A/B testing for teams that write their variations in code, not in a visual editor. Real JavaScript and CSS, in your repository, with results from an exact event ledger. We write about experimentation and statistics that refuse to overclaim.
Every A/B testing platform sells a visual editor to a marketer, and the engineer cleans up afterwards. On a headless build or a single page app that model breaks, and many teams have already banned third party scripts that rewrite the DOM after load.
ABTestly does the opposite. Each variation is real JavaScript and CSS. It lives in your repository and goes through the same review as any other change.
The measurement matters most. Assignment, exposure and conversion are three separate events on an exact ledger, confidence intervals are shown with the sample size, and no winner is declared before the decision boundary is crossed.
Our stack
Cloudflare Workers for the API and the snippet CDN. Cloudflare Pages for the dashboard and the marketing site. R2 and KV for event storage. TypeScript throughout. Paddle for billing, Resend for email.