Math Comment Spam Protection

Asks the visitor making the comment to answer a simple math question. This is intended…


Michael Woehrer 8,000+ active installations Tested with 3.0.5 Updated 7 years ago

Anti-Captcha (anti-spam botblocker)

Anti-Captcha is a transparent spam solution that does not require any end-user interaction.


Filidor Wiese 7,000+ active installations Tested with 4.0.0 Updated 3 years ago

Simple Trackback Validation

Performs a simple but very effective test on all incoming trackbacks in order to stop…


Michael Woehrer 6,000+ active installations Tested with 2.9.2 Updated 8 years ago

Simple Trackback Validation with Topsy Blocker

REPLACEMENT of the original Simple Trackback Validation Plugin from Miachel. Performs a simple but very…


Tobias Herde 6,000+ active installations Tested with 4.8.2 Updated 1 month ago

Blackhole for Bad Bots

Protect your site against bad bots by trapping them in a virtual blackhole.


Jeff Starr 5,000+ active installations Tested with 4.8.2 Updated 2 months ago

WP Spam Fighter

Comment spam prevention without moderation, captchas or questions


Henri Benoit 3,000+ active installations Tested with 4.1.19 Updated 3 years ago

Block Spam By Math Reloaded

This plugin protects your WordPress and Buddypress login, comments, and new user/new blog signup process…


James Pegram 3,000+ active installations Tested with 3.3.2 Updated 5 years ago

BuddyPress Security Check

Combat spam registrations for a BuddyPress-powered site using Google's reCAPTCHA


Shea Bunge 2,000+ active installations Tested with 4.7.6 Updated 6 months ago

BuddyPress Captcha

This plugin adds Google's reCAPTCHA form to your BuddyPress' registration page to keep your community…


Hardeep Asrani 2,000+ active installations Tested with 4.1.19 Updated 2 years ago

Quiz

Reduces spam and troll comments by requiring commenters to answer a question.


Andy Skelton, Stephen Rider and Mark Jaquith 1,000+ active installations Tested with 4.1.19 Updated 3 years ago

WP referrer spam blacklist (fight 521+ Referrer Spammers in (Google/Piwik) Analytics)

WordPress plugin to fight with 500+ referrer spammers (like semalt, buttons-for-website and many more).


Rolands Umbrovskis 1,000+ active installations Tested with 4.8.2 Updated 4 months ago

yaCAPTCHA

yaCAPTCHA is a CAPTCHA plugin for WordPress that helps you block comment spam from automated…


Rémy Roy 1,000+ active installations Tested with 3.0.5 Updated 7 years ago

Centrora Security™

Centrora Security plugin is excellent for security management. It incorporates firewall, dedicated malware scanners to…


Centrora Security 1,000+ active installations Tested with 4.8.2 Updated 3 weeks ago