head to head · open source
GrowthBook vs Flagsmith
GrowthBook has 8,558 GitHub stars, 890 forks, 793 open issues and last shipped yesterday. Flagsmith has 6,638 stars, 595 forks, 711 open issues and last shipped yesterday. GrowthBook leads on adoption by 29% (8,558 vs 6,638 stars). GrowthBook is written in TypeScript under a custom or non-standard licence; Flagsmith is written in Python under BSD-3-Clause. GrowthBook has attracted 10% as many forks as stars, Flagsmith 9%. GrowthBook was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| GrowthBook | Flagsmith | |
|---|---|---|
| GitHub stars | ★ 8.6K | ★ 6.6K |
| License | Custom / other | BSD-3-Clause |
| Written in | TypeScript | Python |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 890 | ⑂ 595 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick GrowthBook if
- You weight community size — 8.6K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Flagsmith if
- You want the Flagsmith feature set and don't need the biggest community
- You prefer the BSD-3-Clause license terms
- Your stack matches Python
- You evaluated both and Flagsmith fits your workflow better
About GrowthBook
Open Source Feature Flags, Experimentation, and Product Analytics Create a free GrowthBook Cloud account to get started quickly. Or run it yourself with: Then visit View the full Self Hosting Instructions for more details. This pulls our prebuilt public Docker image and needs no registry credentials. If you instead build the image from the Dockerfile in this repo, its hardened base images come from Docker's dhi.io registry, which requires a one time docker login dhi.io with any free Docker account — see Building from source. Our Philosophy The top 1% of companies spend thousands of hours building their own in…
read the full GrowthBook overview →
About Flagsmith
Try our interactive demo Flagsmith is an Open Source Feature Flagging Tool to Ship Faster & Control Releases Change the way your team releases software. Roll out, segment, and optimise—with granular control. Stay secure with on premise and private cloud hosting. Feature flags: Release features behind the safety of a feature flag Make changes remotely: Easily toggle individual features on and off, and make changes without deploying new code A/B testing: Use segments to run A/B and multivariate tests on new features Segments: Release features to beta testers, collect feedback, and iterate Organisation management…
read the full Flagsmith overview →
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Frequently asked questions
Is GrowthBook or Flagsmith more popular?
GrowthBook has 8,558 GitHub stars and Flagsmith has 6,638. GrowthBook has the larger community by that measure.
Are GrowthBook and Flagsmith free?
Both are open source. GrowthBook has no licence declared in this registry, and Flagsmith is licensed under BSD-3-Clause. Both are free to self-host.
What is the difference between GrowthBook and Flagsmith?
GrowthBook is written in TypeScript and Flagsmith in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, GrowthBook or Flagsmith?
Choose GrowthBook if you want the larger community (8,558 stars) or its Custom / other licence terms. Choose Flagsmith if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.