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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.

4 experiments
Winners, losers & inconclusive
Full statistical details
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+20.0%

General: Testing Strategy Optimization

Principle: Simple A/B limits the solution space. Exploring 4+ design directions dramatically increases the chance of finding a meaningful improvement. Use multivariate or multi-arm testing when prioritization bandwidth allows.

Testing StrategyCross-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
inconclusive

Homepage: Meta: Top Homepage CRO Patterns

Principle: The highest-ROI tests on homepages are usually structural (CTA placement, sticky nav, multi-step forms) rather than content changes. Copy matters most for nav labels and CTAs. Social proof works for social platforms but can backfire for professional services. Carousels consistently underperform static alternatives.

Testing StrategyCross-Industry

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