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 under the Apache 2.0 license and can replace reCAPTCHA in minutes. The European-built solution prioritizes user experience without compromising security.