More than just
a Captcha protection
ALTCHA represents a modern, accessible, and inclusive approach to safeguarding websites, APIs, and online services from spam and abuse.
Its fundamentally different approach makes it ideal for businesses constrained by privacy regulations in the EU and around the world.
Compliant with Regulations
Comply with GDPR/HIPAA/CCPA/LGPD/DPDPA/PIPL by using a privacy-first solution that does not use cookies nor fingerprinting and does not track users. Learn more.
Complete Spam Protection
Utilize the proof-of-work mechanism as the initial line of defense. Then, stop even sophisticated attacks and human-generated spam with ALTCHA Sentinel.
Friendly to Humans
Say goodbye to tedious puzzle-solving and improve your website's UX by integrating a fully automated proof-or-work mechanism. Try demo.
Inclusive to Robots
Get ready for AIs and integrate M2M ALTCHA into your APIs and online services making them accessible to machines. See how.
Open source, MIT licensed
ALTCHA is a free, open-source project licensed under a permissive MIT license. Works for everyone - individuals, small businesses and enterprises. Visit GitHub.
Try ALTCHA demo
ALTCHA’s web component is familiar to users and easy to integrate into any website.
Check the box to get verified.
ALTCHA Sentinel vs Open Source
ALTCHA Sentinel is an advanced system that adds an extra layer of protection on top of the core open-source functionality. While the open-source version provides basic protection using a proof-of-work mechanism, Sentinel delivers enhanced security and additional features.
| ALTCHA Sentinel | Open Source | |
|---|---|---|
| Data Privacy Compliant with data-privacy regulations. | ||
| Accessibility Fully accessible interface following WCAG guidelines. | ||
| Self-hosted Fully self-hosted on your own infrastructure without external services. | ||
| Ready-to-use All-in-one Docker image with easy deployment options. | ||
| Dashboard & Analytics Real-time analytics with insights into traffic, threats, and detection accuracy. | ||
| Advaced Security Includes replay-attack protection, security groups, and API key management. | ||
| Adaptive Captcha Frictionless experience with extra verification for flagged users. | ||
| Text Classifier Built-in text classifier powered by machine learning. | ||
| Training Data Uses machine learning datasets to improve spam detection. | ||
| Language Detection Identifies and filters content based on detected languages. | ||
| Bot Detection Detect and block bots, crawlers, and AI agents. | ||
| Threat Intelligence Automatically detects and blocks malicious IP addresses. | ||
| IP Geo Fencing Restrict or allow access based on geographic location. | ||
| Email Verification Verify email addresses and prevent fake sign-ups. | ||
| Rate Limiter Protect against brute force attacks with request rate limiting. | ||
| Form Submissions Built-in form capture API with spam filtering. |
Explore the features and documentation of ALTCHA Sentinel for more information.
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ALTCHA is made in Europe.