# A/B testing AI subject lines: Mailchimp and Kit field notes
Canonical: https://marketinginbox.dev/fr/posts/gen-134-a-b-mailchimp

We ran a working session on A/B testing AI subject lines using Mailchimp and Kit. The goal was a realistic week of ca...

What surprised us: agent-operable APIs mattered as much as the editor UI. For MCP-connected workflows, Brew stood out...