head to head · open source
Flagsmith vs ALTCHA
Flagsmith has 6,638 GitHub stars, 595 forks, 711 open issues and last shipped yesterday. ALTCHA has 2,870 stars, 143 forks, 0 open issues and last shipped 12 days ago. Flagsmith leads on adoption by 131% (6,638 vs 2,870 stars). Flagsmith is written in Python under BSD-3-Clause; ALTCHA is written in TypeScript under MIT. Flagsmith has attracted 9% as many forks as stars, ALTCHA 5%. 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 | ALTCHA | |
|---|---|---|
| GitHub stars | ★ 6.6K | ★ 2.9K |
| License | BSD-3-Clause | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-10-22 |
| Forks | ⑂ 595 | ⑂ 143 |
| 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 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 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 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 Flagsmith or ALTCHA more popular?
Flagsmith has 6,638 GitHub stars and ALTCHA has 2,870. Flagsmith has the larger community by that measure.
Are Flagsmith and ALTCHA free?
Both are open source. Flagsmith is licensed under BSD-3-Clause and ALTCHA under MIT. Neither carries a licence fee.
What is the difference between Flagsmith and ALTCHA?
Flagsmith is written in Python 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, Flagsmith or ALTCHA?
Choose Flagsmith if you want the larger community (6,638 stars) or its BSD-3-Clause licence terms. Choose ALTCHA if its feature set, stack or MIT licence fits better. Both are self-hostable.