Choosing an A/B Testing Tool, After You Are Ready to Test

Most teams choose an A/B testing tool far too early. They compare editors and pricing and integrations, sign up, run one test on a page with a trickle of traffic, get a result that looks like a winner, ship it, and see nothing change. The tool was never the problem. The test was never valid to begin with.

So before the tool, the harder question.

First, are you actually ready to test?

An A/B test compares two versions and tells you which performs better, but only if it gathers enough data to be sure the difference is real and not noise. On low traffic, that certainty takes a long time, sometimes longer than the test is worth.

If a page gets a handful of conversions a week, a classic A/B test will spend months reaching a conclusion, if it ever does. On low traffic you are usually better off improving the page based on session replays and plain judgment, and saving testing for the pages with real volume.

The tool is the easy part. Having enough traffic to get an honest answer is the whole game.

What actually matters in a tool

Once you have the traffic, most tools can run the test. The features worth weighing are narrower than the marketing pages suggest:

• An editor you can use. Can you build a variant without waiting on a developer for every change?
• Targeting and segmentation. Can you test the right visitors, not all of them?
• Statistics you can trust. Does it report significance honestly, or nudge you to call winners early?
• Speed. Does the tool slow your page down? A flicker or a delay can quietly bias the very test you are running.

A short, honest shortlist

You do not need the exhaustive list, only a sense of the shape of the market.

• Optimizely and VWO are the established, full featured platforms. Powerful, and priced for teams with budget and volume.
• AB Tasty sits in similar territory, with a lean toward personalisation.
• Unbounce is built for landing pages specifically, and is a good fit if that is mostly what you test.

One note on an old favourite: Google Optimize was discontinued in 2023, so any guide that still recommends it is out of date. If you relied on it, you have already had to move.

Do not test tiny changes on tiny traffic. Testing a button colour on a page with a few conversions a week will teach you nothing, slowly. Reserve testing for meaningful changes on pages with the volume to answer honestly, and use judgment everywhere else.

Pick the tool last, once you know you have the traffic to run a fair test and the change is worth testing. Get that order right and the tool decision becomes easy, because almost any of them will do.