# thomaspoignant/go-feature-flag

GO Feature Flag is a simple, complete and lightweight self-hosted cloud native feature flag solution 100% Open Source — built on OpenFeature 🎛️

Repository: https://github.com/thomaspoignant/go-feature-flag
Canonical: https://ross.abutalabs.com/products/go-feature-flag
Homepage: https://gofeatureflag.org/
Language: Go
License: MIT
License Family: permissive
Topics: feature-flags, feature-toggles, feature-flag, feature-toggle, feature-toggling, continuous-delivery, continuous-deployment, continuous-testing, variants, toggles, experiments, beginner-friendly, help-wanted, golang-library, experimentation, go-feature-flag, open-feature, openfeature
Last push: 2026-08-26T01:04:31+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 86, longevity 100
- inputs: {"age_days": 2091, "days_push": 8, "days_rel": 15, "gap_med": 1.5, "n_releases_24m": 99}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2089, forks 214 (observed 2026-08-28T04:06:12.170461+00:00)

## What it is
GO Feature Flag is an open-source, OpenFeature-native feature flag management system that runs self-hosted on your own infrastructure with no database required. It supports file-based (YAML) flag configuration, gradual rollouts, targeting rules, usage data collection, and SDKs/providers for 16 languages and frameworks.

## Use cases
- self-host a feature flag service without a database
- roll out a new feature to 10% of users and increase gradually
- instantly roll back a feature with a kill switch
- target flags to specific user segments or environments
- evaluate feature flags in Go, Java, .NET, Android, iOS, React, or Angular apps
- collect usage analytics on which flags are being evaluated
- manage flags in YAML files integrated with my existing tooling

## When to choose
- you want a 100% open-source, vendor-lock-free feature flag solution
- you prefer self-hosting on infrastructure you already run with minimal setup
- you want OpenFeature standardization and multi-language SDK support
- you need gradual rollouts, targeting, and experimentation without per-seat pricing

## When to avoid
- you want a fully managed SaaS with a polished enterprise UI and support
- your team needs advanced analytics dashboards or A/B testing statistics out of the box
- you are not willing to run even a lightweight Docker container or relay-proxy

## Facets
- artifact type: service
- maturity: active
- function: feature-flags, configuration-management, sdk, self-hosted, deployment
- domain: developer-tools, web-development, apis
- platform: go, self-hosted, cross-platform, cli, browser, jvm, dotnet, python, rust
- tags: feature-flags, openfeature, a-b-testing, gradual-rollout, kill-switch, experimentation, relay-proxy, yaml-configuration, no-database, devops, automation, docker, web-server, android, ios, nodejs, swift

## Member repositories
- thomaspoignant/go-feature-flag (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:12.170461+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:55:40.156132+00:00, confidence not recorded.
  - readme: https://github.com/thomaspoignant/go-feature-flag (fetched 2026-08-28T04:06:12.170461+00:00, sha b65a92d508c7)
  - homepage: https://gofeatureflag.org/ (fetched 2026-08-29T10:35:34.517145+00:00, sha a5706cd7702e)
  - site_page: https://gofeatureflag.org/docs/sdk/client_providers/openfeature_android (fetched 2026-08-29T10:35:34.534384+00:00, sha d638218ef1a7)
  - site_page: https://gofeatureflag.org/docs/sdk/server_providers/openfeature_go (fetched 2026-08-29T10:35:34.536207+00:00, sha b9f99ecac96c)
  - site_page: https://gofeatureflag.org/docs/sdk/server_providers/openfeature_java (fetched 2026-08-29T10:35:34.538838+00:00, sha e03f1af0fab7)
  - site_page: https://gofeatureflag.org/docs/sdk/server_providers/openfeature_dotnet (fetched 2026-08-29T10:35:34.540699+00:00, sha 9894217ab26e)
  - site_page: https://gofeatureflag.org/docs/sdk/client_providers/openfeature_javascript (fetched 2026-08-29T10:35:34.526443+00:00, sha b78487526fd3)
  - site_page: https://gofeatureflag.org/docs/sdk/client_providers/openfeature_react (fetched 2026-08-29T10:35:34.528607+00:00, sha faeff3cc3a89)
  - site_page: https://gofeatureflag.org/docs/sdk/client_providers/openfeature_angular (fetched 2026-08-29T10:35:34.530590+00:00, sha 554268399675)
  - site_page: https://gofeatureflag.org/docs/sdk/client_providers/openfeature_swift (fetched 2026-08-29T10:35:34.532598+00:00, sha 1c5a0b42b093)
- Data as of 2026-08-30T08:39:29.467469+00:00.