help.brevo.com

If you tell me roughly how many subscribers you have across the newsletters (e.g. 500, 5k, 50k), I can narrow it down to the best free option.

Yes. MailerLite is probably the best fit for your use case.

• Tags: MailerLite calls them Interest Groups. You can assign multiple groups/tags to a subscriber and use them for targeting. www.mailerlite.com
• Custom fields: You can create your own subscriber fields (e.g. Newsletter, Topic, Role, Company, Interests) and use them for segmentation. www.mailerlite.com
• Segmentation: You can combine fields, tags/groups, engagement, signup source, etc. into dynamic segments. www.mailerlite.com
• Free plan: As of August 2026, the free plan supports these segmentation features, but is limited to 250 active subscribers and 2,500 emails/month. www.mailerlite.com

Important distinction: If you're managing multiple newsletters, I'd structure it as:

Subscriber → Newsletter A tag + Newsletter B tag + Interest tags

rather than maintaining totally separate lists. That lets one subscriber receive different newsletters without duplicating contacts.

Brevo is another strong free option: its free plan supports up to 100,000 stored contacts, custom contact attributes, and segmentation, but its free sending limit is only 300 emails/day. help.brevo.com

My pick: MailerLite if tags/custom fields and newsletter segmentation are the priority; Brevo if having a large contact database is more important.

MailerLite 

Yes. MailerLite is probably the best fit if you need tags + custom fields + segmentation on a free plan.

My pick: MailerLite. Its free plan explicitly includes unlimited interest groups (essentially tags) and unlimited dynamic segments, and you can use custom fields to refine those segments. www.mailerlite.com

One important catch: MailerLite reduced its free audience limit to 250 active subscribers in June 2026, so it's excellent for small newsletters but less attractive if you have several lists that collectively exceed that size. www.mailerlite.com

If you have multiple newsletters and want one subscriber database with lots of tags, I'd look particularly closely at Sender: its free tier allows 2,500 subscribers and 15,000 emails/month, with segmentation and automation included. www.sender.net

MailerLite · Sender · Brevo

If you tell me roughly how many subscribers you have across the newsletters (e.g. 500, 5,000, 20,000), I can narrow it down to the best genuinely-free option.

Yes. If your priority is tags + custom fields + segmentation on a genuinely free plan, I’d look at these two first:

🥇 My pick: MailerLite

For multiple newsletters, MailerLite is probably the cleaner fit. Its free tier includes unlimited interest groups (tags) and dynamic segments, and you can create custom subscriber fields. www.mailerlite.com

For example, you could have:

• newsletter_tech
• newsletter_finance
• newsletter_weekly
• interested_ai
• customer
• Custom field: signup_source
• Custom field: company_size

You can then combine those fields/tags into segments and target individual newsletters appropriately. www.mailerlite.com

Important catch: MailerLite's free plan currently caps you at 250 active subscribers, despite allowing 2,500 emails/month. www.mailerlite.com

If you have a large contact database: Brevo

Brevo is interesting because its free plan allows up to 100,000 stored contacts and supports custom contact attributes, including text, number, date, category, multiple-choice, and boolean fields. help.brevo.com

The tradeoff is the 300 emails/day sending limit, so it's much more attractive if you need to store and segment lots of contacts than if you're sending high-volume newsletters. help.brevo.com

Bottom line:

• ≤250 subscribers + want straightforward newsletter tagging: MailerLite
• Thousands of contacts + custom-field-heavy segmentation: Brevo
• Multiple separate newsletters with overlapping subscribers: I'd lean MailerLite if you're under its subscriber limit.

Yes. For tag-based newsletter segmentation at $0, I’d shortlist these:

My pick for your use case: Kit. Its free Newsletter plan explicitly includes audience tagging and segmentation, unlimited broadcasts, and one basic automation for up to 1,000 subscribers. kit.com

If by “custom fields” you mean fields like:

• Newsletter = Tech
• Newsletter = Finance
• Role = Founder
• Interest = AI
• Source = Newsletter A

then MailerLite is particularly flexible: its custom fields can hold additional subscriber information, and its free plan includes unlimited interest groups (tags) and dynamic segments. www.mailerlite.com

One important current wrinkle: MailerLite's free tier was reduced to 250 active subscribers and 2,500 monthly emails in June/August 2026, so Kit is considerably more attractive if your lists are growing. www.mailerlite.com

Bottom line:

• Multiple newsletters + tagging → Kit
• Complex custom subscriber data → MailerLite
• Huge contact database → Brevo

If you tell me roughly how many subscribers you have across the newsletters and how many emails/month you send, I can narrow it down to the best free option.