About ALTCHA
- ALTCHA is a privacy-first CAPTCHA and bot protection platform designed to replace traditional CAPTCHAs with a self-hosted solution.
- It runs on your own infrastructure with no external calls, cookies, or data sharing, built to meet GDPR, HIPAA, CCPA and WCAG accessibility standards.
- The offering includes ALTCHA Sentinel for on-premise protection and an open-source core, with support for 50+ languages and WCAG/EAA accessibility.
- It provides easy integration across websites and apps and can be deployed via Docker, Kubernetes, or via integration libraries.
Key features
- Self-hosted on-premise architecture (no external calls)
- Frictionless Proof-of-Work Captcha with no user puzzles
- ALTCHA Sentinel for advanced, on-premise bot protection
- Threat Intelligence and IP/Phishing detection
- Classifier for text inputs and automated moderation
- Rate limiters and input data analysis to prevent abuse
- Language detection and 50+ language support
- Email Spam Filter and content filtering
- Code Captcha with audio component for accessibility
- Invisible, Floating UI, and Overlay UI captcha integration options
- Lightweight bundle with fast load times
- Open Source Core (MIT) with commercial Sentinel options
- Frameworks and server libraries across popular languages
Why choose ALTCHA?
- Privacy-first: no cookies, no tracking, no data sharing, GDPR/compliance-focused
- Self-hosted on your own infrastructure for data residency and control
- Strong compliance coverage (GDPR, HIPAA, CCPA, LGPD, DPDPA, PIPL) and WCAG/EAA accessibility
- Open-source core for transparency and security auditing
- Lightweight, fast-loading widget with broad compatibility
- Enterprise-grade Sentinel for advanced protection and threat intelligence
- Flexible integration across forms, APIs, and multi-language environments
- Clear licensing for on-premise deployment with scalable plans
Pricing
- Free Trial: 30-day free trial starting automatically after installation; includes all Professional features, unlimited verifications, multi-domain support. Trial limitations: single account/user; production use not allowed; one trial license per IP address within 60 days.
- Starter: €24 / month
- Instances: 1
- Accounts: 1
- Users: 10
- Domains: Unlimited
- Verifications: Unlimited
- Throughput: Max 1 RPS
- External Redis: No
- PostgreSQL: No
- High Availability: No
- Email Spam Filter: No
- Role-Based Access Control: No
- Single Sign-On (SSO): No
- Audit Logs: No
- ClickHouse: No
- OpenTelemetry: No
- Software Updates: Yes
- Professional: €74 / month
- Instances: 3
- Accounts: 10
- Users: 10
- Domains: Unlimited
- Verifications: Unlimited
- Throughput: Unlimited
- External Redis: Yes
- PostgreSQL: Yes
- High Availability: Yes
- Email Spam Filter: Yes
- Role-Based Access Control: Yes
- Single Sign-On (SSO): No
- Audit Logs: No
- ClickHouse: No
- OpenTelemetry: No
- Software Updates: Yes
- Enterprise: €600 / month
- Instances: Unlimited
- Accounts: Unlimited
- Users: Unlimited
- Domains: Unlimited
- Verifications: Unlimited
- Throughput: Unlimited
- External Redis: Yes
- PostgreSQL: Yes
- High Availability: Yes
- Email Spam Filter: Yes
- Role-Based Access Control: Yes
- Single Sign-On (SSO): Yes
- Audit Logs: Yes
- ClickHouse: Yes
- OpenTelemetry: Yes
- Software Updates: Yes
- Discounts: 10% biannual, 20% annual subscriptions.
- All Sentinel licenses are self-hosted (on-premise); managed deployments are separate.