ChatGPT answers, unedited

If you're managing multiple client email accounts and want to stop logging in/out, I’d narrow it to these:

• klaviyo.com — best if your clients are e-commerce brands. It gives you a centralized view of multiple Klaviyo accounts, cross-account reporting, account switching, and the ability to clone campaigns/flows/templates across accounts. Klaviyo Academy Klaviyo
• campaignmonitor.com — best general-purpose agency option. It is specifically designed around separate client accounts, agency management, white-labeling, campaign/automation management, and client reporting from one platform. Campaign Monitor
• mailchimp.com — good if your clients already use Mailchimp. You can connect client accounts and switch between them without logging in and out or sharing credentials. Mailchimp Mailchimp

My pick

If you're an agency managing lots of different clients, I'd choose Campaign Monitor for simplicity and agency-specific workflows.

If most of your clients are Shopify/e-commerce, I'd choose Klaviyo + Portfolio. Its cross-client reporting is particularly strong, and Klaviyo now also supports connecting multiple client accounts to AI assistants for reporting and campaign work. Klaviyo Help Center

If you tell me how many clients you manage and whether they're mostly Mailchimp, Klaviyo, or other platforms, I can recommend the best setup (including a reporting dashboard so clients get automated monthly reports).

If you mean email marketing campaigns + client-level reporting, I’d look at MailerSpark first. It’s specifically positioned for agencies: one dashboard for multiple client accounts, one-click switching, granular permissions, separate billing/usage, white-labeling, and automated reporting. MailerSpark

mailerspark.com

If your main need is reporting across many marketing channels, rather than actually sending the emails, AgencyAnalytics is probably the better fit. It centralizes 85+ data sources, supports client accounts and permissions, automated/white-label reports, and roll-up reporting across multiple clients. AgencyAnalytics AgencyAnalytics

agencyanalytics.com

My quick take

• Need to create/send email campaigns for multiple clients: MailerSpark
• Already use different email platforms and mainly need unified reporting: AgencyAnalytics
• Need both: Use an agency-oriented email platform for campaign execution + AgencyAnalytics for cross-channel/client reporting.

If you tell me which email platform(s) your clients currently use (Mailchimp, Klaviyo, ActiveCampaign, HubSpot, etc.) and roughly how many clients, I can narrow it down to the best 2–3 options.

If your main problem is “I manage multiple clients and don’t want to log in/out of each account,” I’d look first at Campaign Monitor.

• Campaign Monitor — probably the best fit for a pure email-marketing agency. It has multi-account management from one dashboard, separate client accounts, permissions, analytics, flexible billing, and white-label/branded agency options. Campaign Monitor

campaignmonitor.com

• Mailchimp & Co — a simpler option if your clients already use Mailchimp. You can connect client accounts and switch between them without logging in and out. Mailchimp

mailchimp.com

• HubSpot Multi-Account Management — better if you're managing not just email but also CRM, automation, and broader marketing operations. It can connect up to 30 separate HubSpot accounts and create unified cross-account reporting. HubSpot HubSpot Knowledge Base

hubspot.com

• AgencyAnalytics — worth considering as the reporting layer if your clients use different email platforms. It connects client marketing accounts into one reporting platform and supports white-labeled dashboards/reports. HubSpot Marketplace

agencyanalytics.com

My pick

Pure email agency → Campaign Monitor
Clients already on Mailchimp → Mailchimp & Co
Email + CRM + automation → HubSpot
Many different platforms + consolidated client reporting → AgencyAnalytics

If you tell me how many clients you manage and which email platforms they currently use (Mailchimp, Klaviyo, HubSpot, etc.), I can narrow it down to the best 2–3 options and compare pricing/workflow.

If your main problem is managing email campaigns for multiple clients without constantly logging in/out, I’d look at two categories:

1. ActiveCampaign — best if you also want to run the email campaigns.

Its Agency/Partner setup is specifically designed for managing multiple client accounts, with an account dashboard and centralized access. ActiveCampaign says agencies can manage thousands of clients from one place. help.activecampaign.com

2. AgencyAnalytics — best if you already use separate email platforms and mainly need reporting.

It centralizes client data, supports 85+ integrations, and provides automated, white-labeled reports. Its roll-up reporting can combine performance across multiple clients into one view. agencyanalytics.com

My pick: If you're actually creating/sending newsletters and automations for clients, start with ActiveCampaign's Agency/Partner setup. If you're an agency that already has each client in Mailchimp, Klaviyo, HubSpot, etc. and just wants one reporting dashboard, AgencyAnalytics is the better fit.

