head to head · open source
GrowthBook vs Cap
GrowthBook has 8,376 GitHub stars, 849 forks, 793 open issues and last shipped yesterday. Cap has 7,798 stars, 579 forks, 10 open issues and last shipped 2 days ago. GrowthBook leads on adoption by 7% (8,376 vs 7,798 stars). GrowthBook is written in TypeScript under a custom or non-standard licence; Cap is written in JavaScript under a custom or non-standard licence. GrowthBook has attracted 10% as many forks as stars, Cap 7%. 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 | Cap | |
|---|---|---|
| GitHub stars | ★ 8.4K | ★ 7.8K |
| License | Custom / other | Custom / other |
| Written in | TypeScript | JavaScript |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 849 | ⑂ 579 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick GrowthBook if
- You weight community size — 8.4K 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 Cap if
- You want the Cap feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches JavaScript
- You evaluated both and Cap fits your workflow better
About GrowthBook
GrowthBook is an open source platform for feature flags, A/B experimentation, and product analytics that product, data, and platform teams can either consume through a hosted cloud account or run entirely on their own infrastructure.
read the full GrowthBook overview →
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.
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Frequently asked questions
Is GrowthBook or Cap more popular?
GrowthBook has 8,376 GitHub stars and Cap has 7,798. GrowthBook has the larger community by that measure.
Are GrowthBook and Cap free?
Neither GrowthBook nor Cap 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 GrowthBook and Cap?
GrowthBook is written in TypeScript and Cap in JavaScript. 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 Cap?
Choose GrowthBook if you want the larger community (8,376 stars) or its Custom / other licence terms. Choose Cap if its feature set, stack or Custom / other licence fits better. Both are self-hostable.