head to head · open source
GrowthBook vs Private Captcha
GrowthBook has 8,558 GitHub stars, 890 forks, 793 open issues and last shipped yesterday. Private Captcha has 199 stars, 8 forks, 4 open issues and last shipped 3 days ago. GrowthBook leads on adoption by 4,201% (8,558 vs 199 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 4%. 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 | ★ 8.6K | ★ 199 |
| License | Custom / other | Custom / other |
| Written in | TypeScript | Go |
| Last push | 2026-11-02 | 2026-10-31 |
| Forks | ⑂ 890 | ⑂ 8 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick GrowthBook if
- You weight community size — 8.6K 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
Open Source Feature Flags, Experimentation, and Product Analytics Create a free GrowthBook Cloud account to get started quickly. Or run it yourself with: Then visit View the full Self Hosting Instructions for more details. This pulls our prebuilt public Docker image and needs no registry credentials. If you instead build the image from the Dockerfile in this repo, its hardened base images come from Docker's dhi.io registry, which requires a one time docker login dhi.io with any free Docker account — see Building from source. Our Philosophy The top 1% of companies spend thousands of hours building their own in…
read the full GrowthBook overview →
About Private Captcha
Private Captcha is an independent, privacy first, self hostable Proof of Work CAPTCHA service made in EU. About Project goals provide powerful means to fight bots, including AI scrapers, and spam even as AI improves make web a slightly better place by replacing existing frustrating CAPTCHAs stay focused on privacy and GDPR compliance as well as on prem deployment provide stable, backward compatible and reliable API and integrations be sustainable financially to fulfill previous goals long enough Features adaptive challenge difficulty (including various configuration options) optimized backend (low resource…
read the full Private Captcha overview →
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Frequently asked questions
Is GrowthBook or Private Captcha more popular?
GrowthBook has 8,558 GitHub stars and Private Captcha has 199. 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 (8,558 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.