About ALTCHA
ALTCHA is a CAPTCHA alternative that blocks bots and spam without cookies or tracking. Its core project is open source and released under the MIT license.
What it does
The widget runs a proof-of-work challenge in the background, so most visitors never see a prompt. Sites can run it on their own servers for full control of their data, or use the vendor's cloud and Sentinel options. The vendor says it is GDPR compliant and built for keyboard and screen reader users.
Key features
- No cookies, tracking or visual puzzles
- Can be self-hosted for full data control
- WordPress plugin that needs no code
- WCAG 2.2 AA accessible with keyboard support
- Interface available in more than 50 languages
Who it's for
ALTCHA suits website owners, developers and WordPress users who want to stop spam without collecting personal data. Teams that need advanced risk scoring may prefer the cloud tier.
Pricing and good to know
The open source core is MIT licensed and free to use. The vendor also offers Cloud and Sentinel products that add risk-based checks on top of the core. Self-hosting means you run the service yourself, so plan for updates and monitoring.
Highlights
- No cookies, tracking or visual puzzles
- Can be self-hosted for full data control
- WordPress plugin that needs no code
- WCAG 2.2 AA accessible with keyboard support
- Interface available in more than 50 languages
