Signup: CTA Button Optimization
Hypothesis
If we test a similar change on our signup pages as tested, then our conversion metric will likely improve based on their implementation decision.
Test Results
Key Learning
Problem: The primary call-to-action on the signup isn't converting at its potential — design, copy, or placement may be the bottleneck.
What worked: implemented this UI change (Jun 18, 2019). Implementation suggests positive internal results
Takeaway: Even small lifts compound — across thousands of sessions, this adds up. CTA changes are fast to iterate — test variations of copy, color, size, and placement independently to maximize this.
How to Apply This to Your Site
This experiment demonstrated that signup: cta button optimization can improve conversions. The test was run on a signup page in the travel industry.
Before you test: Consider that cta tests typically require adequate traffic to reach statistical significance. Run your test for at least 2 full business cycles to account for weekly traffic patterns.
What Was Tested
Here is a perfectly simple optimization of a "Get started" button on 's host signup landing page. ran an experiment of a smaller vs larger button size. I know because I managed to capture two diverse screenshots with the same date stamp. :) More so, a few months later rolled out the later button to 100% of their traffic - hinting at a successful experiment outcome.
Methodology
Build On These Learnings
Save your own experiments, spot winning patterns across your test history, and stop repeating what's already been tried.
Related Experiments
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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.
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Context: The primary call-to-action on the listing isn't converting at its potential — design, copy, or placement may be the bottleneck.
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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.