Developer tools · Updated October 2026
LaunchDarkly is a feature flag service for rolling out and testing features. If you would rather own your tools, here are 4 open source alternatives to LaunchDarkly, ranked by GitHub stars. Each one is free to use under its license, and you can read, change, and often self-host the code.
The most popular is Unleash with 13.9k stars, and the most recently updated is Flagsmith, with a commit on Oct 21, 2026.
| Project | Stars | License | Language | Last commit |
|---|---|---|---|---|
 Unleash | 13.9k | AGPL-3.0 | TypeScript | Oct 21, 2026 |
 GrowthBook | 8.5k | Other | TypeScript | Oct 21, 2026 |
 Flagsmith | 6.6k | BSD-3-Clause | Python | Oct 21, 2026 |
 Flipt | 4.9k | Other | Go | Oct 21, 2026 |
by Unleash
Open-source feature management platform
by growthbook
Open Source Feature Flags, Experimentation, and Product Analytics
by Flagsmith
Flagsmith is an open-source feature flag platform with remote config, experimentation, and self-hosted or cloud deployment options.
by flipt-io
Enterprise-ready, Git native feature management solution
By GitHub stars, Unleash is the most popular open source alternative to LaunchDarkly right now, with 13.9k stars, followed by GrowthBook and Flagsmith. The best fit depends on your setup, so compare their licenses, languages, and recent activity in the table above.
Yes. All 4 projects on this page are open source, so the software itself is free to use, study, and change. Some of them also sell a hosted version or paid support.
Flagsmith (last commit Oct 21, 2026), GrowthBook (last commit Oct 21, 2026), and Unleash (last commit Oct 21, 2026) have the most recent commits. Licenses on this list include AGPL-3.0 and BSD-3-Clause.
