Create an A/B test variant of a marketing email

Create an A/B test variant of a marketing email

Works with AI assistants

Use HubSpot: its Marketing Emails API lets you create an A/B test variant of a marketing email in a single step (POST /marketing/emails/2026-09/ab-test/create-variation). HubSpot also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.

• How do I set up an A/B test on a marketing email in HubSpot?
• Can I add a B version to a marketing email so I can test two subject lines?
• What happens if the email I want to A/B test already has an active variation?

Say it to your AI assistant

• Create an A/B test variation of marketing email {contentId} called {variationName}.
• Start an A/B test on email {contentId} by drafting a second version of it.

For your developer

POST /marketing/emails/2026-09/ab-test/create-variation in Marketing Emails API. Full spec on APIs.io.