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RMGCaptcha Math Guard – Math CAPTCHA for Login and WooCommerce
RMGCaptcha Math Guard adds a GDPR-friendly, math-based CAPTCHA to protect WordPress login, WooCommerce, and Contact Form 7 forms from spam, fake registrations, and brute-force attacks. No external services, no tracking, and fully WordPress.org compliant. Features: WordPress login protection (captcha
PricingFree downloadThe WordPress.org download is free. Pro versions, add-ons or external services may cost extra.
CompatibilityRequires WordPress 5.8 and PHP 7.4.
SourceWordPress plugins · Oct 23, 2026
01 / Source details
RMGCaptcha Math Guard adds a GDPR-friendly, math-based CAPTCHA to protect WordPress login, WooCommerce, and Contact Form 7 forms from spam, fake registrations, and brute-force attacks. No external services, no tracking, and fully WordPress.org compliant.
Features:
- WordPress login protection (captcha on wp-login.php)
- Contact Form 7 integration via [pmcMathcaptcha] / [pmcMathcaptcha*]
- WooCommerce login and registration protection
- Lightweight spam protection without Google reCAPTCHA or third-party tracking
- Configurable difficulty and operations (Addition/Subtraction/Multiplication/Random)
- Hide captcha for logged-in users
- Custom error message support
- Optional rate limiting and honeypot
- Failed login log + logged user list (admin pages)
- Translation-ready
02 / Source details
- 01Upload the rmgcaptcha-math-guard folder to the /wp-content/plugins/ directory.
- 02Activate the plugin through the ‘Plugins’ menu in WordPress.
- 03Go to Settings > RMGCaptcha Math Guard to configure.
03 / Source details
Frequently asked questions.
How do I add it to Contact Form 7?
Use the form tag [pmcMathcaptcha] or [pmcMathcaptcha*] in your CF7 form.
Does it work for logged-in users?
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