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: [email protected]
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
- Upload the plugin folder to
/wp-content/plugins/. - Activate the plugin through the Plugins menu.
- Configure settings under Settings Greyfu Login Captcha.
FAQ
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Does the free version work without external APIs?
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Yes. The built-in math captcha requires no API keys and works out of the box.
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Does the plugin store personal data?
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No. No personal or sensitive information is tracked, logged, or sent to remote servers.
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Is multisite supported?
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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
Translate “Greyfu Login Captcha” into your language.
Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.0.0
- Initial release with math captcha support and Pro-ready structure.