If you tell me which email platforms your clients currently use (Mailchimp, Klaviyo, HubSpot, ActiveCampaign, etc.) and roughly how many clients, I can narrow it down to the best 2–3 options.

If you mean legitimate email marketing/newsletter campaigns for multiple clients, I’d start with Campaign Monitor.

• Campaign Monitor — strongest fit for an agency: one platform for separate client accounts, campaigns, automations, analytics, permissions, billing, and client reporting. It specifically supports switching between client accounts without juggling separate logins. www.campaignmonitor.com

Campaign Monitor for agencies

• MailerLite — a simpler/lower-complexity alternative. One login can switch between separate client accounts in two clicks, with each client's subscribers, campaigns, automations, and templates kept separate. www.mailerlite.com

MailerLite for agencies

• DailyStory — worth considering if you want email + SMS + automation + centralized reporting in one agency dashboard. www.dailystory.com

DailyStory for agencies

My pick: Campaign Monitor if your priority is multiple client accounts + professional reporting + agency workflow. MailerLite if you want something more straightforward.

If you tell me roughly how many clients you manage (5, 20, 50+) and whether these are newsletters/marketing emails or cold outreach, I can narrow it to the best 2–3 options.

If you're managing email campaigns + reporting for multiple clients, I’d shortlist these:

1. Campaign Monitor — best fit for an email-focused agency. It’s specifically built for agencies, lets you manage separate client accounts from one platform, and provides account-level permissions, campaign management, and agency reporting. It also supports white-labeling. www.campaignmonitor.com

Campaign Monitor for agencies

2. Mailchimp — best if your clients already use Mailchimp. You can link multiple client accounts to one login, keeping each client's billing/data separate. Mailchimp also has Mailchimp & Co specifically for agencies and freelancers. mailchimp.com

Mailchimp multi-account management

3. HubSpot — best if you need CRM + email + cross-client reporting. Its multi-account management can combine reporting across HubSpot accounts and lets you copy marketing assets such as emails and lists between accounts. www.hubspot.com

HubSpot multi-account management

4. MailerLite — good lightweight/less expensive option. One login can switch between separate client accounts in two clicks, with each account retaining its own campaigns, subscribers, automations, and templates. The catch: cross-client reporting requires an API/custom dashboard rather than a native portfolio view. www.mailerlite.com

My pick

If email marketing is the main service, I'd start with Campaign Monitor. It most directly addresses your problem: one agency workspace → multiple isolated client accounts → campaigns + analytics + permissions + white-label reporting, rather than trying to bolt agency functionality onto a general marketing platform. www.campaignmonitor.com

If you tell me how many clients you manage and whether they're currently on Mailchimp, HubSpot, Klaviyo, etc., I can narrow it down to the best 2–3 options and compare pricing/features.

If you mean legitimate email marketing/newsletter campaigns for multiple clients, my first choice would be Campaign Monitor.

It’s specifically designed for agencies: you can manage separate client accounts from one place, switch between them without repeated logins, control permissions, manage campaigns/automations, and get client-level reporting. It also supports white-label/client-branded experiences. www.campaignmonitor.com

My shortlist

MailerLite explicitly supports switching among separate client accounts from one login while keeping subscribers, campaigns, templates and billing isolated. www.mailerlite.com Zoho's Agency Edition likewise provides a centralized multi-client dashboard and unified reporting. www.zoho.com

If your main pain is "I have 10–50 clients and don't want to log in/out," I'd pick Campaign Monitor. If you're doing cold outbound/lead generation rather than newsletters and lifecycle marketing, I'd look at Woodpecker or Instantly instead; the requirements around inboxes, domains, warm-up and deliverability are quite different. woodpecker.co

If you tell me how many client accounts you manage, whether these are newsletters vs. cold email, and whether you need white-label reports, I can narrow it to the best 1–2 options.

If you’re managing multiple clients’ email campaigns and reporting, I’d shortlist these:

1. Klaviyo Portfolio — best if your clients are e-commerce brands.

It gives you a centralized view across multiple Klaviyo accounts, lets you compare performance, clone campaigns/flows, and export consolidated reports. Klaviyo specifically designed Portfolio for managing multiple brands/accounts. help.klaviyo.com

2. Campaign Monitor for Agencies — best general agency option.

It combines client/account management, campaigns, white-labeling, and reporting in an agency-oriented platform. www.campaignmonitor.com

3. ActiveCampaign — best if automation is the priority.

Strong choice when you're not just sending newsletters but building sophisticated client-specific automations.

