RMGCaptcha Math Guard – Math CAPTCHA for Login and WooCommerce
A lightweight math CAPTCHA and spam protection plugin for WordPress login, WooCommerce, and Contact Form 7 forms.
Solid choice
RMGCaptcha Math Guard is a solid plugin choice in 2026, with a few things worth checking first. It runs on 60+ sites, is rated 5/5 and was last updated 3 weeks ago, and scores 75/100 on our health check.
- Actively developed — last update 3 weeks ago
- Tested with the latest WordPress (7.1)
- Small user base (60+ active installs)
- Very few reviews so far
How does it stack up?
Side-by-side on installs, updates, ratings & support
Daily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where RMGCaptcha Math Guard stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| captcha | #59 |
| login security | >100 |
| math captcha | #5 |
| spam protection | >100 |
| woocommerce | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 5 from 1 reviews
About RMGCaptcha Math Guard
From the official readme · v1.3.1Description
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
Installation
- Upload the
rmgcaptcha-math-guardfolder to the/wp-content/plugins/directory. - Activate the plugin through the ‘Plugins’ menu in WordPress.
- Go to Settings > RMGCaptcha Math Guard to configure.
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?
You can hide CAPTCHA for logged-in users via the settings page.
Does it keep logs?
Yes. It provides separate admin pages for Logged User List and Failed Login Log with a clear button for each list.
Changelog
1.3.1
- Add Custom Admin Login URL settings with a configurable secret login slug
- Return 404 for direct wp-login.php and unauthenticated wp-admin access
- Keep failed-login messages and Math CAPTCHA on the custom login URL
- Support WordPress installations in a subdirectory
1.3.0
- Add Email 2FA (Two-Factor Authentication) for WordPress login
- Add IP Blocker to manually block specific IP addresses from accessing the site
- Add Country Block to restrict access by country
- Add Login Alerts with email notifications on successful and failed logins
- Add Temporary Login feature to generate time-limited, passwordless login links
- Add rate limiting with configurable max attempts and block duration
- Improve plugin stability and code quality across all modules
1.2.7
- Add declare(strict_types=1) across all PHP files for stricter type safety
- Add typed properties to all classes (PHP 7.4+ feature) for better static analysis
- Add parameter type hints and return type declarations throughout the codebase
- Fix extra closing markup bug on Help & Support admin page
- Add file_exists safety check before loading Kenjo Insights SDK (prevents fatal errors if kci folder is missing)
- Clean up rmgc_version option plus all KCI options and transients during plugin uninstall
- Remove redundant instanceof check in log_login() (type hint guarantees WP_User)
- Ensure consistent string casting for nonce, answer, and token values before validation
1.2.6
- Fix admin “Save Settings” button missing styles (add .rmgc-save-btn CSS)
- Add plugin header with branding and version badge to settings page
- Fix public captcha CSS not loading on frontend and login page
- Fix HTML class mismatch between captcha markup and stylesheet
- Improve user avatar with indigo-purple gradient in log pages
- Add rate limiting with configurable max attempts and block duration
- Add honeypot spam protection field
- Add failed login log and logged user list admin pages
- Add Help & Support admin submenu page
1.2.5
- Add Help & Support menu to admin panel
- Add Support Development section with donation link
- Improve admin interface with modern design
1.1.4
- Complete UI redesign with modern gradient color scheme
- Improve admin settings page with cleaner layout
- Add modern toggle switches for settings
- Enhance form inputs and select boxes design
- Update logs page with better table design
- Implement full-screen responsive design
- Remove complex tab system for simpler user experience
- Fix CSS loading issues by enqueuing stylesheets separately
- Optimize spacing and padding throughout admin interface
For developers
Is this your plugin? Show off the numbers.
Add a live badge to your site, docs or GitHub README. It updates on its own — no account needed.
Best RMGCaptcha Math Guard alternatives
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FAQ
RMGCaptcha Math Guard: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Oct 1, 2026
Is RMGCaptcha Math Guard free?
Yes. RMGCaptcha Math Guard is free to download and use from the official WordPress.org plugin directory.
Is RMGCaptcha Math Guard safe to use in 2026?
RMGCaptcha Math Guard is a solid plugin choice in 2026, with a few things worth checking first. It runs on 60+ sites, is rated 5/5 and was last updated 3 weeks ago, and scores 75/100 on our health check.
How many websites use RMGCaptcha Math Guard?
RMGCaptcha Math Guard is active on 60+ WordPress websites and has been downloaded 1,157 times since it launched in March 2026. It was downloaded 316 times in the last 30 days.
Does RMGCaptcha Math Guard work with WordPress 7.1?
Yes. The developer has tested RMGCaptcha Math Guard up to WordPress 7.1.2, the latest release. It requires WordPress 5.8 or newer.
What PHP version does RMGCaptcha Math Guard need?
RMGCaptcha Math Guard requires PHP 7.4 or higher. Most hosts run PHP 8.x today, so it works on any modern WordPress hosting.
When was RMGCaptcha Math Guard last updated?
The latest version, 1.3.1, was released on September 8, 2026 (3 weeks ago).
Who makes RMGCaptcha Math Guard?
RMGCaptcha Math Guard is developed and maintained by Ridhwan Ahsan.
What are the best alternatives to RMGCaptcha Math Guard?
The most popular alternatives to RMGCaptcha Math Guard are SiteGuard WP Plugin (500K+ installs), CF7 Apps (300K+ installs) and Really Simple CAPTCHA (300K+ installs).
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