A/B testing
Tests that tell you what happened, in plain words.
Test a change to a page, or a whole new page. Peekbird shows which variation wins, by how much, and how sure it is.
Free plan: 5,000 sessions a month, every feature. No card needed.

Ship “Size preselected”: it's a winner
It's up 12.4% on purchases, and that has held up for 14 days with enough data to trust it. It also improved revenue per visitor.
Purchases
Very likely realA3.1%B3.5% +12.4%Revenue per visitor
Likely realA$1.82B$2.07 +13.7%Average order value
Could be chanceA$58.70B$59.30 +1.0%
Everything a test needs, and nothing it doesn't
Change anything on the page
Write a variation in JavaScript and CSS, in an editor that checks it before it goes live. Headlines, layouts, prices on show, whole sections.
Or test a whole new page
Split-URL tests send part of your visitors to another page, and measure both the same way.
No flash of the old page
The snippet loads first and applies the variation before the page shows, so visitors never see it change.
Aim it at the right visitors
Audiences by device, country, new or returning, traffic source, UTM tags and your own attributes, combined with and/or.
Measure what matters to you
Page visits and clicks need no code. Custom events, and revenue from your orders: conversion rate, revenue and order value.
Results in plain language
Which variation leads, by how much, and how sure that is, with the uncertainty spelled out. And a clear "too early to tell" until it is.
Check it before anyone sees it
QA and preview links force a variation in your own browser. Your QA visits never count in the results.
Fair and steady splits
Choose how much traffic enters. A visitor sees the same variation on every visit, on every page.
Watch why, not just what
Every recording shows the variation its visitor saw, so you can watch the sessions behind either side of a test.
From idea to answer in four steps
- 1
Describe the change
Name the test, pick the pages it runs on, and write the variation, or point to the new page.
- 2
Choose who and what
Pick an audience and the goals that count: sign-ups, orders, revenue.
- 3
Preview, then start
Open each variation with a QA link, check the goals fire, and start it for real visitors.
- 4
Read the result
Peekbird tells you when there is a winner, and by how much, in words.

Experiment
In QAPreselect the most popular size
Variations
Who it's for
Goals