Tellstack

Websites using Altcha

Altcha is a spam and abuse protection solution for websites and apps, offering a privacy-friendly Captcha and other tools designed with GDPR compliance to provide strong security while safeguarding user privacy. Category: Security. https://altcha.org

1 site in our index use Altcha.

The most visited of them

SiteVersionFirst seen
opensource.org2026-10-28 12:34

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