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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.

260 experiments
Winners, losers & inconclusive
Full statistical details
inconclusive

Product: Inverted Or Consistent Button Styles

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

Product: Repeated Bottom Call To Action

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

Home landing: Local Headline

Context: The headline on the home landing may not resonate with what users actually care about or address their top objections.

Copy & MessagingCross-Industry
inconclusive

Checkout: Urgent Next Day Delivery

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

LayoutCross-Industry
inconclusive

Checkout: Trust Seals

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

Social ProofCross-Industry
inconclusive

Checkout: Checkout Flow Simplification

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

LayoutCross-Industry
inconclusive

Checkout: Add More For Extra Incentive

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

LayoutCross-Industry
inconclusive

Checkout: Complementary Upsell

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

LayoutCross-Industry
inconclusive

Checkout: Currency & Taxes

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

PricingCross-Industry
inconclusive

Product: Welcome Discount

Context: Coupon and promo code fields on products can distract users — they leave to hunt for codes, reducing completion rates.

PricingCross-Industry
inconclusive

Checkout: Autodiscounting

Context: Coupon and promo code fields on checkouts can distract users — they leave to hunt for codes, reducing completion rates.

PricingCross-Industry
inconclusive

General: Combined Social Signup & Login

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

LayoutCross-Industry
inconclusive

Product: Personalized Next Step

Context: A one-size-fits-all product experience underperforms compared to content tailored to the visitor's context and intent.

PersonalizationCross-Industry
inconclusive

Listing: Priming Step

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

General: Source Personalized Testimonial

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

Social ProofCross-Industry
inconclusive

General: Source Personalized Headline

Context: The headline on the general may not resonate with what users actually care about or address their top objections.

Copy & MessagingCross-Industry
inconclusive

General: Personalized Greeting Headline

Context: The headline on the general may not resonate with what users actually care about or address their top objections.

Copy & MessagingCross-Industry
inconclusive

Listing: Infinite Scrolling Or Pagination

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.

NavigationCross-Industry
winner

Checkout: Filled Or Ghost Buttons

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

CTACross-Industry
winner

Does Pinning a Mobile Checkout CTA Improve Conversion?

Sticky mobile CTAs can compress time-on-page meaningfully (~15% faster) without sacrificing engagement signals — users converted at a directionally higher rate AND moved through the page faster, suggesting reduced hesitation rather than rushed clicks. The result was shipped via 90/10 holdout monitoring rather than traditional 50/50 A/B inference — the high baseline (~85%) and limited mobile traffic made full A/B underpowered, so the team chose a holdout-validated rollout as the deliberate methodology. Bayesian P(variant > control) was ~0.90, supporting the directional ship call. Worth noting: external research flags sticky CTAs as context-dependent — they help when the primary action is buried below the fold, but can hurt on shorter pages where the original CTA is already visible.

CTAEnergy & Utilities

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