Experiments in PostHog Web

The PostHog web app is where experiments are designed, launched, and read. Open Experiments to see every draft, running, and completed test in your project, then open one to configure its variants and metrics, watch exposures accumulate, and see whether the result is significant.

Because the experiment sits next to the rest of your PostHog data, the results view isn't just a number. You can jump from a variant to the session replays of the people who saw it, or break a metric down by any property you already capture.

What you can do here

• Create an experiment – define your hypothesis, variants, and metrics, and let PostHog create the backing feature flag.
• Test and launch – verify your implementation with variant overrides before you expose real users.
• Analyze results – read significance, credible or confidence intervals, and per-variant metric breakdowns.
• Manage the lifecycle – pause, resume, end, ship a winning variant, or archive a finished test.
• Run no-code web experiments – change copy, styles, or images on your site from the toolbar, with no deploy.
• Analyze with PostHog AI – create experiments, summarize results, and compare behavior across variants in natural language. It's an interaction mode inside the web app, not a separate surface.

Related

• Learn how users are assigned and counted in exposures and traffic allocation.
• Understand how the numbers are produced in Bayesian and frequentist statistics.
• Do the same work from your editor over MCP.