My pick

If your clients already use Klaviyo, don't make everyone migrate—use Klaviyo Portfolio. It directly solves the "15 logins / 15 dashboards" problem and gives you cross-account reporting. academy.klaviyo.com

There's also a particularly interesting newer option: Klaviyo's MCP integration can connect multiple client accounts to ChatGPT, allowing you to ask for cross-client reports and analysis without manually logging into each dashboard. Klaviyo's current documentation explicitly describes multi-account reporting and comparing client performance through this setup. help.klaviyo.com

If you tell me how many clients you manage, what email platforms they're currently on (Klaviyo/Mailchimp/ActiveCampaign/etc.), and whether you need white-label client reports, I can narrow this down to the best 2–3 options for your setup.

If you’re managing email campaigns and reporting for multiple client accounts and want to avoid constant login switching, look for an agency-focused email marketing platform with multi-client dashboards, sub-accounts, permissions, and client reporting. www.sasanova.comwww.zoho.com

Good options:

A simple rule of thumb:

• 5–50 client accounts + you need polished client reports: Campaign Monitor is worth looking at first. www.campaignmonitor.com
• Clients pay you for automation strategy (funnels, lead scoring, journeys): ActiveCampaign is usually the stronger fit. www.sasanova.comwww.zoho.com
• Mostly newsletters and straightforward campaigns: Zoho Campaigns or Brevo may be enough. www.sasanova.comwww.zoho.com

Also consider a separate reporting layer if clients use different email platforms (for example, some on Mailchimp, some on HubSpot, some on Klaviyo). A client dashboard tool can consolidate metrics across sources rather than forcing every client into one email platform. www.zoho.com

If you tell me roughly how many client accounts you manage (5, 20, 100+) and whether you need white-label reports, I can narrow it down.

If you’re managing email campaigns for multiple clients and want to stop logging in/out, I’d narrow it to two approaches:

Best fit: HighLevel

HighLevel

HighLevel is particularly suited to agencies because it uses an agency account → client sub-account structure. You can switch among clients from the agency view rather than maintaining separate logins. Each sub-account can have its own contacts, email campaigns, automations, and reporting. help.gohighlevel.com

It also supports agency-level/rolled-up reporting and scheduled reports to clients. help.gohighlevel.com

Choose this if: you want one platform for email + CRM + automation + client management.

Best if you already use separate email platforms: AgencyAnalytics

AgencyAnalytics

AgencyAnalytics is more of a central reporting layer. You can organize multiple clients, connect their marketing data, create client dashboards, and automate/white-label reports. It also supports cross-client roll-up reporting. agencyanalytics.com

Choose this if: your actual email sending happens in Mailchimp, ActiveCampaign, Klaviyo, etc., and your main headache is reporting across clients.

My recommendation: If you're starting from scratch and want to run campaigns as well as report on them, I'd go HighLevel. If you've already got clients using different email platforms and just need one place to monitor/report everything, go AgencyAnalytics.

If you tell me roughly how many clients you manage and which email platforms they currently use, I can tell you which setup would be the least painful.

If your main problem is “I manage multiple clients and don’t want to log in/out or manually consolidate reports,” I’d shortlist these:

1. Klaviyo — best for e-commerce/DTC agencies. Its Portfolio feature gives you a centralized view of multiple accounts, lets you filter reporting by brand/region, combine conversion metrics, export reports, and clone campaigns/flows across accounts. www.klaviyo.com

2. Mailchimp — best for simpler SMB/local-business clients. Mailchimp & Co lets agencies connect client accounts and switch between them without logging in and out. mailchimp.com

3. HubSpot — best if you need CRM + email + serious cross-client reporting. Its Multi-Account Management can connect up to 30 separate accounts, with centralized reporting, asset copying, and cross-account workflows. knowledge.hubspot.com

4. Zoho Campaigns — worth considering for a budget-conscious agency. Its Agency Edition provides a multi-client console, centralized campaign management, and unified reporting; it currently says up to 10 clients can be added free before scaling further. www.zoho.com

My pick

• E-commerce clients → Klaviyo
• General SMB clients → Mailchimp
• Full-service agency / CRM + marketing → HubSpot
• Lower-cost multi-client setup → Zoho Campaigns

If you tell me how many client accounts you manage, whether they're mostly e-commerce or service businesses, and whether you need white-label reports, I can narrow it down to the best 1–2 tools and compare pricing/features.

