ALTCHA provides a free, open-source Captcha alternative utilizing a proof-of-work mechanism to safeguard your website against spam and unwanted content. ALTCHA ensures robust spam protection without compromising user privacy.
Integrations supported
- Self-hosted
- Sentinel
- SaaS API (deprecated)
Post-Installation
- Configure ALTCHA globally on the CAPTCHA configuration form via: /admin/config/people/captcha
- Configure ALTCHA on specific forms via: /admin/config/people/captcha/captcha-points
- Users with the
administer altchapermission can configure ALTCHA via: /admin/config/people/captcha/altcha
Requirements
This module depends on the CAPTCHA module.
Additional features
ALTCHA Obfuscate
This feature provides support for the obfuscation mode of the ALTCHA widget, and helps protect sensitive information from bots.
The submodule adds obfuscation field formatters for e-mail, telephone and text fields.
Supporting organizations:
Project information
- Project categories: Integrations, Security
- Ecosystem: CAPTCHA
721 sites report using this module
- Created by filsterjisah on , updated
Stable releases for this project are covered by the security advisory policy.
Look for the shield icon below.
Releases
1.1.0
released 18 February 2026
Works with Drupal: ^10.2 || ^11
Supports ALTCHA obfuscate & -sentinel
Install:




