A/B Test Analyzer
Compare conversion rates with intervals, uplift and adjusted significance.
Private by design
Your inputs stay on your device and are not sent to our servers. Optional usage analytics does not receive your files or tool inputs.
How to use A/B Test Analyzer
- Open or paste your data, or load the working sample.
- Choose columns and explicit processing rules. Review the proposed result and warnings.
- Download the chosen result dataset, JSON artifact or report; save a draft to continue later.
What are the limits of A/B Test Analyzer?
Binary conversions only: one independent outcome per visitor. Uses a two-sided pooled two-proportion z-test where expected successes and failures are at least five per arm, Wilson intervals, and Holm adjustment for multiple comparisons against one control. Small samples receive intervals but no z-test conclusion. Fixed-horizon assumptions exclude repeated peeking, selection bias and non-random allocation. Inputs stay in browser memory. No workbook is created. Table limits: 5 MB total text, 25,000 rows, 64 columns and 200,000 cells; expensive operations have stricter limits. Processing can be cancelled.