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Flagsmith

Open-source feature flag and remote config service

Web Analytics ★ 6.6k stars Medium setup BSD-3-Clause

Flagsmith is an open-source feature flag and remote configuration service that can be fully self-hosted. It supports segmentation, multivariate flags, and A/B testing analytics.

Official siteSource code

Key features

  • Feature flags
  • Remote config
  • Segmentation rules
  • A/B test analytics

Strengths

  • Released under the BSD-3-Clause license
  • First-class Docker support for quick deployment
  • Kubernetes-ready with Helm charts available
  • Mature project with 6.6k GitHub stars

Is Flagsmith secure?

No known vulnerabilities affect Flagsmith's latest release (v2.284.0). OSV.dev lists 2 past advisories for the project; none of them applies to this release. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

  • Most recent fixed advisory CVE-2024-52871, published 2024-11-17 (696 days ago), fixed in 2.134.1

Source: OSV.dev, checked 2026-10-14. How this is measured.

Flagsmith replaces

Self-hosted LaunchDarkly alternatives

Health badge

Maintain Flagsmith? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 93 · excellent

Markdown
[![SelfHostIndex health score for Flagsmith](https://selfhostindex.com/badge/flagsmith-flags.svg)](https://selfhostindex.com/app/flagsmith-flags/)
HTML
<a href="https://selfhostindex.com/app/flagsmith-flags/"><img src="https://selfhostindex.com/badge/flagsmith-flags.svg" alt="SelfHostIndex health score for Flagsmith"></a>
reStructuredText
.. image:: https://selfhostindex.com/badge/flagsmith-flags.svg
   :alt: SelfHostIndex health score for Flagsmith
   :target: https://selfhostindex.com/app/flagsmith-flags/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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