You wrote your landing page copy once. Maybe you tweaked it. But you've never actually tested whether different words would get more clicks. Until now.
Three steps. No code changes. No broken pixels.
WhichCopy reads your page and pulls out every headline, subhead, and CTA. You see exactly what copy is on your site right now.
We generate a conversion-focused rewrite of your messaging. Same product, same facts — just clearer, tighter words. You review and edit everything before it goes live.
Paste a script tag on your site. Half your visitors see the original, half see the new version. WhichCopy tracks which copy drives more clicks — on your real domain, with your real traffic.
See it in action
One script tag. No iframes, no redirects, no cloned pages. Here's exactly what happens when a visitor lands on your site.
Each visitor is assigned A or B via a first-party cookie on your domain. Returning visitors always see the same variant. No flicker, no inconsistency.
The snippet only changes text content — headlines and CTA labels. It never touches your layout, styles, images, or page structure. Variant A visitors see your page completely untouched.
Works with Next.js, Framer, Webflow, and other tools that hydrate the DOM after initial load. The snippet watches for DOM changes and reapplies copy swaps automatically.
Tracks page views and CTA clicks via sendBeacon — the same method analytics tools use. No cookies beyond variant assignment. No personal data collected.
Tests run on your actual domain. Facebook pixels, Google Analytics, UTM parameters, retargeting — everything keeps working exactly as before.
If the snippet can't reach our API, or your test isn't active, it does nothing. Your page loads normally with zero errors. No risk to your live site.
The snippet is async, under 3KB, and adds no visible load time to your page.
Not another enterprise tool you'll never finish setting up
WhichCopy is a message testing layer that sits on top of your site. It doesn't rebuild your page. It tests whether different words perform better.
One test can tell you more about your copy than a month of staring at it.