Flagsmith

A feature flag and remote config platform for rolling out features to segments, running A/B tests and changing settings without a deploy.

6.6k stars, 595 forks Python On GitHub since June 2018

Visit website View on GitHub How to run it

Flagsmith at a glance

Open sourceYes, BSD-3-ClauseNo paid parts in the repository
Health77 of 100Actively developed
Self-hostingDockerCompose file, 4 services
InterfaceEnglish onlyNo translation files found
Release rhythmAlmost dailyLatest: v2.290.0, 5 November 2026

What is Flagsmith?

Flagsmith lets teams wrap new code in feature flags and switch them on or off remotely, per environment or per user segment. Remote configuration values change app behavior without shipping a release, and segments support beta programs plus A/B and multivariate tests. Organisations, projects and roles keep larger teams in order. SDKs cover more than 15 languages, including TypeScript, .NET and Java, and it works with OpenFeature, so switching providers later is easier. An MCP server and other integrations are available.

Good fit if

  • You want LaunchDarkly-style flags and experiments on your own infrastructure.
  • You release often and want to decouple deploys from feature launches.

Look elsewhere if

  • You need product billing tied to usage rather than feature rollout: Lago.

Before you adopt it

Flagsmith is BSD-3-Clause, and no paid parts were found in the repository; an Enterprise edition with support, a private cloud and a hosted cloud are sold separately. Development is busy and shared among several engineers. The full Compose stack includes PostgreSQL, Kafka and ClickHouse among its services.

Drafted with AI from the project's README and repository data, then checked against that data on 31 October 2026. Report a correction

How to run Flagsmith yourself

Docker
Dockerfile or compose file in the repository
Compose file
docker-compose.yml: 4 services (postgres)
Setup effort
3 of 5, judged from the compose file
Kubernetes
No Helm chart in the repository
Desktop and mobile
No app builds in GitHub releases
Interface languages
English only

Install instructions: flagsmith.com or the README on GitHub.

Flagsmith health: is it still maintained?

77 of 100, actively developed

Release rhythmAlmost dailyLatest: v2.290.0, 5 November 2026
Issue repliesNot measuredToo few recent issues from outside the team
Bus factorLow riskThe most active of 9 authors wrote 28% of recent commits
  • Activity
    382 commits in the last 90 days, the latest on 6 November 2026.
    30 / 30
  • Contributors
    9 people wrote the latest 100 commits; the most active wrote 28% of them.
    13 / 20
  • Releases
    15+ releases in the last 12 months; the latest, v2.290.0, on 5 November 2026.
    19 / 20
  • Replies to issues
    Too few recent issues from outside the team to measure, so this part gets a neutral score.
    10 / 20
  • Security practices
    No OpenSSF Scorecard for this repository yet, so this part gets a neutral score.
    5 / 10

Read from GitHub on 6 November 2026. How the score works

Flagsmith license: is it open source?

Flagsmith uses BSD-3-Clause, an open-source license approved by the OSI.

  1. June 2018First published on GitHub.
  2. TodayBSD-3-Clause.

Flagsmith for developers

Written in

  • Python 64%
  • TypeScript 32%
  • JavaScript 3%
  • SCSS 1%
  • HTML <1%
  • Other <1%

Getting involved

Contributing guideYesCONTRIBUTING.mdOpen issues608On GitHub
Authors, 90 days9Of the latest 100 commits

Language shares are GitHub’s count of the code in the repository.

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Questions about Flagsmith

Is Flagsmith open source?

Yes. Flagsmith is published under BSD-3-Clause, an OSI-approved open-source license.

Is Flagsmith still maintained?

Its health score is 77 of 100 (actively developed). It had 382 commits in the last 90 days, the latest on 6 November 2026, and its latest release came out on 5 November 2026.

How do I run Flagsmith?

You can run it with Docker. The README on GitHub has the exact steps.

What is Flagsmith written in?

Flagsmith is written mainly in Python (64% of the code), with TypeScript (32%), by GitHub’s count of the repository.

What are the alternatives to Flagsmith?

Close alternatives in the Developer tools category include Sentry, Gotify, Lago.