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Open Source Feature Flag Tools using JavaScript

A curated collection of the best open source platforms for managing feature flags, A/B testing, and gradual rollouts. using JavaScript.

Unleash

Feature flags for rapid, risk-free software deployment

  • Stars

    13,924

  • Last commit

    12 hours ago

  • License

    AGPL-3.0
A powerful feature management platform enabling gradual rollouts, A/B testing, and seamless integration for continuous delivery.

Open Source Alternative to:

LaunchDarkly

GrowthBook

Open-source A/B testing and feature flagging platform

  • Stars

    8,558

  • Last commit

    8 hours ago

  • License

    MIT
Powerful, developer-friendly experimentation tool for data-driven product decisions. Seamless integration, real-time insights, and flexible deployment.

Open Source Alternative to:

LaunchDarkly

Flagsmith

Feature flags and remote config for rapid deployment

  • Stars

    6,638

  • Last commit

    8 hours ago

  • License

    BSD-3-Clause
Powerful feature management platform for seamless software releases, A/B testing, and personalized user experiences.

Open Source Alternative to:

LaunchDarkly

Flipt

Git-native feature management for developers

  • Stars

    4,935

  • Last commit

    4 days ago

  • License

    GPL-3.0
A feature flag platform that integrates with Git workflows, enabling developers to manage features directly in their codebase.

Open Source Alternative to:

LaunchDarkly

FeatBit

Open-source feature flag management for seamless deployments

  • Stars

    1,954

  • Last commit

    17 hours ago

  • License

    MIT
FeatBit is a fast, scalable feature flag service that enables risk mitigation and fosters business growth through controlled feature releases.

Open Source Alternative to:

LaunchDarkly

Featurevisor

Feature management with GitOps for developers

  • Stars

    814

  • Last commit

    1 day ago

  • License

    MIT
Featurevisor is an open-source tool for managing feature flags, experiments, and remote configuration directly from your Git repository.

Open Source Alternative to:

LaunchDarkly

Abby

Type-safe feature flags and remote config for developers

  • Stars

    167

  • Last commit

    1 year ago

  • License

    AGPL-3.0
Abby offers open-source, fully typed feature flagging and remote configuration for React and Next.js, with multi-environment testing and debugging tools.

Open Source Alternative to:

LaunchDarkly
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