Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.



Arkose Labs is described as 'The Arkose Labs platform undermines the economic drivers behind fraud until perpetrators are compelled to abandon attacks. Real-time risk classification of traffic with interactive enforcement challenges, the solution defeats automated attacks' and is an app. There are more than 10 alternatives to Arkose Labs for a variety of platforms, including Web-based, Self-Hosted, SaaS, PHP and Docker apps. The best Arkose Labs alternative is Cap Captcha, which is both free and Open Source. Other great apps like Arkose Labs are reCAPTCHA, Procaptcha, hCaptcha and mCaptcha.
Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.



reCAPTCHA is a free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and bots apart.


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.




hCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way.




UniqPin is a free for non-commercial use service which destiny improve ability of interfaces detect a human or a computer operate with it.

Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your Drupal, Wordpress and Joomla site or blog.
MTCaptcha is a smart captcha service that prioritizes privacy and accessibility. It offers an adaptive invisible noCaptcha that is easy for humans but hard for bots, making verification frictionless. MTCaptcha is GDPR and WCAG compliant, ensuring that your data is never sold or...






GeeTest protects your websites, mobile apps and APIs from bad bot attacks with zero user friction. Its self-learning defense model based on Graph Convolutional Networks and massive volumes of biometric data collected in the past 7 years allows GeeTest to identify and mitigate...



