ddos-protection

mCaptcha

mCaptchaOpen

Privacy-focused proof-of-work CAPTCHA with no tracking or puzzles

mCaptcha is a free, self-hosted CAPTCHA that protects websites and forms with proof-of-work challenges instead of image puzzles or visitor tracking.

Private Captcha

Private Captcha

Privacy-first proof-of-work CAPTCHA with invisible checks

Private Captcha is a privacy-first proof-of-work CAPTCHA that blocks bots with invisible cryptographic checks instead of puzzles, tracking, or cookies.