head to head · open source
Unleash vs Flagsmith
Unleash has 13,924 GitHub stars, 919 forks, 39 open issues and last shipped yesterday. Flagsmith has 6,638 stars, 595 forks, 711 open issues and last shipped yesterday. Unleash leads on adoption by 110% (13,924 vs 6,638 stars). Unleash is written in TypeScript under AGPL-3.0; Flagsmith is written in Python under BSD-3-Clause. Unleash has attracted 7% as many forks as stars, Flagsmith 9%. Flagsmith was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (feature-flags, feature-toggles), so they are genuine substitutes rather than adjacent tools.
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
| Unleash | Flagsmith | |
|---|---|---|
| GitHub stars | ★ 14K | ★ 6.6K |
| License | AGPL-3.0 | BSD-3-Clause |
| Written in | TypeScript | Python |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 919 | ⑂ 595 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Unleash if
- You weight community size — 14K stars and counting
- You want the AGPL-3.0 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 Unleash
Launch the live demo Try Unleash Enterprise for free What is Unleash? Unleash is a powerful open source solution for feature management. It streamlines your development workflow, accelerates software delivery, and empowers teams to control how and when they roll out new features to end users. With Unleash, you can deploy code to production in smaller, more manageable releases at your own pace. Feature flags in Unleash let you test your code with real production data, reducing the risk of negatively impacting your users' experience. It also enables your team to work on multiple features simultaneously without the…
read the full Unleash 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 Unleash or Flagsmith more popular?
Unleash has 13,924 GitHub stars and Flagsmith has 6,638. Unleash has the larger community by that measure.
Are Unleash and Flagsmith free?
Both are open source. Unleash is licensed under AGPL-3.0 and Flagsmith under BSD-3-Clause. Neither carries a licence fee.
What is the difference between Unleash and Flagsmith?
Unleash 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, Unleash or Flagsmith?
Choose Unleash if you want the larger community (13,924 stars) or its AGPL-3.0 licence terms. Choose Flagsmith if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.