Developer tools
LaunchDarkly Foundation alternatives
2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.
The projects
Unleash/unleash★13,719 GitHub starsAGPL-3.0 licenceSelf-hosted feature management platform with server, SDKs, admin UI, and targeting rules.Open on GitHub ↗Flagsmith/flagsmith★6,500 GitHub starsBSD-3-Clause licenceOpen-source feature flagging and remote configuration service with APIs, SDKs, and a React admin UI.Open on GitHub ↗
What you give up either way
- Global scale and the operational effort to handle 50T+ evaluations/day
- Enterprise SLA and high-availability multi-region infrastructure (99.99% SLA)
- Wide official SDK and integrations catalog (25+ SDKs and 80+ integrations)
- Advanced experimentation, observability, and Guardian/enterprise controls
- AgentControl advanced features (LLM traces, online/offline evals, custom judges)
An open-source project doing the core job proves a replacement is possible. It does not prove it matches LaunchDarkly Foundation, and it does not prove anyone has run it for a month. How we decide.