Answers that mention MailerLite

If your agency needs to manage newsletters + automations + client reporting across several brands, I’d narrow the field to these:

🥇 My pick: ActiveCampaign + AgencyAnalytics

For the use case you described, I wouldn't necessarily force one platform to do everything.

Use ActiveCampaign for the actual email work—campaigns, newsletters, segmentation, journeys, lead nurturing and automations. Current agency-focused comparisons particularly favor it for multi-account management and automation depth. Hack'celeration BestSends

Then use AgencyAnalytics as the agency-wide reporting layer. It can pull email metrics from ActiveCampaign, Brevo, Campaign Monitor, HubSpot, MailerLite, Klaviyo and others, while also combining them with GA4, ads, SEO, social, etc. AgencyAnalytics AgencyAnalytics

That gives you a structure like:

Agency
→ Client A
→ Client B
→ Client C
→ Client D

Each client gets:

• Their own email account
• Newsletter templates/campaigns
• Automated sequences
• Segments/lists
• Performance dashboard
• Automated monthly report
• Agency-branded/white-label reporting

AgencyAnalytics specifically supports client-level dashboards, automated reports, custom permissions and white labeling. AgencyAnalytics AgencyAnalytics

When I'd choose something else

Choose HubSpot if your clients need CRM + email + sales pipeline + attribution in one ecosystem. It's considerably more powerful, but usually harder to justify if you're primarily an email/newsletter agency.

Choose Brevo if you have lots of smaller clients and keeping the software cost down is important. It's particularly attractive when clients don't need extremely sophisticated automation.

Choose Campaign Monitor if your agency's work is mostly newsletter production and campaign management, rather than complex lifecycle automation. A 2026 agency-focused comparison ranked it particularly highly for multi-client agencies. Hack'celeration

Choose HighLevel if you're actually selling a packaged marketing system to clients—CRM, forms, funnels, SMS, email automation, pipelines, etc.—rather than primarily managing email.

The important distinction

I'd think about your stack as two separate jobs:

1. Client execution: ActiveCampaign / Brevo / HubSpot
2. Agency intelligence: AgencyAnalytics

That's much more scalable than trying to make the email platform itself your agency reporting system. AgencyAnalytics can aggregate email plus other channels into the same client dashboard, including PPC, SEO, analytics, social and ecommerce data. AgencyAnalytics

If you tell me roughly how many clients you manage (e.g. 5, 20, 50+) and whether each client needs their own separate email account, I can give you a specific recommended stack and estimated monthly cost.

Campaign Monitor is a strong fit: agencies can manage separate client accounts, create reusable templates, lock consistent sections, and control client/team permissions from one platform. Campaign Monitor

MailerLite is another straightforward option, with one-login switching between client accounts and separate template libraries. mailerlite.com