9 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.
- vendors scored
- 9
- European
- 3
- last checked
- 11 October 2026
Vendors, scored
Score per vendor: 0 = high exposure, 100 = sovereign
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- Sovereignty score 94 out of 100FeatBitFrance · Self-hosted / open sourceFrench open-source (MIT) AI-native feature-flag and A/B-testing platform, founded 2021.
- Sovereignty score 92 out of 100UnleashNorway · Self-hosted / open sourceNorwegian 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.
- Sovereignty score 82 out of 100ConfigCatHungary · EU sovereignFeature flag and configuration management platform with open-source SDKs and an optional EU-only data governance setting (global CDN delivery by default).
- Sovereignty score 77 out of 100ConfiguIsrael · Self-hosted / open sourceOpen-source configuration and feature flag management platform enabling teams to orchestrate environment variables, secrets and flags.
- Sovereignty score 71 out of 100SwitchboxUnited States · Self-hosted / open sourceUS open-source feature-flag platform with CDN edge delivery and privacy-first SDKs.
- Sovereignty score 69 out of 100FliptUnited States · Self-hosted / open sourceOpen-source (MIT/Fair Core) Git-native feature flag platform storing flags in version control and deploying via CI/CD pipelines.
- Sovereignty score 69 out of 100OpenFeatureUnited States · Self-hosted / open sourceOpen, vendor-neutral specification and SDKs for feature flagging, an incubating project of the CNCF (Linux Foundation, US).
- Sovereignty score 57 out of 100FlagsmithUnited Kingdom · Non-EU vendorUK open-source feature-flag management platform with remote configuration, A/B testing and a self-hosting option.
- Sovereignty score 49 out of 100GrowthBookUnited States · Non-EU vendorOpen-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.
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