head to head · open source
GrowthBook vs mCaptcha
GrowthBook has 8,558 GitHub stars, 890 forks, 793 open issues and last shipped yesterday. mCaptcha has 2,498 stars, 95 forks, 54 open issues and last shipped 1.1 years ago. GrowthBook leads on adoption by 243% (8,558 vs 2,498 stars). GrowthBook is written in TypeScript under a custom or non-standard licence; mCaptcha is written in Rust under AGPL-3.0. GrowthBook has attracted 10% as many forks as stars, mCaptcha 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 | mCaptcha | |
|---|---|---|
| GitHub stars | ★ 8.6K | ★ 2.5K |
| License | Custom / other | AGPL-3.0 |
| Written in | TypeScript | Rust |
| Last push | 2026-11-02 | 2025-10-07 |
| Forks | ⑂ 890 | ⑂ 95 |
| 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 mCaptcha if
- You want the mCaptcha feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Rust
- You evaluated both and mCaptcha 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 mCaptcha
mCaptcha Proof of work based, privacy respecting CAPTCHA system with a kickass UX. STATUS: ACTIVE DEVELOPMENT Skip to demo mCaptcha is a privacy respecting, free CAPTCHA system with a kickass UX. Your users no longer have to interact with ridiculous image based CAPTCHA system, wasting precious mental bandwidth. Instead, your computer will do the work for you, see for yourself! How does it work? mCaptcha uses SHA256 based proof of work (PoW) to rate limit users. When a user wants to do something on a mCaptcha protected website, 1. they will have to generate proof of work (a bunch of math that will takes time to…
read the full mCaptcha overview →
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Frequently asked questions
Is GrowthBook or mCaptcha more popular?
GrowthBook has 8,558 GitHub stars and mCaptcha has 2,498. GrowthBook has the larger community by that measure.
Are GrowthBook and mCaptcha free?
Both are open source. GrowthBook has no licence declared in this registry, and mCaptcha is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between GrowthBook and mCaptcha?
GrowthBook is written in TypeScript and mCaptcha in Rust. 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 mCaptcha?
Choose GrowthBook if you want the larger community (8,558 stars) or its Custom / other licence terms. Choose mCaptcha if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.