As of April 2026, Cartpauj Register Captcha is a WordPress captcha plugin with 1.0K+ active installations and a 4.2/5 rating from 24 reviews. It has been downloaded 38K+ times in total. Requires WordPress 6.0+ and PHP false+. Available on WordPress.org since 2011. Downloads are up 65% this week. Top alternative: SiteGuard WP Plugin.
Cartpauj Register Captcha does one simple task. It prevents SPAM signups through WordPress’s default registration form. There are no settings to configure. Just activate and watch those SPAM sign-ups fade away! Requires openssl PHP library.
Built with a modified version of Phoca Captcha PHP library
Icon by Freepik
I think it used to work, however now it shows the error if you get the captcha wrong, but still registers the user, so it’s useless against spam registrations. I say it used to work, as my site didn’t get many spam registrations, but recently I got 30 overnight, so I’ve had to turn registrations off until I get an alternative arranged. I switched it back on to test one more time and instantly got a spam registration, so don’t bother installing this any more.
Works as expected.
spam bot registroval 2500 redaktorů 🙁
Fine! The most important thing is that it works unlike the rest.
The spam signup has gotten worse since installing this plugin.
| WordPress | 6.0+ requiredTested up to 6.8.5 |
| PHP | false+ required |
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.