In this part of WordPress Security Plugins, we're posting about the TOP Captcha plugins available for WordPress:
- Block By Spam Math follows a simple math question approach to protect the registration, login and comment forms from spambots.
- SI CAPTCHA Anti-Spam adds CAPTCHA anti-spam methods to WordPress comment form, registration form, login, or all.
- yaCAPTCHA is the most useful antispam plugin. It helps you block comment spam from automated bots.
- NuCaptcha is a captcha-based platform that uses motion video to authenticate human web interactions. Publishers have a choice between old style, static Captcha security and NuCaptcha platform; a multi purpose product which provides industry leading security combined with brand messaging, advertising and unique user engagement.
- Math Comment Spam Protection asks visitor making the comment to answer a simple math question intended to prove that visitor is a human being and not a spam robot.
Als, check the first part Best Useful WordPress Comment Security Plugins.