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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.

141 experiments
Winners, losers & inconclusive
Full statistical details
inconclusive

Checkout: Single Or Double Column Form Fields

Context: Each additional form field adds friction to the checkout, increasing the chance users abandon before completing their submission.

FormCross-Industry
inconclusive

Checkout: Confirmed Selection

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

LayoutCross-Industry
inconclusive

Product: Unit Prices

Context: How prices are displayed on the product directly influences perceived value and willingness to buy.

PricingCross-Industry
inconclusive

Product: Bottom Or Left Thumbnails

Context: Visual elements on the product aren't doing enough to communicate value, build trust, or guide users toward the next step.

ImageryCross-Industry
inconclusive

Signup: Vague Or Specific Benefits

Context: The registration experience on the signup asks too much too soon, causing potential users to drop off.

Copy & MessagingCross-Industry
inconclusive

Checkout: Standard Or Superscript Price Format

Context: How prices are displayed on the checkout directly influences perceived value and willingness to buy.

FormCross-Industry
inconclusive

Signup: Right Or Left Aligned Forms

Context: The registration experience on the signup asks too much too soon, causing potential users to drop off.

FormCross-Industry
inconclusive

Home landing: Visible Or Hidden Offer Pages

Context: Multi-step processes on the home landing can overwhelm users if they can't see how far along they are or how much is left.

PricingCross-Industry
inconclusive

Product: Registration Flow Change

Context: The registration experience on the product asks too much too soon, causing potential users to drop off.

Social ProofCross-Industry
inconclusive

Product: One Time Payment Copy

Context: How prices are displayed on the product directly influences perceived value and willingness to buy.

PricingCross-Industry
inconclusive

Listing: Product Availability

Context: Multi-step processes on the listing can overwhelm users if they can't see how far along they are or how much is left.

LayoutCross-Industry
inconclusive

Checkout: Optional or Confident Recommendation

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

LayoutCross-Industry
inconclusive

Product: Product Categories

Context: Users can't quickly find relevant products or content on the product, leading to frustration and early exits.

LayoutCross-Industry
inconclusive

Product: Earliest Availability

Context: Multi-step processes on the product can overwhelm users if they can't see how far along they are or how much is left.

LayoutCross-Industry
inconclusive

Listing: Visible Filters

Context: Users can't quickly find relevant products or content on the listing, leading to frustration and early exits.

NavigationCross-Industry
inconclusive

Product: Page Level Navigation

Context: Users arriving at the product can't efficiently find what they're looking for, increasing bounce rates.

NavigationCross-Industry
inconclusive

Product: Product Descriptions

Context: Multi-step processes on the product can overwhelm users if they can't see how far along they are or how much is left.

LayoutCross-Industry
inconclusive

Product: Square or Rounded Buttons

Context: The primary call-to-action on the product isn't converting at its potential — design, copy, or placement may be the bottleneck.

CTACross-Industry
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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