This is ALTCHA Plugin version 1.
ALTCHA Plugin version 2 is now available, offering improved protection and enhanced reliability. An upgrade is recommended for all users.
Learn more |
Installation guide |
Migration guide
What's new in version 2:
- Effective: blocks 99% of spam and abuse attempts
- Invisible for users: frictionless protection, no puzzles or CAPTCHAs
- Works everywhere: plugin-agnostic Request Interceptor integrates with any form plugin
- Handles heavy traffic: stay online with Under Attack Mode
- Stops abuse at scale: firewall and rate limiting included
- Privacy-first: 100% GDPR-compliant and fully accessible
- Unlimited: no external services, unlimited verifications
Learn more about ALTCHA at
altcha.org.
ALTCHA provides a free, open-source Captcha alternative utilizing a proof-of-work mechanism to safeguard your website against spam and unwanted content. Our anti-spam solution ensures robust spam protection without compromising user privacy.
Unlike other solutions, ALTCHA is free, open-source, and self-hosted. It operates independently without external services, avoids the use of cookies and fingerprinting, refrains from user tracking, and maintains full compliance with GDPR regulations.
Download, install and activate
ALTCHA Spam Protection.
Alternatively, install the plugin manually:
- Download the
.zip from the Releases.
- Upload
altcha folder to the /wp-content/plugins/ directory
- Activate the plugin through the 'Plugins' menu in WordPress
- Review the settings and enable your integrations