Most holdouts measure only shipped features. Ours measure everything—including failed experiments. This technical deep dive reveals why we chose reality over clean rooms, and how we built it.
Many teams ship features weekly but struggle to measure their true cumulative impact. Holdouts in GrowthBook provide a simple way to maintain a control group across multiple features, answering the critical question: What did all this shipping actually do to our key metrics?
Stop guessing what works and start knowing: A/B testing transforms hunches into data-driven decisions, turning every change on your website from a risky bet into a calculated experiment that can boost conversions without spending more on traffic.
GrowthBook 4.0 includes a huge number of new features and updates. Continue reading for a full list of changes.
GrowthBook provides you with 3 different types of experimentation for different purposes: Bandits for picking a winner among many, Safe Rollouts for releasing safely, and Experiments for learning.
A platform builder discovers why experimentation tools need to become more fluid. How MCP and conversational AI are creating experimentation's ambient era.
This June is our Launch Month! Every week, we’ll announce major new features and changes to GrowthBook that you can try out early, before the final release at the end of the month.
It’s estimated that over 40% of all new code is now written by AI and that trend is likely
Running a successful experimentation program isn’t just about analyzing results—it’s about seamlessly integrating experimentation into your team’
GrowthBook 3.4 is live! Streamline experimentation and automate workflows with Experiment Templates, Custom Fields, Shareable Experiments & more.
Imagine making every product decision with data, powered by the best A/B testing platforms of 2025. These tools have
Discover how Multi-Armed Bandits revolutionize A/B testing in GrowthBook. Learn to optimize experiments automatically, reduce opportunity costs, and make data-driven decisions faster.
In under two minutes, GrowthBook can be set up and ready for feature flagging and A/B testing, whether you use our cloud or self-host.
