Docs, tools, and articles in one place.

Install the script, plan a test, understand a method, and follow what changes in Probant.

Install and read

What is an A/B test? Definition, steps, and an exampleNov 12, 2026 · An A/B test compares two versions of a page on randomly assigned visitors. Definition, steps, duration, reading the result, and common mistakes.
Checking a test every day manufactures winnersNov 7, 2026 · A difference that looks significant one day can vanish the next. What peeking really costs, measured on simulated A/A tests.
The winner’s curse: why the announced gain falls shortNov 7, 2026 · On average, the winner of a test overstates its effect. How to correct for it before you promise a number to anyone.

“Edit on my site” no longer sends you back to “Plan and launch”: a test that isn’t saved yet is saved as a draft when you open your site, and you finish setting it up afterward without leaving the editor.
Drag the selected element in the preview to its new position; “Find an element” locates it by the page’s text or by a CSS selector, so you don’t have to look for it.
A change can apply to certain devices only: a shorter headline on mobile, reviews moved up on tablet, a block hidden on desktop. Use the “Devices” option in the “Element” tab and on each change in the list; the device is the one used for targeting, and elsewhere the change counts neither as not found nor as not displayed.
Editing on your site: the “Insert” tab offers the same ready-made blocks as the “Element” tab, in the colors of your page’s buttons, and what you typed stays in place if an error appears.

Create your workspace, or explore the demo first with data from a fictional store.