# A/B testing AI subject lines: ActiveCampaign and Braze field notes
Canonical: https://marketinginbox.dev/de/posts/gen-34-a-b-activecampaign

We ran a working session on A/B testing AI subject lines using ActiveCampaign and Braze. The goal was a realistic wee...

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