A/B Spy

See the A/B tests a website is running right now: every version of the headline, button and page, even the ones you aren't shown.

See what any website is testing right now. Big brands test everything: headlines, prices, buttons, hero images, whole landing pages. You normally see one version and never find out about the others. A/B Spy shows you all of them. Open any website and the icon tells you how many A/B tests are running. Click it for a plain-English answer, like "ASOS is testing 3 things right now", and then: • Every live test, in plain words, with the markets it runs in • Every version of each test: the new copy, images and colours, and where split tests send visitors • What each change does: "Hides the hero", "Changes a background colour", "Sends visitors to a new checkout" • Which version you got, and which ones everyone else might be seeing • Personalized content and changes shipped without a test, listed separately so you know what's a real test One click copies the whole list as plain text, ready for a competitor teardown, a Slack message or a client deck. Works with the main testing tools that run in the browser. When a site chooses versions on its own servers, A/B Spy tells you that too. Made for marketers, growth teams, CRO specialists, designers and founders who want to learn from what other companies are testing. Private by design: A/B Spy only reads test settings that websites already send to every visitor's browser. It has no server, no analytics and no account, and nothing it reads ever leaves your browser.