Mailster Cool Captchav1.4.0
Add a self-hosted image captcha to Mailster newsletter signup forms—block bot subscriptions without Google API keys.
Alternatives to Mailster reCaptcha
Plugins below are selected for functional relevance and current directory signals. Active-install counts do not affect this ranking.
Relevant replacements
WordPress plugins with similar use cases
Compatibility and update metadata provide context, not a quality guarantee. Review each plugin’s details for your site.
Protect your WordPress forms against spam and bots with Google reCAPTCHA V3 and V2.
CaptchaFox for WordPressv2.3.0
CaptchaFox is an easy-to-use and GDPR compliant bot protection service. Protect your WordPess forms from malicious bot traffic!
Stop spam and bots across WordPress, WooCommerce, WPForms, Contact Form 7, and more with Google reCAPTCHA or Cloudflare Turnstile.
Add a captcha to your WordPress and WooCommerce login, registration, and password forms to stop spam, bots, and brute-force attacks.
Protect Contact Form 7, WPForms, WooCommerce, login, comments and more with Cloudflare Turnstile, reCAPTCHA, hCaptcha, or no-signup challenges.
Invisible spam protection for every form, login and checkout. No puzzles, no checkboxes, no lost visitors — a CAPTCHA your users never see.
Captcha Codev3.33
GDPR compatible captcha anti-spam protection for login form, comments form, registration form & lost password form. Eliminate spam with captcha.
Help reduce automated spam on WordPress and WooCommerce forms with Turnstile, reCAPTCHA, hCaptcha or built-in keyless checks.
Protect login and registration forms from spam bots using Google reCAPTCHA, Cloudflare Turnstile, and Math Captcha.