Feature flag platforms in 2026

Commercial feature flag platforms

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

Open-source feature flag platforms

Complete systems you can adopt 4

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.

   ★ 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.

   ★ 6.6k BSD-3-Clause Python Active, pushed today
3. 3
   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.

   ★ 2.6k Apache-2.0 Go Active, pushed 5 days ago
4. 4
   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.

   ★ 2k MIT C# Active, pushed today

Building blocks for your own system 5

1. 1
   Flipper flippercloud

   🐬 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.

   ★ 4k MIT Ruby Active, pushed today
2. 2
   Rollout fetlife

   Feature flippers.

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

   ★ 2.9k MIT Ruby Active, pushed 4 days ago
3. 3
   GO Feature Flag thomaspoignant

   GO Feature Flag is a simple, complete and lightweight self-hosted cloud native feature flag solution 100% Open Source — built on OpenFeature 🎛️

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

   ★ 2.1k MIT Go Active, pushed today
4. 4
   Togglz togglz

   Feature Flags for the Java platform

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

   ★ 1k Apache-2.0 Java Active, pushed 3 days ago
5. 5
   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.

   ★ 1k Apache-2.0 Go Active, pushed today

Lists, courses and other material 1

1. 1
   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.

   ★ 1.3k Apache-2.0 Gherkin Active, pushed today

All 30 open-source feature flags projects

Compared head to head

Looking for an alternative to

Open-source licenses

• Permissive: 29. Use it anywhere, including in closed products. You keep the copyright notice; Apache-2.0 also grants patent rights.
• Network copyleft: 1. Like GPL, and running a changed version as a web service counts as distributing it, so its users get the source too.

Languages

Go 6, TypeScript 5, Ruby 3, Rust 3, Python 2, C# 2, Java 2, Gherkin 1, JavaScript 1, PHP 1, Scala 1, Elixir 1, Swift 1 and Kotlin 1.