Open Source Alternative to:

Friendly Captcha revolutionizes bot protection with a truly invisible CAPTCHA system that works automatically in the background. Unlike traditional CAPTCHAs that force users to solve puzzles or identify images, this innovative solution uses proof-of-work mechanisms to verify legitimate users without any visible challenges.
Key advantages include:
The system generates unique cryptographic puzzles for each device that solve in the background during form completion. By the time users are ready to submit, verification is already complete. This German-engineered solution offers enterprise-grade security with the highest data protection standards.
Perfect for organizations seeking:
Available with flexible pricing from free non-commercial use to enterprise solutions with unlimited domains and advanced analytics.
Note: The backend of Friendly Captcha is closed source. However, if you'd like to self-host it, use the following lite server.
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