Best CAPTCHA Software for Node.js

ALTCHA is a CAPTCHA alternative which uses a proof of work mechanism to protect websites and online services against spam. ALTCHA uses a mechanism of proof-of-work to protect your website, online services, and APIs from spam and unwanted material. Unlike other solutions ALTCHA is open-source, self-hosted and free. It does not require external services and does not use fingerprinting or cookies.

Prevention is always more cost-effective when it comes to fraud. CyberSiARA's intuitive traffic testing provides a proactive cyber-security approach that stops fraud at its tracks. The traffic classification capability distinguishes between real users and potential attackers using interactive enforcement challenges in real-time. This stops both automated and user-driven attacks. CyberSiARA uses powerful processes for traffic analysis to determine user intention. The system uses interactive challenges to test suspicious activity by identifying fraud indicators in traffic behavior. This allows legitimate users to have a seamless experience while attacks of all kinds are defeated. Innovative challenge strategies are used to stop traffic designed to overcome authentication challenges.