Assembly Line

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.

Statsig is commercial feature flags software made by Statsig.

Made by
Statsig
Source code
Closed

Website

Judgement

What it is
Developer tool
What it does
Feature flags, A/B experiments, product analytics and session replay in one platform, with a generous free tier.
Adopt it when
A product team wants experimentation and flags with strong statistics without paying LaunchDarkly prices.
Watch out
OpenAI acquired Statsig in 2025, which raises questions about its future as an independent product.
Ready for
Production-ready
Runs as
Cloud service and library
What the license allows
Closed source: you use it under the maker's terms and cannot change or resell the code.

Judged on 2026-11-03 from the maker's description and Wikipedia. The license and age lines are worked out directly.

Open-source alternatives to Statsig

  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
    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
  4. 4
    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
  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.

    ★ 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 — 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
  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.

    ★ 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.

    ★ 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.

    ★ 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.

    ★ 1k Apache-2.0 Go Active, pushed today

Other 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
    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

Under it

Every program, Statsig included, runs on a microchip.

How compilers were built, back to punched paper tape

The description is the maker's own, quoted as written.