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The A/B Test Library

Real experiments. Real outcomes. Actionable patterns. Browse A/B tests with problem-to-solution framing, results, and recommendations for what to test next.

24 experiments
Winners, losers & inconclusive
Full statistical details
inconclusive

Landing Page: Social Proof at Checkout Increases Orders; Social Proof at Top of Funnel Hurts

Context: Users on the landing page need validation from others before committing — without visible proof of success, they hesitate.

Social ProofFintech
inconclusive

Multiple: Thortful Greeting Cards: Experimentation Program Delivers 30x ROI

Context: Friction during the multiple process causes users to abandon right when they're closest to converting.

Testing StrategyE-commerce
inconclusive

General: Commonly Used Metrics Are Poor Predictors of Business Impact

Principle: Always tie test metrics to a revenue or retention outcome. Vanity metrics (CTR, bounce rate) are easy to move but rarely correlate with business results. Use downstream metrics wherever possible.

MeasurementCross-Industry
inconclusive

General: Test Quality Peaks at 1–10 Annual Tests Per Engineer; Drops 87% After 30

Principle: Use a prioritization framework (PIE, ICE, or custom scoring) before building a test. Quality hypothesis generation matters more than raw test velocity.

Testing StrategyCross-Industry

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