Every email tool I've used hands you a blank canvas and a template library. You drag blocks around for two hours, squint at the preview, and ship it anyway — because there's no signal telling you whether the design actually works until the campaign is live and the click rate comes back flat.
I built kopi to fix the feedback gap. You write a brief, it generates a complete HTML email in under 5 minutes, and before you touch the export button every design gets scored across 12+ criteria — layout hierarchy, mobile readability, CTA contrast ratio, and more — on a 0–100 scale.
The scoring is the part worth dwelling on. A 93/100 email typically has one dominant CTA with sufficient contrast (the tool checks this mechanically, not by feel), a clear visual hierarchy where the headline size-to-body ratio guides the eye without relying on bold everywhere, and a mobile layout where tap targets don't collapse into each other below 375px. A 70/100 email usually has two competing CTAs of similar visual weight, a hero image that breaks on Outlook's rendering engine, or body copy at 13px that's technically readable but loses people on Android.
The public gallery at trykopi.ai/emails shows 400+ emails that scored 80 or above — useful as a reference for what the rubric rewards and why.
For teams already on Klaviyo, there's a direct export. For dev-side workflows, it runs as an MCP server for Claude Code, Cursor, and ChatGPT. It also learns brand-specific design systems — fonts, colors, layout preferences — so successive campaigns don't drift.
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