Why Organizations Trust ALTCHA

ALTCHA is used by governments and organizations worldwide to protect forms from bots without compromising user privacy. This page lays out the concrete reasons why — not just claims.

Proven at scale

ALTCHA is the #1 privacy-first CAPTCHA widget, with 250,000+ live websites according to builtwith.com.

Built for compliance

ALTCHA and its products are designed to comply with strict data protection and accessibility standards by default:

• Data protection — GDPR, HIPAA, CCPA, PIPEDA/CPPA, LGPD, DPDPA, and PIPL.
• Accessibility — WCAG 2.2 AA and the European Accessibility Act (EAA).
• Enterprise deployments — the Security Compliance Framework for ALTCHA Sentinel is aligned with SOC 2, ISO 27001, GDPR, HIPAA, and other global standards.

See the full Regulatory Compliance overview for details on each.

Security by design

• Role-Based Access Control (RBAC) and Multi-Factor Authentication (MFA)
• Encryption in transit and at rest
• Comprehensive audit logging, with support for exporting logs to external systems
• A Software Bill of Materials (SBOM) for transparency
• Zero-CVE Docker images — every Sentinel release ships a Trivy scan alongside its pentest and vulnerability reports, published in full for transparency
• A published Security Vulnerability Disclosure Policy and Security Advisory history

Data sovereignty and ownership

• No third-party data sharing — ALTCHA doesn't transmit or store visitor data externally, and uses no tracking cookies or fingerprinting.
• Self-hosted option — run Sentinel entirely on your own infrastructure, with perpetual licensing so it remains an asset you control.
• EU-hosted Cloud — ALTCHA Cloud is hosted exclusively in the EU.
• Air-gapped deployment — offline license verification is supported for environments that can't allow outbound call-home traffic.

See Open Source vs. Paid for how these options compare.

Open and auditable

ALTCHA's widget and verification libraries are open source, MIT licensed, and published on GitHub — your team can inspect exactly what's running rather than taking a vendor's word for it. See Open-Source CAPTCHA for details.

Built and operated in the EU

ALTCHA is built and operated in the European Union, with a strong focus on privacy, security, and data sovereignty — from keeping data under your control to meeting demanding European privacy and compliance requirements.

Next steps

• Regulatory Compliance — the full list of supported standards
• Solutions — guidance by organization type, including Governments and Enterprises
• About — the people and values behind ALTCHA
• Contact — questions about compliance, security, or procurement