An agency needs to run many client accounts, prove results and keep margin. We reweighted for multi account control, reporting and partner programs, then ranked the five platforms that serve agencies best.
Reviewed by M. HALLORAN·Updated MAY 2026·How we vet
Tools compared5
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 accounts, reporting clients can see and partner economics. See the full rubric →
Multi account management25%
Reporting and proof20%
Features and automation20%
Integrations20%
Partner economics15%
01
RANK
★ Editor’s Choice
Klaviyo SMS
Best for ecommerce agencies
The platform most ecommerce agencies standardize on, with a real partner program, a portfolio view across client stores and unified email plus SMS reporting to show results. Clients are billed per account on credits, so margin comes from the work, not reselling the software.
Built with agencies in mind, Sakari makes spinning up and managing many client accounts straightforward, with unlimited users and deep Zapier and HubSpot links. It is a messaging layer rather than a campaign suite, so heavy ecommerce flows live elsewhere.
For an agency whose clients are all on Shopify, Postscript offers an agency partner track and clean per store automations. The Shopify only scope is the limit: it is no help for a client off the platform.
A dependable way to run campaigns across clients, with multiple seats and a tidy inbox. There is no true multi tenant console, so agencies manage accounts side by side rather than from one pane.
When a client needs something bespoke, Twilio is the programmable foundation to build it on, priced per message before carrier fees. It demands engineering, but for custom client work nothing here is more flexible.