30 A/B Testing & CRO Stats Every Optimizer Should Know in 2026 (With Original Convert Data)

If you’re running A/B tests in 2026, you’re part of a pretty exclusive club. Less than 0.2% of all websites even experiment at all. But among the sites that do test, the gap between going through the motions and compounding results is massive. We pulled together 30 stats on CRO and experimentation, including original data