Open Source Feature Flags
Try open source feature flag management with full transparency and no vendor lock-in
Try feature flag management on your terms
Get started and see whether Flagsmith works for your needs.
Full transparency. Contribute on GitHub, view the roadmap, and communicate with our team.
Built-in testing and community. Open source feature flags tested and used by global dev teams.
No vendor lock-in. We partner with OpenFeature and our open source version is always available.
Open source feature flags
Flagsmith makes it easy to create and manage open source feature flags across web, mobile, and server side applications.
Segmentation
Segmentation lets you target flags and releases based on your user base. Run phased rollouts, beta testing, and more.
Integrate with your stack
Integrate Flagsmith with the tools you and your teams already use (e.g. observability, CI/CD, analytics, and so on). Keep your decision points where they are.
Our open source licensing and ethos
The vast majority of the platform is open source. View our GitHub.
Most of the platform is under the BSD-3-Clause license. A small number of repositories are under the MIT license.
We built Flagsmith as an open source feature flag tool we needed and couldn't find on GitHub. Core functionality stays open, always.
Use cases for open source feature flags
Decouple deploy and release
Achieve continuous deployment by deploying behind flags, and then only toggling them on when a release is scheduled.
Canary Deployments
Using Flagsmith, you can release new features to a small percentage of your users initially, and then enable them for the rest of your users over time.
A/B/n Testing
Once you’ve integrated the Flagsmith SDK and gated a feature with a flag, you can then easily use that flag to power A/B/n tests.
Enterprise/open source differences
Core feature flag functionality is open source. (Flags, segments, identities, etc.)
Several enterprise-level management features are not open source.
The licensing for each repository is clearly shown in GitHub.
Remote config
With Flagsmith’s open source remote config capabilities, you can change or test out different feature properties without deploying new code.
Configure different elements of your features – like the font size of a header or color of a CTA button – directly through Flagsmith and release the changes to users in just a few clicks.
Open source feature flags let you get started and test the tool on your terms. There's also full transparency with open source, built-in testing by devs around the globe, and the ability to contribute or communicate with our dev team on the Flagsmith GitHub.
Yes! Here are our guidelines for contributing to open source feature flags. If you have any questions about your contribution, you can also chat with us on Discord.
Our core functionality stays open. This means you can use open source feature flags and feature management no matter what. Several of our enterprise-level management features are not open source, but they are source available. You can read more about our build decisions here.
OpenFeature is an open specification that offers a vendor-agnostic, community-driven API for feature flagging that works with feature flag management tools (like Flagsmith) or in-house solutions. We're proud to partner with OpenFeature and offer OpenFeature providers to prevent vendor lock-in at the code level.
Open source feature flags are used by development teams around the globe
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