Flagsmith vs Unleash
Flagsmith and Unleash are both feature flags software. Flagsmith is open source under BSD-3-Clause, with 6.6k GitHub stars. Unleash is open source under AGPL-3.0, with 14k GitHub stars.
Which to pick
- Pick Flagsmith when
- You want LaunchDarkly-style feature flags but need to self-host for data control or cost reasons.
- Pick Unleash when
- Your engineering team wants a well-established self-hosted feature flag server.
Side by side
A feature flag and remote config service with user segments, A/B testing and SDKs for 15+ languages, available as self-hosted open source or a hosted cloud.
A feature flag platform with activation strategies, gradual rollouts, variants for experiments and SDKs for many languages, self-hosted or as Unleash's cloud.
Some features such as SSO and audit logs sit in the paid Enterprise edition.
The open-source edition lacks features such as change requests and SSO that are in paid Enterprise, and the server is AGPL-3.0.
Production-ready (both)
Self-hosted server and cloud service (both)
Python, Django, TypeScript and PostgreSQL
TypeScript, Node.js and PostgreSQL
Open source, BSD-3-Clause (permissive)
Open source, AGPL-3.0 (network copyleft)
You can build it into a product you sell, as long as you keep its copyright notice.
Use inside your business is unrestricted. If you change it and let customers use it over the internet, you must publish your changes.
6.6k GitHub stars
14k GitHub stars
Established: started 8 years ago, latest release v2.288.2.
Established: started 12 years ago, latest release v8.3.1.
Other comparisons
More feature flag platforms
Both sides were judged on 2026-11-03 from each project's README and GitHub data. License, age and popularity lines are worked out directly.