About hCaptcha

Privacy, Security, and Machine Learning.

hCaptcha is the world's most widely used independent CAPTCHA service.

What We Do

hCaptcha brings a modern, privacy-focused approach to stopping bots.

We show CAPTCHA challenges that are difficult for bots but easy for people by collecting difficult-to-label data from machine learning problems, and using it to distinguish whether a website or app visitor is human.

Why It Matters

Bad actors are increasingly common online. But sacrificing user privacy is not the answer.

Security solutions offered by ad companies focus primarily on tracking users across the web. We have created an effective security solution that proves harming user privacy is not necessary to deliver excellent results.



CEO. Recognized leader in AI. Has applied machine intelligence at scale to a wide variety of business problems over the past decades.


PhD in Comp. Bio., Stanford. Working with neural networks since 1999. Focus on applied ML and deep learning at scale.


Brendan Eich

CEO of Brave. Co-founder of Mozilla. Creator of the JavaScript programming language. Builder of browsers and more.

Dawn Song

Professor, CS at University of California, Berkeley. Deep learning, security, blockchain expert. CEO of Oasis Labs.

Keiran Thompson

Research Scientist at Stanford. Machine learning and quant finance at major banks, hedge funds, and academia.