The A/B test library that
remembers everything
Analyze tests with statistical rigor, save every result, and stop re-running experiments that already failed. GrowthLayer is the institutional memory your experimentation program needs.
Built for CRO teams, growth teams, and agencies running A/B tests at scale. Free to start — no credit card required.
Everything your experimentation program needs
From one-off test analysis to a full team knowledge base.
Statistical rigor, instantly
Paste in your test data and get a clear verdict — significance, confidence intervals, and sample ratio mismatch checks in seconds.
A library that remembers
Every test your team runs gets saved, tagged, and searchable. Stop re-running experiments that already failed.
AI-powered insights
Surface patterns across hundreds of tests. Find out which hypotheses actually win on your site.
Director-level reporting
One-click reports that translate test results into revenue impact and executive-ready slides.
Bulk import
Connect Optimizely or import a CSV to get your entire test history into the library in minutes.
Google & Adobe Analytics
Pull traffic and conversion data directly from your analytics platform — no manual copy-paste.
How it works
- 01
Enter your test data
Input visitors and conversions for each variant, or connect your analytics platform to pull data automatically.
- 02
Get a clear verdict
See statistical significance, confidence intervals, revenue impact, and an AI interpretation — all in one view.
- 03
Save to your library
Tag the test, add your hypothesis, and save it. Every result becomes institutional knowledge your whole team can search.
See GrowthLayer in Action
From test analysis to executive reporting — here's what your team gets on day one.
Statistical Analysis
Get instant significance verdicts with confidence intervals, p-values, and sample ratio mismatch detection.
Test Library
Every experiment saved, tagged, and searchable. Build institutional memory your whole team can access.
AI-Powered Insights
Surface winning patterns across your test history. Know which hypotheses work before you run the next test.
Executive Reports
One-click reports that translate test results into revenue impact leadership actually reads.
No credit card required — see it for yourself in 60 seconds.
Start building your test library today
Free to start. No credit card required. Your first test analysis takes 60 seconds.
Get started free