Flagr vs Flagsmith
Flagr and Flagsmith are both feature flags software. Flagr is open source under Apache-2.0, with 2.6k GitHub stars. Flagsmith is open source under BSD-3-Clause, with 6.6k GitHub stars.
Which to pick
- Pick Flagr when
- You want a lightweight, self-hosted flag and experiment service called over HTTP from any language.
- Pick Flagsmith when
- You want LaunchDarkly-style feature flags but need to self-host for data control or cost reasons.
Side by side
A Go microservice for feature flags, A/B tests and dynamic configuration that returns a variant per entity through an evaluation API, with a web UI.
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 small community-maintained fork after Checkr stepped back.
Some features such as SSO and audit logs sit in the paid Enterprise edition.
Usable
Production-ready
Self-hosted server
Self-hosted server and cloud service
Go, Vue and PostgreSQL
Python, Django, TypeScript and PostgreSQL
Open source, Apache-2.0 (permissive)
Open source, BSD-3-Clause (permissive)
You can build it into a product you sell, as long as you keep its copyright notice. (both)
2.6k GitHub stars
6.6k GitHub stars
Established: started 9 years ago, latest release 1.2.4.
Established: started 8 years ago, latest release v2.288.2.
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.