head to head · open source
Cap vs Flipt
Cap has 7,798 GitHub stars, 579 forks, 10 open issues and last shipped 2 days ago. Flipt has 4,902 stars, 308 forks, 42 open issues and last shipped yesterday. Cap leads on adoption by 59% (7,798 vs 4,902 stars). Cap is written in JavaScript under a custom or non-standard licence; Flipt is written in Go under a custom or non-standard licence. Cap has attracted 7% as many forks as stars, Flipt 6%. Flipt 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
| Cap | Flipt | |
|---|---|---|
| GitHub stars | ★ 7.8K | ★ 4.9K |
| License | Custom / other | Custom / other |
| Written in | JavaScript | Go |
| Last push | 2026-09-16 | 2026-09-17 |
| Forks | ⑂ 579 | ⑂ 308 |
| 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 Flipt if
- You want the Flipt feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Go
- You evaluated both and Flipt 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 Flipt
Flipt is an open source, Git native feature management platform written in Go and distributed under a NOASSERTION license. It lives in the cloud native and DevOps ecosystem, sitting alongside continuous delivery, GitOps, and developer tooling, and it exposes its functionality through gRPC and a gRPC gateway HTTP interface. The project is self hosted and enterprise oriented, with a homepage at flipt.io and documentation at docs.flipt.io. Version 2 is the current line; version 1 remains available on the main branch with its own documentation set.
read the full Flipt overview →
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Frequently asked questions
Is Cap or Flipt more popular?
Cap has 7,798 GitHub stars and Flipt has 4,902. Cap has the larger community by that measure.
Are Cap and Flipt free?
Neither Cap nor Flipt declares a licence in this registry, so check each project's own repository before relying on either for a commercial use. Both are free to self-host.
What is the difference between Cap and Flipt?
Cap is written in JavaScript and Flipt in Go. 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 Flipt?
Choose Cap if you want the larger community (7,798 stars) or its Custom / other licence terms. Choose Flipt if its feature set, stack or Custom / other licence fits better. Both are self-hostable.