Assembly Line

Alternatives to Split in 2026

4 commercial products, led by Optimizely Feature Experimentation, LaunchDarkly and Statsig. 30 open-source projects you can run yourself, led by Unleash, Flagsmith and Flipper.

Open source

  1. 1
    Unleash Unleash

    Open-source feature management platform

    Complete system Production-ready Your engineering team wants a well-established self-hosted feature flag server.

    โ˜… 14k AGPL-3.0 TypeScript Active, pushed today
  2. 2
    Flagsmith Flagsmith

    Flagsmith is an open-source feature flag platform with remote config, experimentation, and self-hosted or cloud deployment options.

    Complete system Production-ready You want LaunchDarkly-style feature flags but need to self-host for data control or cost reasons.

    โ˜… 6.6k BSD-3-Clause Python Active, pushed today
  3. 3
    Flipper flippercloud

    ๐Ÿฌ Beautiful, performant feature flags for Ruby.

    Building block Production-ready You run a Ruby or Rails app and want feature flags stored in your own database.

    โ˜… 4k MIT Ruby Active, pushed today
  4. 4
    Rollout fetlife

    Feature flippers.

    Building block Production-ready Your Ruby app already uses Redis and you want very simple flags.

    โ˜… 2.9k MIT Ruby Active, pushed 4 days ago
  5. 5
    Flagr openflagr

    Flagr is a feature flagging, A/B testing and dynamic configuration microservice

    Complete system Usable You want a lightweight, self-hosted flag and experiment service called over HTTP from any language.

    โ˜… 2.6k Apache-2.0 Go Active, pushed 5 days ago
  6. 6
    GO Feature Flag thomaspoignant

    GO Feature Flag is a simple, complete and lightweight self-hosted cloud native feature flag solution 100% Open Source โ€” built on OpenFeature ๐ŸŽ›๏ธ

    Building block Usable You want feature flags without running a database-backed flag server, with flags stored as config files.

    โ˜… 2.1k MIT Go Active, pushed today
  7. 7
    FeatBit featbit

    Enterprise-grade feature flag platform that you can self-host. Get started - free.

    Complete system Usable You want a self-hosted feature flag platform and your team is comfortable with a .NET stack.

    โ˜… 2k MIT C# Active, pushed today
  8. 8
    Spec open-feature

    OpenFeature specification

    List, course or other material Production-ready You are building a flag provider or SDK, or want to understand the standard behind OpenFeature SDKs.

    โ˜… 1.3k Apache-2.0 Gherkin Active, pushed today
  9. 9
    Togglz togglz

    Feature Flags for the Java platform

    Building block Production-ready A Java or Spring application needs feature toggles managed in-process.

    โ˜… 1k Apache-2.0 Java Active, pushed 3 days ago
  10. 10
    Flagd open-feature

    A feature flag daemon with a Unix philosophy

    Building block Usable You want vendor-neutral feature flags through OpenFeature without buying a flag service.

    โ˜… 1k Apache-2.0 Go Active, pushed today
  11. 11
    Featurevisor featurevisor

    Feature flags, experiments, and remote config management with version control

    Developer tool Usable You want flag changes reviewed through pull requests and served from a CDN, without a flag server.

    โ˜… 814 MIT TypeScript Active, pushed today
  12. 12
    FeatureProbe FeatureProbe

    FeatureProbe is an open source feature management service. ๅผ€ๆบ็š„้ซ˜ๆ•ˆๅฏ่ง†ๅŒ–ใ€Ž็‰นๆ€งใ€็ฎก็†ๅนณๅฐ๏ผŒๆไพ›็‰นๆ€งๅผ€ๅ…ณใ€็ฐๅบฆๅ‘ๅธƒใ€ABๅฎž้ชŒๅ…จๅŠŸ่ƒฝใ€‚

    Complete system Usable You want a self-hosted feature flag service and can accept a project whose main community is Chinese-speaking.

    โ˜… 1.6k Apache-2.0 TypeScript Slowing, pushed 5 months ago
  13. 13
    Bucketeer bucketeer-io

    Feature Flag Management and A/B Testing platform

    Complete system Usable You want a self-hosted flag platform with built-in experiment statistics.

    โ˜… 485 Apache-2.0 Go Active, pushed yesterday
  14. 14
    Superposition juspay

    Superposition is a context-based configuration management system designed to facilitate safe and flexible rollout of config changes

    Complete system Usable You manage many context-dependent config values and want safe, experiment-driven rollouts of config changes.

    โ˜… 441 Apache-2.0 Rust Active, pushed yesterday
  15. 15
    Django Waffle django-waffle

    A feature flipper for Django

    Building block Production-ready You run a Django project and want flags stored in its own database.

    โ˜… 1.3k BSD-3-Clause Python Slowing, pushed 5 months ago
  16. 16
    Flopflip tdeekens

    ๐ŸŽšFlip or flop features in your React application in real-time backed by flag provider of your choice ๐Ÿšฆ

    Building block Usable Your React app uses a hosted flag provider and you want one abstraction over it.

