Martín Gómez

RaiolaNetworks

Honeypot Anti-Spam

Stop comment spam in WordPress with the honeypot technique. No captcha, no setup, lightweight and invisible to your visitors.

webvitalii

kudlav

Anti-spam Reloaded

SzMake

Sz Comment Filter

No spam in comments. blocked by Invisible internal token-code with ajax.This is not used CAPTCHA.

Timur Kamaev

Kama SpamBlock

Light and invisible method to block auto-spam when a spam comment is posted. Pings and trackbacks check for real backlinks.

Ostap Mykhaylyak

SpamScout

Light and invisible method to block spam when spam is posted.

Jennifer M. Dodd

Spammer Silent Treatment

Remove known spammer email addresses from wp_mail()'s To, Cc, and Bcc fields.

Rajan Vijayan

WP Spam Protecter

Protuct your blog about spam comments and instantaneously junk messages.

<ul>
<li><a href="http://web-profile.net/wordpress/plugins/fortify/" title="Plugin page" rel="nofollow ugc">Fortify</a></li>
<li><a href="http://web-profile.net/donate/" title="Support the development" rel="nofollow ugc">Donate</a></li>
<li><a href="https://github.com/webvitalii/fortify" title="Fork" rel="nofollow ugc">GitHub</a></li>
</ul>
Fortify plugin blocks automatic spam in comments section. No captcha.
Plugin is easy to use: just install it and it just works.
Blocked comments can be stored in the Spam area if needed. This can be enabled/disabled via Settings page. This is useful for testing and debug purpose. Blocked spam comments can be easily converted to regular comments if needed.
Fortify plugin is GDPR compliant and does not store any other user data except of the behavior mentioned above.
Plugin blocks spam only in comments section.
After installing the Fortify plugin try to submit a comment on your site being logged out. 
If you get an error – you may check the solution in the <a href="https://wordpress.org/support/plugin/fortify" rel="ugc">Support section</a> or submit a new topic with detailed description of your problem.

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