Answer · Conversion Engineering
Should I Test Headline or CTA First?
The short answer
CTA first, on most mid-market B2B sites. CTA changes have larger expected lifts (10-25%) and faster implementation. Headline tests are second priority; their lifts are typically smaller (5-15%) and headline writing requires more rounds to get right. Test the bigger lever first.
№ 01The longer answer
The decision is about expected effect size and implementation cost. CTA copy changes are 30-minute jobs with 10-25% expected lift. Headline changes can take 2-3 rounds of copy iteration with 5-15% expected lift. CTA wins on both dimensions for first test.
The exception: if your CTA copy is already strong (specific outcome, first-person possessive, tier-matched) and your headline is generic (“Welcome to [Company]. We’re passionate about…”), reverse the order. Test the bigger gap, not the bigger nominal lift.
On thin-traffic sites where neither test can complete in 4 weeks, prioritize the change that doesn’t require A/B testing to ship. Both CTA copy and headline changes are usually obvious enough that you can ship them based on audit + qualitative judgment, then measure pre/post.
Don’t test both at once unless you’re running a properly-designed multivariate test (MVT). Testing two changes simultaneously creates interaction effects you can’t cleanly disentangle. Test sequentially, ship the winner, then test the next change.
№ 02What if I want to test the whole hero?
Test the elements that matter most (CTA copy, then headline copy) individually. Testing “hero version A vs hero version B” with multiple changes at once tells you something works without telling you what.
№ 03Should I test images?
Images carry less conversion weight than copy on B2B pages. Unless your current image is actively wrong (smiley stock photo on an engineering-focused site), image tests are not the right first move.
№ 04How do I know if my CTA copy is already strong?
Two-question check: (1) Does the CTA name the specific outcome the visitor receives? (2) Does it use first-person possessive (“my”)? If both are yes, your CTA is already strong — move on to headline testing.
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