GO Feature Flag

A lightweight feature flag service you host yourself, with flags kept in plain files and SDKs from the OpenFeature standard.

2.1k stars, 231 forks Go On GitHub since December 2020

Visit website View on GitHub How to run it

GO Feature Flag at a glance

Open sourceYes, MITNo paid parts in the repository
Health81 of 100Actively developed
Self-hostingDocker, Helm chart, Desktop appsCompose file, 2 services
AppsWindows, Linux, macOS, including ARMBuilds in GitHub releases
InterfaceEnglish onlyNo translation files found
Issue repliesWithin ~34 hoursMedian first reply; 33% of recent issues answered

What is GO Feature Flag?

GO Feature Flag stores flag definitions in YAML, JSON or TOML files that can sit on HTTP, S3, Kubernetes and other backends. A small API server, the relay proxy, reads those files and evaluates flags for applications written in Go, Java, Kotlin, JavaScript, Python, .NET, Ruby, Swift, PHP and Rust through OpenFeature providers. Go programs can skip the proxy and evaluate flags in-process with the module. Rules target specific users, roll features out progressively, run A/B experiments and schedule changes. Usage data can be exported to S3, Google Cloud Storage, files or Kafka, and changes trigger webhook or Slack notifications.

Good fit if

  • You want feature flags without a hosted vendor and prefer to manage flag definitions as files in version control.
  • Your services span several languages and you want to stay on the vendor-neutral OpenFeature API.

Look elsewhere if

  • Non-developers need a web dashboard to toggle flags and manage remote config: Flagsmith.

Before you adopt it

The project is MIT-licensed, has no paid parts in the repository and asks for no CLA. It belongs to a personal account, and seven people committed in the last 90 days, the most active of them writing a little over half of the changes; the author asks for sponsorship. The relay proxy ships as a Docker image, as binaries for Linux, macOS and Windows, and through a Helm chart.

Drafted with AI from the project's README and repository data, then checked against that data on 10 November 2026. Report a correction

How to run GO Feature Flag yourself

One-click install

Not listed in the app catalogs of Umbrel, YunoHost, TrueNAS, Unraid, CasaOS, Runtipi, Proxmox VE Helper-Scripts and Coolify.

Ways to install

Docker files
Dockerfile or compose file in the repository
Docker image
thomaspoignant/go-feature-flag: 77.9k pulls · x86-64, ARMv7, ARM64 · 40 MB download
Compose file
examples/data_export_kafka/docker-compose.yml: 2 services (kafka)
Setup effort
3 of 5, judged from the compose file
Kubernetes
Helm chart in the repository
Desktop and mobile
Builds for Windows, Linux, macOS, including ARM in GitHub releases
Interface languages
English only

Install instructions: gofeatureflag.org or the README on GitHub. Docker images and packages are checked weekly.

GO Feature Flag health: is it still maintained?

81 of 100, actively developed

Release rhythmEvery ~8 daysLatest: v1.58.1, 9 November 2026
Issue repliesWithin ~34 hoursMedian first reply; 33% of recent issues answered
Bus factorMedium riskThe most active of 7 authors wrote 52% of recent commits
  • Activity
    537 commits in the last 90 days, the latest on 12 November 2026.
    30 / 30
  • Contributors
    7 people wrote the latest 100 commits; the most active wrote 52% of them.
    12 / 20
  • Releases
    15+ releases in the last 12 months; the latest, v1.58.1, on 9 November 2026.
    19 / 20
  • Replies to issues
    Maintainers answered 33% of recent issues, with a median first reply after 34 hours.
    12 / 20
  • Security practices
    OpenSSF Scorecard 8 of 10.
    8 / 10

Read from GitHub on 12 November 2026. How the score works

GO Feature Flag security

Security advisories are the vulnerabilities the maintainers disclosed on GitHub, with the versions that fix them; many advisories can mean careful disclosure as much as weak code. OpenSSF Scorecard checks how a project is developed and released: reviews, protected branches, pinned dependencies, signed releases. It does not audit the code itself.

Security advisoriesNone publishedNo advisories in the repository’s Security tab
OpenSSF Scorecard8 of 10How the project is built and released
Security policyYesExplains how to report a vulnerability
Signed releasesPartlyOnly some downloads can be checked against a signature

What each Scorecard check found

  • Contributor base10 / 10Contributors come from several organizations
  • Dangerous workflows10 / 10No risky patterns in GitHub Actions
  • Dependency updates10 / 10A tool such as Dependabot keeps dependencies up to date
  • Fuzzing10 / 10The code is fuzz-tested
  • License file10 / 10A license file is present
  • Maintained10 / 10Steady commits and issue activity in the last 90 days
  • Packaging10 / 10Releases are published as packages from CI
  • Security policy10 / 10Explains how to report a vulnerability
  • Static analysis10 / 10Code is scanned for bugs on every change
  • Tests in CI10 / 10Tests run on every pull request
  • Token permissions10 / 10CI tokens have only the rights they need
  • Binary files8 / 10A few compiled binaries are checked into the repository
  • Code review8 / 10Some changes are merged without review
  • Pinned dependencies8 / 10Some dependencies use fixed versions
  • Signed releases6 / 10Some releases are signed
  • Best-practices badge5 / 10Working towards the OpenSSF Best Practices badge
  • Branch protection3 / 10Rules on the main branch are partly enforced
  • Known vulnerabilities0 / 10Many open known vulnerabilities in the code or its dependencies

Advisories read from GitHub on 12 November 2026. From the OpenSSF Scorecard of 12 November 2026; checks that do not apply to GO Feature Flag are left out.

GO Feature Flag license: is it open source?

GO Feature Flag uses MIT, an open-source license approved by the OSI.

  1. December 2020First published on GitHub.
  2. TodayMIT.

GO Feature Flag for developers

Written in

  • Go 68%
  • JavaScript 15%
  • Python 11%
  • Kotlin 4%
  • CSS 1%
  • Other 1%

Getting involved

Good first issues1Open, labelled “good first issue”Contributing guideYesCONTRIBUTING.mdOpen issues17On GitHub
Authors, 90 days7Of the latest 100 commits
DonationsGitHub SponsorsListed on GitHub

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

Alternatives to GO Feature Flag

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Questions about GO Feature Flag

Is GO Feature Flag open source?

Yes. GO Feature Flag is published under MIT, an OSI-approved open-source license.

Is GO Feature Flag still maintained?

Its health score is 81 of 100 (actively developed). It had 537 commits in the last 90 days, the latest on 12 November 2026, and its latest release came out on 9 November 2026.

How do I run GO Feature Flag?

You can run it with the Docker image thomaspoignant/go-feature-flag, on Kubernetes with the Helm chart in the repository and as an app for Windows, Linux, macOS, including ARM. The README on GitHub has the exact steps.

What is GO Feature Flag written in?

GO Feature Flag is written mainly in Go (68% of the code), with JavaScript (15%) and Python (11%), by GitHub’s count of the repository.

What are the alternatives to GO Feature Flag?

Close alternatives in the Developer tools category include Flagsmith, HyperSwitch, Langfuse.