head to head · open source
Unleash vs Flagsmith
Unleash has 13,811 GitHub stars, 896 forks, 39 open issues and last shipped yesterday. Flagsmith has 6,559 stars, 568 forks, 711 open issues and last shipped yesterday. Unleash leads on adoption by 111% (13,811 vs 6,559 stars). Unleash is written in TypeScript under AGPL-3.0; Flagsmith is written in Python under BSD-3-Clause. Unleash has attracted 6% 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 | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 896 | ⑂ 568 |
| 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
Unleash is an open source feature management platform written in TypeScript and released under the AGPL 3.0 license. It lives in the DevOps, continuous delivery, and application security ecosystem, and its topics describe feature flags, feature toggles, activation strategies, experiments, and collaboration.
read the full Unleash overview →
About Flagsmith
Flagsmith is an open source feature flag and remote configuration platform, written in Python and released under the BSD 3 Clause licence, for engineering teams that need to toggle, segment and roll out features across web, mobile and server side applications without deploying new code.
read the full Flagsmith overview →
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Frequently asked questions
Is Unleash or Flagsmith more popular?
Unleash has 13,811 GitHub stars and Flagsmith has 6,559. 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 (13,811 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.