> /v1/alternatives/optimizely
Open source alternatives to Optimizely[006]
Optimizely runs A/B tests, feature rollouts and personalisation experiments across websites and product experiences. Below are 6 self-hostable open source alternatives, ranked by GitHub popularity.
PostHog
Open-source product analytics, session recording, feature flagging and A/B testing
★ STARS
34.4k
⑂ FORKS
2.7k
Unleash
Open-source feature management platform
★ STARS
13.5k
⑂ FORKS
848
GrowthBook
Open source feature flagging and A/B testing
★ STARS
7.7k
⑂ FORKS
744
Flagsmith
Flagsmith is an open source feature flagging and remote config service. Self-host or use our hosted version at
★ STARS
6.3k
⑂ FORKS
519
FeatBit
Enterprise-grade feature flag platform that you can self-host. Get started - free.
★ STARS
1.8k
⑂ FORKS
140
Featurevisor
Feature flags, experiments, and remote config management with version control
★ STARS
800
⑂ FORKS
37
// EDITOR'S TAKE
GrowthBook is the closest replacement because it pairs feature flags with a real statistics engine that reads results straight from your warehouse. PostHog is more convenient if you want experiments, analytics and session replay in one place, while Unleash and Flagsmith are strong flag platforms whose experimentation depth is thin by comparison.
// FREQUENTLY ASKED
What is the best open source Optimizely alternative?
PostHog is the most popular open source Optimizely alternative by GitHub stars (34,351 stars). The other 5 options are ranked above.
Are these Optimizely alternatives self-hostable?
Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.
Are they free?
All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.