Not all A/B tests produce useful insights. Most test micro-variations that yield noise. Here are the tests that consistently produced statistically significant results across multiple client sites.
1. Above-the-fold specificity
Headlines with a specific outcome outperformed generic benefit statements by 12–18%. "Get your Drupal 7 site to Drupal 11 in 6 weeks" outperforms "Modern Drupal Solutions for Enterprise".
2. Social proof placement
Moving testimonials above the CTA (rather than below) increased form submissions by 9% on average across 4 tests.
3. Form length
Every additional form field beyond 3 reduced completion rate by approximately 8%. A 7-field form performs 40% worse than a 3-field form for cold traffic.
4. CTA button copy
"Get a free quote" outperformed "Contact us" by 22%. "Start my project" outperformed "Submit" by 34%. First-person phrasing ("Get my quote") outperformed second-person by 8%.
