Top pick · highest health
Flagsmith
Dashboard, API and SDKs for adding Feature Flags to your applications (alternative to LaunchDarkly).
★ 6.6k 355 commits / 90d ⟳ today BSD-3-Clause Docker
Category
Open source software development - feature toggle
A feature toggle in software development provides an alternative to maintaining multiple feature branches in source code. 6 self-hosted feature toggle tools are listed here, ordered purely by a repository health score that Repoly recomputes nightly. Flagsmith leads at 95/100 with 355 commits in the last 90 days and 6.6k stars, followed by Flipt (95) and Featbit (93). 6 of the 6 score 70 or above, 4 publish a Docker image, and the median health is 91. MIT is the most common licence, carried by 3 of them. Between them they stand in for Amplitude, LaunchDarkly, Mixpanel, Hotjar and Segment.
updated Oct 2026 6 tools ★ 56k stars 4 with Docker median 91
Best for…
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Most starred
40,516 stars on GitHub, the largest community in the category.
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Most active
539 commits in the last 90 days, the fastest-moving codebase here.
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Most permissive
BSD-3-Clause licence with health 95/100: the strongest option if you need to embed or fork commercially.
Ranked by health
Table view
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Flipt
Feature flag solution with support for multiple data backends (alternative to LaunchDarkly).
★ 4.9k 183 commits / 90d ⟳ yesterday GPL-3.0 Docker
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Featbit
Enterprise-grade feature flag platform that you can self-host.
★ 1.9k 61 commits / 90d ⟳ today MIT Docker
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PostHog
Product analytics, session recording, feature flagging and a/b testing that you can self-host (alternative to Mixpanel, Amplitude, Heap, HotJar, Optimizely).
★ 41k 17556 commits / 90d ⟳ today MIT
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Nona
Remote configuration and feature flag service with a single REST API, multiple environments, and official JavaScript and .NET clients (alternative to Firebase Remote Config).
★ 51 425 commits / 90d ⟳ 1 month ago Apache-2.0 Docker
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GO Feature Flag
Simple, complete, and lightweight feature flag solution (alternative to LaunchDarkly).
★ 2.1k 539 commits / 90d ⟳ today MIT
| # | ||||||
|---|---|---|---|---|---|---|
| 1 | Flagsmith Docker | 6.6k | 355 | BSD-3-Clause | today | |
| 2 | Flipt Docker | 4.9k | 183 | GPL-3.0 | yesterday | |
| 3 | Featbit Docker | 1.9k | 61 | MIT | today | |
| 4 | PostHog | 41k | 17556 | MIT | today | |
| 5 | Nona Docker | 51 | 425 | Apache-2.0 | 1 month ago | |
| 6 | GO Feature Flag | 2.1k | 539 | MIT | today |
How the feature toggle tools compare
Flagsmith and Flipt tie at 95/100. PostHog has the largest following at 41k stars, yet ranks #4 of 6, held back mostly by Docker support (no Docker image).
The most recent release is PostHog desktop-v0.61.881, published today. None of the measured options scores under 40. By stack, Go (2) and Python (1) are the most common. Flagsmith, Featbit, PostHog and 2 more are permissively licensed; Flipt is copyleft.
Software Development - Feature Toggle: common questions
What is the best open source feature toggle tool?
By Repoly's GitHub health score, Flagsmith at 95/100 (355 commits in 90 days, v2.288.2 from yesterday). Flipt is next at 95. The score measures maintenance, not features, so shortlist the top few and try them.
Which feature toggle tools are the most actively developed?
PostHog (17,556 commits in 90 days), GO Feature Flag (539 commits in 90 days) and Nona (425 commits in 90 days). Commit activity is 35 of the 100 health points, the largest single term.
Which feature toggle tools can I run in Docker?
4 of 6 publish a Docker image or Compose file, led by Flagsmith, Flipt, Featbit and Nona.
Which feature toggle tools have a permissive licence?
5 of 6: Flagsmith (BSD-3-Clause), Featbit (MIT), PostHog (MIT), Nona (Apache-2.0), GO Feature Flag (MIT). 1 are copyleft.
Which paid products can open source feature toggle tools replace?
Amplitude (PostHog ranks highest here), LaunchDarkly (Flagsmith ranks highest here), Mixpanel (PostHog ranks highest here), Hotjar (PostHog ranks highest here) and Segment (PostHog ranks highest here).
