> /v1/alternatives/cloudflare-turnstile
Open source alternatives to Cloudflare Turnstile[006]
Cloudflare Turnstile verifies that visitors are human without puzzles, using invisible browser challenges served from Cloudflare's edge. Below are 6 self-hostable open source alternatives, ranked by GitHub popularity.
capjs
The privacy-first, self-hosted CAPTCHA for the modern web.
★ STARS
6.3k
⑂ FORKS
431
mCaptcha
A no-nonsense CAPTCHA system with seamless UX | Backend component
★ STARS
2.4k
⑂ FORKS
88
ALTCHA
GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism.
★ STARS
2.2k
⑂ FORKS
107
Procaptcha
Open-source, frictionless CAPTCHA and bot defense. A privacy-focused alternative to reCAPTCHA and hCaptcha.
★ STARS
295
⑂ FORKS
9
private-captcha
Independent, privacy-first, self-hostable PoW CAPTCHA service made in EU
★ STARS
168
⑂ FORKS
5
friendly-captcha
Lite server for Friendly Captcha
★ STARS
50
⑂ FORKS
11
// EDITOR'S TAKE
ALTCHA is the closest match to the invisible, no-puzzle experience, with a proof-of-work checkbox and mature server-side libraries. friendly-captcha takes the same approach with a smaller community, and capjs is the minimal option when you only need a few kilobytes of script; none of them see traffic across millions of sites, so their bot signals are weaker than Cloudflare's network-wide reputation data.
// FREQUENTLY ASKED
What is the best open source Cloudflare Turnstile alternative?
capjs is the most popular open source Cloudflare Turnstile alternative by GitHub stars (6,288 stars). The other 5 options are ranked above.
Are these Cloudflare Turnstile alternatives self-hostable?
Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.
Are they free?
All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.