Cap

Cap offers a revolutionary approach to web security with its privacy-first CAPTCHA alternative that eliminates the need for visual puzzles. Using SHA-256 proof-of-work technology, it provides robust protection while respecting user privacy.

Key advantages:

• Ultra-lightweight: At just ~20kb with zero dependencies, it's 250x smaller than hCaptcha and loads in milliseconds
• Complete privacy: No telemetry sent to external servers, keeping user data secure
• Fully customizable: Modify colors, size, position, and icons using CSS variables to match your brand
• Modern approach: Users solve computational challenges instead of time-consuming visual puzzles

Flexible deployment options:

• Self-hosted: Full control over your CAPTCHA implementation
• Standalone mode: Deploy anywhere using Docker containers with built-in analytics
• Programmatic integration: Hide widgets and solve challenges in the background
• API protection: M2M capabilities keep APIs secure while remaining accessible to authorized bots

Built with developers in mind, Cap is completely open-source under the Apache 2.0 license and can replace reCAPTCHA in minutes. The European-built solution prioritizes user experience without compromising security.