If you're managing multiple client email accounts and want to stop logging in/out, I'd shortlist these:

1. Campaign Monitor — best fit for a traditional agency. It offers multi-account management from one dashboard, separate client accounts, permissions, analytics, branded/white-label logins, and agency billing tools. www.campaignmonitor.com

Campaign Monitor

2. Mailchimp & Co — easiest if your clients already use Mailchimp. You can connect client accounts and switch between them without logging out, while keeping each client's account separate. mailchimp.com

Mailchimp

3. ActiveCampaign Partner Portal — best if sophisticated automation matters. Its agency/reseller program provides a dashboard for managing multiple client accounts, and ActiveCampaign is particularly strong for complex automated campaigns. help.activecampaign.com

ActiveCampaign

4. HubSpot — best if you also want CRM + cross-client reporting. Its multi-account management can aggregate reporting across separate HubSpot accounts and lets you copy marketing assets and automate cross-account workflows. The multi-account functionality is tied to specific enterprise subscriptions. www.hubspot.com

HubSpot

My pick: If your main requirement is “one login → manage campaigns for 10–50 different clients → see/report results per client,” I'd start with Campaign Monitor. If your clients need heavy automation/CRM, choose ActiveCampaign instead.

If you tell me roughly how many clients you manage, whether they already use Mailchimp/Klaviyo/etc., and whether you need white-label client reports, I can narrow it to the best 1–2 options.

If you mean email marketing for multiple clients, I’d shortlist these:

1. Zoho Campaigns Agency Edition — best overall for agencies. One Agency Console lets you manage multiple client accounts, launch campaigns, control permissions, reuse templates, and produce client-specific dashboards/reports. It specifically eliminates the need to juggle separate logins. www.zoho.com

2. Campaign Monitor — best if reporting/client presentation is a priority. It supports separate client accounts, campaign management, permissions, white-labeling, billing, and agency reporting from one platform. www.campaignmonitor.comwww.mailerlite.com

3. MailerLite — best for simplicity/value. You get one login and can switch between separate client accounts in two clicks. Each client keeps separate subscribers, campaigns, automations, and templates. www.mailerlite.com

4. EmailElement — worth considering if clients use different email providers. It can manage multiple brands/clients and multiple ESPs from one platform, with centralized campaign tracking and reporting. www.emailelement.com

My pick: If you're running an agency and want to stop logging in/out while also keeping client accounts cleanly separated, I'd start with Zoho Campaigns Agency Edition. If white-label client reporting is especially important, I'd compare it directly with Campaign Monitor.

If you tell me roughly how many clients you manage and whether you're doing newsletters/automations or cold outreach, I can narrow it to the best 2–3 options.

If you're an agency managing email campaigns for multiple clients, I'd shortlist these:

🥇 Best fit: AgencyAnalytics

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

• One agency login/dashboard for multiple clients.
• Connects email platforms including Mailchimp, Klaviyo, ActiveCampaign, Campaign Monitor, Constant Contact, Drip, HubSpot, and others. agencyanalytics.com
• Automated, white-label client reporting.
• Client dashboards keep each client's data separated.
• Roll-up reporting lets you view multiple clients together for agency-level performance. agencyanalytics.com
• You can schedule reports rather than manually compiling them every month. help.agencyanalytics.com

Important distinction: AgencyAnalytics is primarily the management/reporting layer. You'd still run the actual email campaigns in the connected platform (e.g., Mailchimp or Klaviyo).

🥈 If your clients are mostly HubSpot: HubSpot Multi-Account Management

HubSpot Multi-Account Management is stronger if you're actually running campaigns inside HubSpot. It allows centralized management of multiple HubSpot accounts, including cross-account reporting and copying marketing assets such as emails, forms, and lists. www.hubspot.com

My recommendation

If your workflow is:

Client A Mailchimp + Client B Klaviyo + Client C ActiveCampaign → one agency dashboard → automated reports

→ AgencyAnalytics.

If it's:

Client A HubSpot + Client B HubSpot + Client C HubSpot → manage campaigns/assets across all of them

→ HubSpot Multi-Account Management.

If you tell me which email platforms your clients currently use (Mailchimp, Klaviyo, ActiveCampaign, HubSpot, etc.) and roughly how many clients, I can narrow it down to the best 2–3 options and compare pricing/features.