head to head · open source
GrowthBook vs Private Captcha
GrowthBook has 8,376 GitHub stars, 849 forks, 793 open issues and last shipped yesterday. Private Captcha has 195 stars, 6 forks, 4 open issues and last shipped yesterday. GrowthBook leads on adoption by 4,195% (8,376 vs 195 stars). GrowthBook is written in TypeScript under a custom or non-standard licence; Private Captcha is written in Go under a custom or non-standard licence. GrowthBook has attracted 10% as many forks as stars, Private Captcha 3%. 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 | Private Captcha | |
|---|---|---|
| GitHub stars | ★ 8.4K | ★ 195 |
| License | Custom / other | Custom / other |
| Written in | TypeScript | Go |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 849 | ⑂ 6 |
| 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 Private Captcha if
- You want the Private Captcha feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Go
- You evaluated both and Private Captcha 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 Private Captcha
Private Captcha is an independent, privacy first, self hostable Proof of Work CAPTCHA service built in the European Union. The project provides bot protection for web applications by asking visitors to solve a computational challenge rather than identifying distorted images or clicking through behavioral tests. The backend is written in Go and serves both the API and the portal, while the client side ships as a JavaScript widget that uses WebAssembly workers where possible. Business data such as accounts and properties is stored in Postgres, and operational data such as difficulty scaling and statistics is stored…
read the full Private Captcha overview →
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Frequently asked questions
Is GrowthBook or Private Captcha more popular?
GrowthBook has 8,376 GitHub stars and Private Captcha has 195. GrowthBook has the larger community by that measure.
Are GrowthBook and Private Captcha free?
Neither GrowthBook nor Private Captcha 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 Private Captcha?
GrowthBook is written in TypeScript and Private Captcha 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, GrowthBook or Private Captcha?
Choose GrowthBook if you want the larger community (8,376 stars) or its Custom / other licence terms. Choose Private Captcha if its feature set, stack or Custom / other licence fits better. Both are self-hostable.