An agency platform has to juggle many client accounts, prove results in a report and stay profitable on resold seats. We weighted multi client management, automation and value, then ranked the six that serve agencies best.
Reviewed by M. HALLORAN·Updated APRIL 2026·How we vet
Tools compared6
Criteria weighted5
Last reviewedJune 2026
Paid placements0
How we ranked the field
Scored on the same five criteria as our main ranking, then reweighted for agency work: managing many clients, automation you can template, reporting and white label, value, and deliverability. See the full rubric →
Multi client management25%
Automation25%
Reporting and white label20%
Value for money15%
Deliverability15%
01
RANK
★ Editor’s Choice
ActiveCampaign
Best for client automation
Its automation depth and account structure let an agency build reusable workflows across clients, and the CRM keeps each account organized. There is no free tier and seat costs add up, so price each engagement with care.
An all in one that covers email, landing pages, funnels and webinars under one login, which lets a small agency deliver more from a single tool. Reporting is solid; some modules trail a focused rival.
Low per account cost and a clean editor make MailerLite ideal when an agency runs many modest lists. It lacks a true multi client console, so heavier agencies juggle separate logins.
Send based pricing keeps costs predictable across many client lists, and a sub account structure on higher tiers helps with separation. The editor is plainer than the design led tools.
If your roster is online stores, Klaviyo is the platform clients ask for by name, with a partner program built for agencies. Outside ecommerce it is more than most clients need.
Clients already know it, and the Mailchimp & Co agency program adds client management and perks. Value erodes at higher contact counts, so watch the resold margin.