Captcha.eu offers an invisible anti-bot service aimed at European users. It runs CAPTCHA checks in the background (no cookies or external tracking) to detect bots while remaining transparent to human visitors. The service is fully GDPR-compliant and is hosted in Austria, and it is certified as barrier-free for accessibility. Captcha.eu supports both silent verification and an optional one-click widget for user challenges. It is marketed as a privacy-friendly, user-friendly alternative to Google reCAPTCHA. The site does not mention a founding year or funding.