head to head · open source
GrowthBook vs ALTCHA
GrowthBook has 8,558 GitHub stars, 890 forks, 793 open issues and last shipped yesterday. ALTCHA has 2,870 stars, 143 forks, 0 open issues and last shipped 12 days ago. GrowthBook leads on adoption by 198% (8,558 vs 2,870 stars). GrowthBook is written in TypeScript under a custom or non-standard licence; ALTCHA is written in TypeScript under MIT. GrowthBook has attracted 10% as many forks as stars, ALTCHA 5%. 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 | ALTCHA | |
|---|---|---|
| GitHub stars | ★ 8.6K | ★ 2.9K |
| License | Custom / other | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-10-22 |
| Forks | ⑂ 890 | ⑂ 143 |
| 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 ALTCHA if
- You want the ALTCHA feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and ALTCHA 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 ALTCHA
ALTCHA ALTCHA is a self hosted, privacy first security solution that protects your websites, APIs, and online services from spam and abuse through an innovative proof of work mechanism. Unlike traditional CAPTCHAs that depend on intrusive methods like cookies or fingerprinting, ALTCHA delivers robust protection while respecting user privacy. ALTCHA is fully compliant with: Global privacy regulations : GDPR, HIPAA, CCPA, PIPEDA/CPPA, LGPD, DPDPA, and PIPL Accessibility standards : WCAG 2.2 AA level and the European Accessibility Act For more details, visit altcha.org. Playground Want to see it in action? Visit…
read the full ALTCHA overview →
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Frequently asked questions
Is GrowthBook or ALTCHA more popular?
GrowthBook has 8,558 GitHub stars and ALTCHA has 2,870. GrowthBook has the larger community by that measure.
Are GrowthBook and ALTCHA free?
Both are open source. GrowthBook has no licence declared in this registry, and ALTCHA is licensed under MIT. Both are free to self-host.
What is the difference between GrowthBook and ALTCHA?
GrowthBook is written in TypeScript and ALTCHA in TypeScript. 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 ALTCHA?
Choose GrowthBook if you want the larger community (8,558 stars) or its Custom / other licence terms. Choose ALTCHA if its feature set, stack or MIT licence fits better. Both are self-hostable.