Title: Greyfu Login Captcha
Author: greyfu
Published: <strong>December 3, 2025</strong>
Last modified: December 3, 2025

---

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# Greyfu Login Captcha

 By [greyfu](https://profiles.wordpress.org/greyfu/)

[Download](https://downloads.wordpress.org/plugin/greyfu-login-captcha.zip)

 * [Details](https://test.wordpress.org/plugins/greyfu-login-captcha/#description)
 * [Reviews](https://test.wordpress.org/plugins/greyfu-login-captcha/#reviews)
 *  [Installation](https://test.wordpress.org/plugins/greyfu-login-captcha/#installation)
 * [Development](https://test.wordpress.org/plugins/greyfu-login-captcha/#developers)

 [Support](https://wordpress.org/support/plugin/greyfu-login-captcha/)

## Description

Greyfu Login Captcha adds a secure verification step to your WordPress login form,
helping block automated login attempts and brute-force attacks.

**Lite Version (Free):**
 * Simple math-based captcha * Multisite compatible * Lightweight
and fast * No personal data stored or transmitted * Works without any external service

**Pro-Ready Features (Optional Upgrade):**
 * Infrastructure prepared for reCAPTCHA
v2 integration * Infrastructure prepared for hCaptcha integration * API key fields
included

The free version is fully functional on its own and does not require any external
captcha service.

### Third Party Services

This plugin optionally connects to external captcha services when the Pro features
are enabled:

**Google reCAPTCHA (Optional)**
 When reCAPTCHA is enabled in Pro settings, the 
plugin sends verification requests to Google’s reCAPTCHA service. – Service: https://
www.google.com/recaptcha/ – Privacy Policy: https://policies.google.com/privacy –
Terms of Service: https://policies.google.com/terms – Data sent: User’s IP address
and reCAPTCHA response token – When: Only during login form submission when reCAPTCHA
is enabled

**hCaptcha (Optional)**
 When hCaptcha is enabled in Pro settings, the plugin sends
verification requests to hCaptcha service. – Service: https://www.hcaptcha.com/ –
Privacy Policy: https://www.hcaptcha.com/privacy – Terms of Service: https://www.
hcaptcha.com/terms – Data sent: User’s IP address and hCaptcha response token – 
When: Only during login form submission when hCaptcha is enabled

The free/lite version uses a built-in math captcha that does not connect to any 
external service.

### Support / Contact

For issues or questions, please contact us:
 **Email:** hello@greyfu.com **Website:**
https://greyfu.com

## Screenshots

 * [[
 * Math captcha displayed on the WordPress login page.
 * [[
 * Example reCAPTCHA login interface (Pro extension).
 * [[
 * Settings page showing configuration options.

## Installation

 1. Upload the plugin folder to `/wp-content/plugins/`.
 2. Activate the plugin through the **Plugins** menu.
 3. Configure settings under **Settings  Greyfu Login Captcha**.

## FAQ

### Does the free version work without external APIs?

Yes. The built-in math captcha requires no API keys and works out of the box.

### Does the plugin store personal data?

No. No personal or sensitive information is tracked, logged, or sent to remote servers.

### Is multisite supported?

Yes, this plugin works on WordPress Multisite installations.

## Reviews

There are no reviews for this plugin.

## Contributors & Developers

“Greyfu Login Captcha” is open source software. The following people have contributed
to this plugin.

Contributors

 *   [ greyfu ](https://profiles.wordpress.org/greyfu/)

[Translate “Greyfu Login Captcha” into your language.](https://translate.wordpress.org/projects/wp-plugins/greyfu-login-captcha)

### Interested in development?

[Browse the code](https://plugins.trac.wordpress.org/browser/greyfu-login-captcha/),
check out the [SVN repository](https://plugins.svn.wordpress.org/greyfu-login-captcha/),
or subscribe to the [development log](https://plugins.trac.wordpress.org/log/greyfu-login-captcha/)
by [RSS](https://plugins.trac.wordpress.org/log/greyfu-login-captcha/?limit=100&mode=stop_on_copy&format=rss).

## Changelog

#### 1.0.0

 * Initial release with math captcha support and Pro-ready structure.

## Meta

 *  Version **1.0.0**
 *  Last updated **5 months ago**
 *  Active installations **Fewer than 10**
 *  WordPress version ** 5.5 or higher **
 *  Tested up to **6.9.4**
 *  PHP version ** 7.4 or higher **
 *  Language
 * [English (US)](https://wordpress.org/plugins/greyfu-login-captcha/)
 * Tags
 * [authentication](https://test.wordpress.org/plugins/tags/authentication/)[brute force protection](https://test.wordpress.org/plugins/tags/brute-force-protection/)
   [captcha](https://test.wordpress.org/plugins/tags/captcha/)[login](https://test.wordpress.org/plugins/tags/login/)
   [security](https://test.wordpress.org/plugins/tags/security/)
 *  [Advanced View](https://test.wordpress.org/plugins/greyfu-login-captcha/advanced/)

## Ratings

No reviews have been submitted yet.

[Your review](https://wordpress.org/support/plugin/greyfu-login-captcha/reviews/#new-post)

[See all reviews](https://wordpress.org/support/plugin/greyfu-login-captcha/reviews/)

## Contributors

 *   [ greyfu ](https://profiles.wordpress.org/greyfu/)

## Support

Got something to say? Need help?

 [View support forum](https://wordpress.org/support/plugin/greyfu-login-captcha/)