head to head · open source
GrowthBook vs ALTCHA
GrowthBook has 8,376 GitHub stars, 849 forks, 793 open issues and last shipped yesterday. ALTCHA has 2,757 stars, 132 forks, 0 open issues and last shipped 7 days ago. GrowthBook leads on adoption by 204% (8,376 vs 2,757 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 | ★ 8.4K | ★ 2.8K |
| License | Custom / other | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-17 | 2026-09-11 |
| Forks | ⑂ 849 | ⑂ 132 |
| 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 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
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 ALTCHA
ALTCHA is self hosted privacy first security tool. It lives in TypeScript open source web component ecosystem. It belongs to application security. It protects websites, APIs, and online services from spam, bots, and abuse. It uses proof of work mechanism instead of traditional visual puzzles. It is MIT licensed. Operators run it on own infrastructure.
read the full ALTCHA overview →
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Frequently asked questions
Is GrowthBook or ALTCHA more popular?
GrowthBook has 8,376 GitHub stars and ALTCHA has 2,757. 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 (8,376 stars) or its Custom / other licence terms. Choose ALTCHA if its feature set, stack or MIT licence fits better. Both are self-hostable.