altcha-org/altcha
A revolutionary proof-of-work CAPTCHA alternative that protects websites and APIs from spam without cookies or tracking. Self-hosted solution delivers frictionless verification while maintaining full GDPR compliance and user privacy.

Revolutionizing Web Security: ALTCHA's Advanced Protection System
In today's digital landscape, protecting web applications from spam and abuse is crucial. ALTCHA emerges as a groundbreaking solution, leveraging proof-of-work mechanisms to deliver robust security without compromising user privacy or experience.
Innovative Security Approach
Unlike traditional CAPTCHA systems that rely on visual puzzles or intrusive tracking, ALTCHA implements a sophisticated proof-of-work mechanism. This innovative approach ensures effective spam prevention while maintaining a seamless user experience. The system operates independently of cookies and fingerprinting techniques, making it a perfect choice for privacy-conscious implementations.
Privacy-First Architecture
ALTCHA's architecture is built with privacy at its core. The self-hosted nature of the solution gives organizations complete control over their security infrastructure. By eliminating the need for third-party services, ALTCHA ensures full GDPR compliance while maintaining robust protection against automated attacks and spam.
Comprehensive Feature Set
The platform offers an extensive range of capabilities designed to enhance security and user experience:
- Advanced data obfuscation to protect sensitive information from scraping attempts
- Cookie-less operation ensuring GDPR compliance by default
- Self-hosted infrastructure for complete control and privacy
- Flexible SaaS API option for quick implementation
Technical Excellence
ALTCHA's technical implementation showcases its commitment to efficiency and performance. The system's default bundle is remarkably lightweight, combining all necessary components into a single file that's only 17 kB when GZIPped - making it 94% smaller than traditional solutions like reCAPTCHA.
Versatile Integration Options
The platform supports a wide range of integration options across popular frameworks and technologies:
- Seamless integration with React, Vue, Svelte, Solid, Lit, and Angular
- Comprehensive server-side support for TypeScript, PHP, Go, Python, Java, Ruby, and Elixir
- CMS compatibility including WordPress and other major platforms
Advanced Anti-Spam Capabilities
ALTCHA includes sophisticated spam filtering functionality that analyzes various data signals to identify and prevent spam submissions. The system can evaluate multiple factors including:
- Geographic location verification
- Language pattern analysis
- Input field validation
- Time zone correlation
Performance and Reliability
The system's architecture ensures optimal performance through:
- Efficient worker distribution for proof-of-work calculations
- Automatic challenge renewal capabilities
- Flexible configuration options for customized security levels
- Robust error handling and verification mechanisms
Developer-Friendly Implementation
ALTCHA provides comprehensive tools for developers, including:
- Extensive configuration options for customized implementation
- Event-driven architecture for seamless integration
- Custom fetch function support for specialized requirements
- Detailed documentation and integration guides
Enhanced Security Features
The platform includes additional security measures such as:
- Customizable challenge parameters
- Flexible verification mechanisms
- Automated expiration handling
- Configurable security thresholds
ALTCHA represents a significant advancement in web security technology, offering a perfect balance between robust protection and user privacy. Its innovative approach, combined with extensive integration options and developer-friendly features, makes it an ideal choice for organizations seeking to enhance their security infrastructure while maintaining compliance with privacy regulations.