    โ˜… 413 MIT JavaScript Active, pushed 2 days ago
  17. 17
    Feature flags ylsideas

    A Laravel package for handling feature flags

    Building block Usable You build a Laravel app and want flags beyond what Laravel Pennant offers, or already use this package.

    โ˜… 626 MIT PHP Slowing, pushed 6 months ago
  18. 18
    Unleash-node-sdk Unleash

    Unleash client SDK for Node.js

    Building block Production-ready Your Node.js services use Unleash for feature flags.

    โ˜… 226 Apache-2.0 TypeScript Active, pushed 5 days ago
  19. 19
    Izanami MAIF

    Izanami is a centralized versatile feature flag solution, well suited for micro service architectures.

    Complete system Usable You want a self-hosted flag server and are comfortable with a Scala and Postgres stack.

    โ˜… 206 Apache-2.0 Scala Active, pushed today
  20. 20
    Unleash-go-sdk Unleash

    Unleash client SDK for Go

    Building block Production-ready Your Go services use Unleash for feature flags.

    โ˜… 150 Apache-2.0 Go Active, pushed 3 months ago
  21. 21
    Unleash Java SDK Unleash

    Unleash client SDK for Java

    Building block Production-ready Your Java or Kotlin services use Unleash for feature flags.

    โ˜… 141 Apache-2.0 Java Active, pushed 4 days ago
  22. 22
    Dif dif-sh

    Feature flags and A/B tests as Markdown files in your repo. dif build compiles them to a typed TypeScript client for Next.js, React, and SvelteKit.

    Developer tool Experimental You want Git-only flags for a JavaScript front end with no dashboard or signup.

    โ˜… 115 MIT Rust Active, pushed 17 days ago
  23. 23
    Cargo-all-features frewsxcv

    A Cargo subcommand to build and test all feature flag combinations.

    Developer tool Usable You maintain a Rust library with optional features and want to catch broken combinations in CI.

    โ˜… 190 Apache-2.0 Rust Slowing, pushed 11 months ago
  24. 24
    Flipflop voormedia

    Flipflop lets you declare and manage feature flags in your Rails application.

    Building block Usable You run a Rails app and like declaring features in code with a built-in dashboard.

    โ˜… 185 MIT Ruby Slowing, pushed 3 months ago
  25. 25
    FunWithFlags tompave

    Feature Flags/Toggles for Elixir

    Building block Production-ready You build in Elixir or Phoenix and want flags without an external service.

    โ˜… 1.2k MIT Elixir Quiet, pushed 14 months ago
  26. 26
    Vexil unsignedapps

    Vexil (named for Vexillology) is a Swift package for managing feature flags (also called feature toggles) in a flexible, multi-provider way.

    Building block Usable You build iOS or macOS apps and want strongly typed flags that can be backed by several sources.

    โ˜… 125 MIT Swift Slowing, pushed 6 months ago
  27. 27
    Feature-flag-android line

    A Gradle plugin to achieve feature flag based development for Android applications.

    Developer tool Usable You want build-time flags to hide unfinished features in Android release builds.

    โ˜… 114 Apache-2.0 Kotlin Slowing, pushed 10 months ago
  28. 28
    FeatureToggle jason-roberts

    Simple, reliable feature toggles in .NET

    Building block Experimental Only if you maintain an existing .NET app that uses it.

    โ˜… 694 Apache-2.0 C# Quiet, pushed 5 years ago
  29. 29
    Flagged sergiodxa

    Feature Flags for React made easy with hooks, HOC and Render Props

    Building block Usable You already have flag values and want a tiny way to use them in React components.

    โ˜… 435 MIT TypeScript Quiet, pushed 12 months ago
  30. 30
    Feature flags AntoineAugusti

    Feature flags API written in Go

    Building block Experimental Only as example code for a minimal flag service.

    โ˜… 386 MIT Go Quiet, pushed 8 years ago

Commercial

  1. 1
    Optimizely Feature Experimentation Optimizely

    Innovate your whole product lifecycle with higher quality releases, safer tests, and faster feature validations.

    Developer tool Production-ready A product organisation runs many experiments and wants rigorous statistics alongside feature rollouts.

    Commercial
  2. 2
    LaunchDarkly LaunchDarkly

    LaunchDarkly helps teams safely manage code and AI agents in production with feature flags, progressive delivery, automated rollback, and runtime control.

    Developer tool Production-ready A larger engineering organisation ships continuously and needs controlled rollouts with audit and governance.

    Commercial
  3. 3
    Statsig Statsig

    Statsig is your modern product development platform, with an integrated toolkit for experimentation, feature management, product analytics, session replays, and much more. Trusted by thousands of companies, from OpenAI to series A startups.

    Developer tool Production-ready A product team wants experimentation and flags with strong statistics without paying LaunchDarkly prices.

    Commercial
  4. 4
    ConfigCat ConfigCat

    ConfigCat is a feature flag service with unlimited seats, awesome support, and a reasonable price tag.

    Developer tool Production-ready A small or mid-size team wants simple feature flags at a predictable price.

    Commercial

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