8 open-source Feature Flagging & Experimentation vendors.

Open-source software for Feature Flagging & Experimentation that you can self-host, with auditable source code — regardless of the developer's headquarters.

• ConfigCatEU sovereign

  Feature flag and configuration management platform with open-source SDKs and GDPR-compliant EU hosting by default.

  Hungary

• ConfiguSelf-hosted / open source

  Open-source configuration and feature flag management platform enabling teams to orchestrate environment variables, secrets and flags.

  Israel

• FeatBitSelf-hosted / open source

  French open-source (MIT) AI-native feature-flag and A/B-testing platform, founded 2021.

  France

• FlagsmithNon-EU vendor

  UK open-source feature-flag management platform with remote configuration, A/B testing and a self-hosting option.

  United Kingdom

• FliptSelf-hosted / open source

  Open-source (MIT/Fair Core) Git-native feature flag platform storing flags in version control and deploying via CI/CD pipelines.

  United States

• GrowthBookNon-EU vendor

  Open-source feature-flagging and A/B-testing experimentation platform with MIT license; primarily for product experimentation, not comprehensive CDP functionality. Backed by a real YC-funded company (GrowthBook Inc.), not a controlling-company-free project.

  United States

• SwitchboxSelf-hosted / open source

  US open-source feature-flag platform with CDN edge delivery and privacy-first SDKs.

  United States

• UnleashSelf-hosted / open source

  Norwegian open-source feature-management platform with gradual rollouts, A/B testing and kill switches; commonly self-hosted so evaluation stays local and no data leaves the customer's own infrastructure.

  Norway