head to head · open source
Flagsmith vs mCaptcha
Flagsmith has 6,638 GitHub stars, 595 forks, 711 open issues and last shipped yesterday. mCaptcha has 2,498 stars, 95 forks, 54 open issues and last shipped 1.1 years ago. Flagsmith leads on adoption by 166% (6,638 vs 2,498 stars). Flagsmith is written in Python under BSD-3-Clause; mCaptcha is written in Rust under AGPL-3.0. Flagsmith has attracted 9% as many forks as stars, mCaptcha 4%. Flagsmith 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
| Flagsmith | mCaptcha | |
|---|---|---|
| GitHub stars | ★ 6.6K | ★ 2.5K |
| License | BSD-3-Clause | AGPL-3.0 |
| Written in | Python | Rust |
| Last push | 2026-11-02 | 2025-10-07 |
| Forks | ⑂ 595 | ⑂ 95 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Flagsmith if
- You weight community size — 6.6K stars and counting
- You want the BSD-3-Clause license terms
- Your stack matches Python
- 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 Flagsmith
Try our interactive demo Flagsmith is an Open Source Feature Flagging Tool to Ship Faster & Control Releases Change the way your team releases software. Roll out, segment, and optimise—with granular control. Stay secure with on premise and private cloud hosting. Feature flags: Release features behind the safety of a feature flag Make changes remotely: Easily toggle individual features on and off, and make changes without deploying new code A/B testing: Use segments to run A/B and multivariate tests on new features Segments: Release features to beta testers, collect feedback, and iterate Organisation management…
read the full Flagsmith 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 Flagsmith or mCaptcha more popular?
Flagsmith has 6,638 GitHub stars and mCaptcha has 2,498. Flagsmith has the larger community by that measure.
Are Flagsmith and mCaptcha free?
Both are open source. Flagsmith is licensed under BSD-3-Clause and mCaptcha under AGPL-3.0. Neither carries a licence fee.
What is the difference between Flagsmith and mCaptcha?
Flagsmith is written in Python 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, Flagsmith or mCaptcha?
Choose Flagsmith if you want the larger community (6,638 stars) or its BSD-3-Clause licence terms. Choose mCaptcha if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.