# ALTCHA - **Website:** - **Primary alias:** `altcha.org` ## Description ALTCHA is a privacy-focused CAPTCHA and bot-protection brand operated by BAU Software s.r.o. in Czechia. Its products help websites block automated sign-ups and form spam while minimizing friction for legitimate visitors. Instead of asking users to solve visual puzzles, ALTCHA runs an invisible proof-of-work challenge and can escalate to an accessible check when traffic appears automated. The service is designed without cookies, tracking, fingerprinting, personal-data collection, or third-party data sharing, and supports GDPR compliance and WCAG 2.2 AA accessibility. Organizations can choose the free, MIT-licensed open-source widget, managed ALTCHA Cloud, or self-hosted ALTCHA Sentinel, including air-gapped deployment options. ALTCHA also offers a self-contained WordPress plugin that requires no code and sends no information to external services. Cloud and Sentinel plans add features such as adaptive verification and threat intelligence. The platform supports more than 50 languages, right-to-left layouts, and integrations across popular frameworks and programming languages. Documentation, integration guides, a playground, and developer tools help teams implement the service. ## Industries - 🖥 Computers Electronics and Technology - 🖥 Computer Security _(under Computers Electronics and Technology)_ ## Links - [github](https://github.com/altcha-org) ## Logos & icons - logo _(primary)_ — PNG — [download](https://cdn.brandfetch.io/idgWf2geNC/w/128/h/128/theme/dark/logo.png?c=1bxid64Mup7aczewSAYMX&t=1793845883367) ## Colors | Name | Hex | Theme | | --- | --- | --- | | Persian Blue | #1d1dc9 | accent | | Cod Gray | #171717 | dark | | Antique Brass | #c08263 | light | ## Fonts - SFMono-Regular — asset _(system)_ - SFMono-Regular — asset _(system)_ - SFMono-Regular — asset _(system)_ --- _Source: _ _See [/llms.txt](/llms.txt) for a full list of agent-readable pages, and [/auth.md](/auth.md) for how agents authenticate._