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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.

Spam Filter

ALTCHA’s Spam Filter introduces a distinctive spam-detection feature enabling efficient classification of text and other information, empowering you to distinguish spam from legitimate messages. This anti-spam Captcha feature provides enhanced spam protection for your site.

As a GDPR-compliant alternative to Akismet, this feature seamlessly integrates with the plugin for effortless activation.

Privacy

No cookies, no tracking

ALTCHA prioritizes user privacy by avoiding the use of cookies and fingerprinting techniques.

No external service

Operating in Self-hosted mode (the default setting), this plugin remains fully contained within your WordPress installation, eliminating any reliance on external services. You can opt-in for our SaaS version to utilize the Spam Filter API. For more information visit https://altcha.org.

Modes of Operation

This plugin operates in two modes, you can select which mode you want in the settings (see API Region):

Self-hosted – fully self-contained without external services.
3rd-party external service – ALTCHA’s SaaS requiring an API Key, allows you to choose EU or US region.

Note: The Spam Filter requires ALTCHA’s SaaS. Create an API Key to access it.

REST API

This plugin requires the WordPress REST API. If you are using any “Disable REST API” plugins, ensure that the endpoint /altcha/v1/challenge is allowed.

Supported Integrations

Contact Form 7
Elementor Pro Forms
Forminator
GravityForms
HTML Forms
WPForms
WordPress Login, Register, Password reset
WordPress Comments
Custom HTML (with a short code [altcha])

Source Code

All source code for the plugin, and the ALTCHA widget is available on GitHub. In the repository, you’ll also find versions of non-minified JavaScript and CSS assets:

Plugin: https://github.com/altcha-org/wordpress-plugin
ALTCHA Widget: https://github.com/altcha-org/altcha

Terms of Service And Privacy Policy for SaaS

Privacy Policy: https://altcha.org/privacy-policy
Terms of Service: https://altcha.org/terms-of-service

Awesome plugin with great performance

By frafor on September 23, 2024

I've discovered this plugin a few months ago, switched about 10 sites from recaptcha to altcha in self-hosted mode and it's working beautifully at the moment. I did have some issue with LiteSpeed Cache enabled at first, but 1.9.0 seems to have fixed that!

Funktioniert so wie es soll ;)

By heino18berlin on September 11, 2024

Auf der Suche nach einer rechapta Alternative für Wordpress....sind wir auf altcha gestoßen. Die Integration ist einfach. Funktioniert mit cf7 (inkl userem selbst entwickelten Plugin für cf7).

An great alternative to Re-captcha and Hcaptcha!

By princeofethopia on July 19, 2024

Been using in all the websites, works like a charm! Thank you for releasing in WordPress plugins directory. Now updates are easier.

ALTCHA: Free, Open-Source Captcha Alternative with Robust Spam Protection

By Daniel (danielregeci) on July 15, 2024

ALTCHA is a free, open-source Captcha alternative. It uses a proof-of-work mechanism to protect your website from spam and unwanted content. Unlike other solutions, ALTCHA is self-hosted, avoids cookies and tracking, and is fully GDPR compliant. It also features a powerful spam filter that integrates seamlessly with your WordPress site. With options for self-hosted and external service modes, ALTCHA offers flexibility and robust protection for any WordPress site.

1.9.1

PHP 8 support (replace str_contains by strpos) [#19]

1.9.0

Widget updated to version 1.0.0
CF7 – fix widget placement
Fix page caching

1.8.0

Shortcode (custom integration) – fix mode (SpamFilter)

1.7.0

HTML Forms – add Shortcode option

1.6.1

Fix WordPress login integration

1.6.0

Fix Elementor Pro Forms widget rendering
Fix Contact Form 7 widget position and shortcode support

1.5.0

Fix REST base URL (+ REST prefix removed from settings) [#13]

1.4.0

Support for Elementor Pro Forms
Widget updated to 0.6.7

1.3.1

Fix site_url parsing issue [#11]

1.3.0

Added support for custom REST API prefixes

1.2.0

Forminator – fix widget rendering with file input
Widget updated to 0.6.4

1.1.0

Shortcode – support for language attribute

1.0.0

Widget updated to 0.6.3

0.3.0

Added nonce sanitization
Removed server-side spam filter (required for Plugin Directory)

0.2.1

Fixes requested by Plugin Directory review
Fixed various Spam Filter issues

0.2.0

Widget updated to 0.6.0
Added support for Floating UI

0.1.7

Fix Forminator multi-step forms

0.1.6

Widget updated to 0.5.1

0.1.5

Fixes requested by Plugin Directory review

0.1.4

GravityForms – added label and description options
Altcha widget updated to 0.4.3

0.1.3

Fixed “lost password” verification bug
Altcha widget updated to 0.4.1

0.1.2

Fixed widgets footer link and log warnings

0.1.1

Widget v0.4.0
Challenge expiration

0.1.0

First version

Download, install and activate ALTCHA Spam Protection.

To use the Spam Filter, create an API Key and configure it in the Settings.

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 the your integrations

ALTCHA Spam Protection