
reCAPTCHA
hCaptcha
Cloudflare Turnstile
Cap Captcha
ALTCHA
mosparo
GeeTest CAPTCHA
Independent, privacy-first, self-hostable CAPTCHA service made in EU

Developer documentation that anyone can edit

Website, pricing, platforms and company facts side by side.
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| Website | privatecaptcha.com | opendevdocs.com |
| Pricing | — | |
| Company | Startup from Estonia · 2025 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Private Captcha offers a user-friendly CAPTCHA solution that protects forms and APIs while maintaining high privacy standards without requiring extra integration efforts. Instead of asking users to solve complex puzzles or track their behavior, Private Captcha solves an invisible cryptographic...
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When comparing Private Captcha and Open Devdocs, you can also consider the following products.

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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
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Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.
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ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.
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