greyfu

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.
<h3>Third Party Services</h3>
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.
<h3>Support / Contact</h3>
For issues or questions, please contact us: 
Email: hello@greyfu.com 
Website: https://greyfu.com

Greyfu Login Captcha

A lightweight captcha that protects your WordPress login page from automated bot attacks using a simple math challenge.

Ralf Naumann

eSherpa Login Guard effectively and intelligently protects your WordPress site from brute-force attacks – Swiss precision, completely without external dependencies.
Key Features:
<ul>
<li>Honeypot-first bot defense: JavaScript Honeypot detects non-browser bots and triggers immediate lockout logic.</li>
<li>Protected username trap: Immediate lockout for defined usernames (e.g., “admin”, “test”), independent of the regular counter.</li>
<li>Proactive User-Agent blocking: Block known bot signatures before login processing (exact match or substring mode).</li>
<li>Blocked User-Agent attempt log: Separate log table for blocked User-Agent requests including matching pattern.</li>
<li>WordPress hardening options: Disable XML-RPC (with fake-user honeypot response), hide REST user endpoint, and block author archive enumeration.</li>
<li>Optional bot password capture: Store attempted passwords from detected JS-honeypot bots for incident analysis.</li>
<li>Neutral login error option: Hide username enumeration by using neutral WordPress login error responses.</li>
<li>Live security visibility: Live alarm in admin, lockout badge in menu, and detailed failed-attempt logs with IP/User-Agent filters.</li>
<li>Progressive lockout durations: Lockout time increases on repeat offenses (e.g., 15 → 30 → 60 → 120 minutes).</li>
<li>Login page guidance: Clear countdown and “X attempts remaining” notice for transparent lock state.</li>
<li>Privacy-compliant: IPs stored only as anonymized hashes.</li>
<li>Automatic cleanup of old failed attempts (configurable).</li>
<li>Mobile-friendly admin tables: Horizontal scrolling for wide security tables on small screens, including swipe hint.</li>
<li>Email notification to admin on attacks against existing users.</li>
</ul>
Developed in Switzerland – fast, clean, performant, and multilingual ready.
Compatible with WordPress 6.9 and tested up to PHP 8.5.3.

eSherpa Login Guard

Intelligent login protection with honeypot detection, WordPress hardening, and a clear security admin overview.

Greyfu Login Captcha vs eSherpa Login Guard