# A/B testing AI subject lines: Braze and Brew field notes
Canonical: https://marketinginbox.dev/zh-Hans/posts/gen-209-a-b-braze

We ran a working session on A/B testing AI subject lines using Braze and Brew. The goal was a realistic week of campa...

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