Unclaimed brand
ALTCHA protects your site from bots and spam with a privacy-first CAPTCHA — no tracking, no cookies, fully GDPR compliant and WCAG 2.2 AA accessible.
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Hex Code
Color name
RGB
HSL
CMYK
#1D1DC9
Persian Blue
29, 29, 201
240, 75, 45
86, 86, 0, 21
#C08263
Antique Brass
192, 130, 99
20, 42, 57
0, 32, 48, 25
#171717
Cod Gray
23, 23, 23
0, 0, 9
0, 0, 0, 91
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.
Brand industry
Computers Electronics and Technology
Company type
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Year founded
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Proof-of-work CAPTCHA
Self-hosted bot protection
Adaptive CAPTCHA verification
WordPress anti-spam plugins
Privacy-preserving website security
How do I download the ALTCHA logo?
The ALTCHA logo comes in one version: a logo. Download as transparent PNG.
What does ALTCHA's branding look like?
The ALTCHA wordmark is a compact white uppercase name paired with a circular mark containing a small central dot and curved arc, set in a vivid cobalt-blue lockup. Its visual system uses crisp geometric lettering, cobalt and deep navy against white and pale gray, with restrained green checks as highlights; layouts are spacious and modular, using clean rules, simple iconography, and straightforward product imagery rather than decorative effects.
What are ALTCHA's brand colors?
The ALTCHA color palette uses the hex codes #1D1DC9, #C08263 and #171717.
The ALTCHA name, logos and brand assets are trademarks of ALTCHA and its affiliates. Brandfetch isn't affiliated with or endorsed by ALTCHA. Their use is subject to ALTCHA's brand guidelines.
