head to head · open source
Cap vs Flagsmith
Cap has 7,798 GitHub stars, 579 forks, 10 open issues and last shipped 2 days ago. Flagsmith has 6,559 stars, 568 forks, 711 open issues and last shipped yesterday. Cap leads on adoption by 19% (7,798 vs 6,559 stars). Cap is written in JavaScript under a custom or non-standard licence; Flagsmith is written in Python under BSD-3-Clause. Cap 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.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
← all 8884 open source comparisons
Side by side
| Cap | Flagsmith | |
|---|---|---|
| GitHub stars | ★ 7.8K | ★ 6.6K |
| License | Custom / other | BSD-3-Clause |
| Written in | JavaScript | Python |
| Last push | 2026-09-16 | 2026-09-17 |
| Forks | ⑂ 579 | ⑂ 568 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cap if
- You weight community size — 7.8K stars and counting
- You want the Custom / other license terms
- Your stack matches JavaScript
- 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 Cap
Cap is a free, open source, self hosted CAPTCHA replacement that swaps visual puzzles for proof of work and instrumentation challenges, built for developers and site operators who want anti bot protection without shipping their visitors' data to a third party service.
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 →
More in Security & Privacy
Related comparisons
More Application Security projects
Compare either of these against the rest of the Application Security field.
Frequently asked questions
Is Cap or Flagsmith more popular?
Cap has 7,798 GitHub stars and Flagsmith has 6,559. Cap has the larger community by that measure.
Are Cap and Flagsmith free?
Both are open source. Cap 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 Cap and Flagsmith?
Cap is written in JavaScript 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, Cap or Flagsmith?
Choose Cap if you want the larger community (7,798 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.