Check results without inflating false positive rates. Stop experiments early when significance is reached instead of waiting for a fixed sample size. Available in Statsig, Eppo, GrowthBook.

Reduce required sample size by 30-50% using pre-experiment covariate data. Same statistical power, fewer users, faster decisions. Statsig and Eppo lead here.

Automatically halt experiments that hurt retention, engagement, or revenue. Most tools require manual monitoring. Statsig catches negative impacts before they scale.