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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.

78 experiments
Winners, losers & inconclusive
Full statistical details
inconclusive+22.5%

Product-listing: Plans Page: CTA Copy 'Select Plan' vs 'Order Now' Reduces Commitment Anxiety

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

CTAEnergy & Utilities
inconclusive+250.0%

Landing-page: Tipalti B2B FinTech: Research-Led Experimentation Lifts Lead-to-Opportunity from 5% to 24%

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

CTASaaS
inconclusive+150.0%

Homepage: Navex Global: Compliance SaaS Homepage and Demo Request Redesign

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

CTASaaS
inconclusive+55.0%

Landing Page: Labster: Virtual Lab SaaS Free Trial Sign-Up Optimisation

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

CTAEdTech
inconclusive+40.0%

Landing Page: Sierra Club: Donation Page Conversion Optimisation

Context: Without clear urgency signals, users delay their decision on the landing page, leading to drop-offs and abandoned sessions.

CTANonprofit
winner+80.0%

Homepage: Distinct CTA Color + First Fold Placement

Problem: The first screen of the homepage must immediately communicate value — if it doesn't, users bounce before scrolling.

CTACross-Industry
winner+25.0%

Landing: Pop-up Demo Request Form on High-Intent Page

Problem: How "Pop-up demo request form on high-intent page" is implemented on the landing can meaningfully affect conversion — this element is worth testing.

CTACross-Industry
winner+100.0%

Homepage: Above-the-Fold CTA Placement

Problem: The first screen of the homepage must immediately communicate value — if it doesn't, users bounce before scrolling.

CTACross-Industry
winner+100.0%

Homepage: Welcome Mat / Partial Interstitial

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

CTACross-Industry
winner+40.0%

Homepage: Bigger CTA Button in Navigation

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

CTACross-Industry
winner+32.5%

Homepage|landing: Sticky CTA Bar

Problem: Key actions on the homepage|landing disappear as users scroll, creating a gap between intent and the ability to act.

CTACross-Industry
winner+16.5%

Homepage: Repeated Bottom CTA on Long Pages

Problem: The primary call-to-action on the homepage 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
inconclusive-4.7%

Listing: Filled Or Ghost Buttons

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

CTACross-Industry
inconclusive

Listing: Visible Payment Options

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

CTACross-Industry
loser

Does Adding a Shopping CTA to the Main Navigation Drive Plan Views?

A CTA's click rate is not its conversion contribution. This test surfaced one of the most consistently underweighted patterns in CRO: behavioral diagnostics almost always tell a more honest story than the topline. The aggregate result looked like a tiny non-significant lift (+1%); the diagnostic revealed that of every 100 button clicks, only 6 reached the next funnel step. Two failure modes converged: (1) copy intent mismatch — the chosen label read as 'create account' rather than 'shop,' so a large share of clicks came from users trying to log in / manage their account from support and customer pages; (2) extra modal step before the destination page added friction without value. The aggregate lift was partially cannibalization from higher-converting paths. The transferable pattern: when introducing a global navigation element, validate the click→conversion ratio per source page, not just the topline. High clicks from low-intent pages creates a false signal of engagement that can mask poor performance.

CTAEnergy & Utilities
inconclusive

Product: Single Or Alternative 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
winner+4.0%

Checkout: Sticky Call To Action

Problem: Key actions on the checkout disappear as users scroll, creating a gap between intent and the ability to act.

CTACross-Industry
inconclusive

Checkout: Above The Fold Call To Action

Context: The first screen of the checkout must immediately communicate value — if it doesn't, users bounce before scrolling.

CTACross-Industry
inconclusive

Product: Shortcut 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

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