GrowthBook
MIT-core flags+experiments; Cloud Starter Free, self-host unlimited users
Observability / Feature Flags · Freemium · 8.3k
What's Good
MIT core. Cloud Starter Free — no CC — unlimited flags/experiments (3 users / 1 project). Self-Hosted OSS unlimited users. Experiment stats engine included. Do not reprint Pro seat prices.
The Catch
Warehouse-native experimentation competitor to PostHog — different pitch (flags+experiments first). Cloud Starter Free has user/project caps; self-host OSS uncapped users. Distinct from PostHog.
Verdict
MIT-core flags+experiments. Cloud Starter Free is real; ignore Pro seats.
Embed
[](https://stackgems.com/gems/growthbook)