head to head · open source
Flagsmith vs Private Captcha
Flagsmith has 6,638 GitHub stars, 595 forks, 711 open issues and last shipped yesterday. Private Captcha has 199 stars, 8 forks, 4 open issues and last shipped 3 days ago. Flagsmith leads on adoption by 3,236% (6,638 vs 199 stars). Flagsmith is written in Python under BSD-3-Clause; Private Captcha is written in Go under a custom or non-standard licence. Flagsmith has attracted 9% as many forks as stars, Private Captcha 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 | Private Captcha | |
|---|---|---|
| GitHub stars | ★ 6.6K | ★ 199 |
| License | BSD-3-Clause | Custom / other |
| Written in | Python | Go |
| Last push | 2026-11-02 | 2026-10-31 |
| Forks | ⑂ 595 | ⑂ 8 |
| 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 Private Captcha if
- You want the Private Captcha feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Go
- You evaluated both and Private Captcha 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 Private Captcha
Private Captcha is an independent, privacy first, self hostable Proof of Work CAPTCHA service made in EU. About Project goals provide powerful means to fight bots, including AI scrapers, and spam even as AI improves make web a slightly better place by replacing existing frustrating CAPTCHAs stay focused on privacy and GDPR compliance as well as on prem deployment provide stable, backward compatible and reliable API and integrations be sustainable financially to fulfill previous goals long enough Features adaptive challenge difficulty (including various configuration options) optimized backend (low resource…
read the full Private Captcha overview →
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Frequently asked questions
Is Flagsmith or Private Captcha more popular?
Flagsmith has 6,638 GitHub stars and Private Captcha has 199. Flagsmith has the larger community by that measure.
Are Flagsmith and Private Captcha free?
Both are open source. Flagsmith is licensed under BSD-3-Clause, and Private Captcha has no licence declared in this registry. Both are free to self-host.
What is the difference between Flagsmith and Private Captcha?
Flagsmith is written in Python and Private Captcha in Go. 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 Private Captcha?
Choose Flagsmith if you want the larger community (6,638 stars) or its BSD-3-Clause licence terms. Choose Private Captcha if its feature set, stack or Custom / other licence fits better. Both are self-hostable.