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ALTCHA

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ALTCHA is a free, open-source alternative to CAPTCHA that uses a proof-of-work system to protect websites from spam and unwanted content while respecting user privacy. It can be configured globally or on specific forms.

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 altcha permission 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.

Versioning

There are currently 2 supported branches:

  • 1.x: ALTCHA v2 widget. View specific configuration docs here.
  • 2.x: ALTCHA v3 widget with improved algorithm and additional display options. View specific configuration docs here.

Alternative modules

Friendly Captcha - Alternative proof-of-work CAPTCHA solution.
CAPTCHA - See the list of other CAPTCHA modules.

Depends on

Dependencies of the latest stable release

Required by

Tracked projects that depend on this one

No tracked projects depend on this one yet.

Activity

Tracked releases
8
Tracked since
Oct 2024
Latest release
1 month ago
Releases (12 mo)
5 ▲ from 3
Maintenance
Active

Release Timeline

Releases

Version Type Core Release date
2.0.0-beta1 Pre-release 10–11 Jul 17, 2026
1.2.0 Stable 10–11 Jul 17, 2026
2.0.x-dev Dev 10–11 Jul 16, 2026
1.1.0 Stable 10–11 Feb 18, 2026
1.1.0-rc1 Pre-release 10–11 Nov 7, 2025
1.0.0 Stable 10–11 Dec 6, 2024
1.0.0-beta1 Pre-release 10–11 Nov 28, 2024
1.0.x-dev Dev 10–11 Oct 23, 2024