The best open source Bot Protection alternative to reCAPTCHA is Anubis. It's not free, so if you're looking for a free alternative, you could try Anubis or Procaptcha. If that doesn't work for you, our users have ranked more than 25 alternatives to reCAPTCHA, but unfortunately only two of them are open source Bot Protection Services. If you can't find an alternative you can try to remove all filters.
Applies sha256 proof-of-work challenges to incoming HTTP requests, targeting AI crawlers, bots that ignore robots.txt, and automated scrapers, protecting server resources and preventing unwanted search engine indexing for privacy-focused sites.
Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy and security. It's a pioneering solution designed to offer an alternative to conventional CAPTCHA systems that often compromise user privacy.
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