Every email marketing tool I've used hands you a blank canvas and a drag-and-drop editor. You spend an hour picking a layout, another hour tweaking the mobile view, ship it, and only find out the CTA blended into the background when your click rate comes back at 0.4%.
I built Kopi to front-load that feedback. You write a prompt — product, offer, tone — and it generates a complete HTML email in under 5 minutes. Before the file ever touches Klaviyo, it runs an automated design critique: layout hierarchy, mobile readability, CTA contrast, and 12 other criteria, scored 0–100. You know the email is structurally sound before it goes to a single subscriber.
The public gallery at trykopi.ai/emails has 400+ emails that scored 80 or above, which also doubles as a reference when you're not sure what a well-structured promotional email actually looks like at scale.
It also runs as an MCP server, so if you work out of Claude Code or Cursor, you can pipe it directly into your existing workflow without context-switching to a browser tool.
The thing I care most about: the score isn't decorative. A 62 on CTA contrast tells you the button color is too close to the background — it's a specific, fixable note, not a vibe check.
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