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DevOps

Free and open-source LaunchDarkly alternatives

LaunchDarkly (Feature flags and experimentation platform) is a commercial product. These 3 tools do the same job and are free to use or to self-host.
Short answer: the best free alternatives to LaunchDarkly are Unleash, Flagsmith and GrowthBook. Self-hosting is free; you pay only for the server (a small VPS is about $4–6/mo). Licenses and prices checked 2026-10-01.
  1. 1
    Unleash

    Open-source feature flag management

    Feature flag server with SDKs; enterprise features are paid.

    Open source (AGPL-3.0 (core)) ·★ 14k GitHub stars · last commit 2026-10-07 · details

  2. 2
    Flagsmith

    Open-source feature flags and remote config

    Feature flags and remote config, self-hosted or cloud.

    Open source (BSD-3-Clause) ·★ 6.6k GitHub stars · last commit 2026-10-07 · details

  3. 3
    GrowthBook

    Open-source feature flags and A/B testing

    Feature flags plus A/B testing on your warehouse; enterprise folders are paid.

    Open source (MIT (core)) ·★ 8.5k GitHub stars · last commit 2026-10-07 · details

Want paid options too? See all LaunchDarkly alternatives or the full free alternatives list. Beyond developer tools, OSS Software lists more open-source LaunchDarkly alternatives.

FAQ

Is there a free alternative to LaunchDarkly?+

Yes. Unleash, Flagsmith and GrowthBook do the same job for free; Unleash, Flagsmith and GrowthBook are open source.

What is the best open-source alternative to LaunchDarkly?+

Unleash is the most starred on GitHub (14k stars). Feature flag server with SDKs; enterprise features are paid.

Open source: OSI-approved license. Free to self-host: the code is public and free to run yourself, with limits in the license.