WP-Hashcash

Client-side javascript blocks all spam bots. XHTML 1.1 compliant.


Elliott Back 10,000+ active installs Tested with 3.0.5 Updated 6 years ago

AVH First Defense Against Spam

The AVH First Defense Against Spam plugin gives you the ability to block spammers before…


Peter van der Does 10,000+ active installs Tested with 4.5.9 Updated 11 months ago

Conditional CAPTCHA

Asks commenters to complete a simple CAPTCHA if they don't have a previously approved comment,…


Samir Shah 9,000+ active installs Tested with 4.7.5 Updated 7 months ago

Anti-Captcha (anti-spam botblocker)

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


Filidor Wiese 8,000+ active installs Tested with 4.0.0 Updated 3 years ago

Math Comment Spam Protection

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


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

WPCommentCleaner

WPCommentCleaner is a very simple tool which can batch process SPAM, un-apporved and approved comments.


Quazi Touheed 7,000+ active installs Tested with 3.5.2 Updated 4 years ago

Bulk Comments Management

This plugin allows administrators to globally delete comments (spam, trash, unapproved comments), enable/disable comments on…


Yakup Hoca 7,000+ active installs Tested with 3.5.2 Updated 4 years ago

SpamReferrerBlock

This plugin prevents spam referrer attacks by filtering your incoming traffic.


Didier Sampaolo 7,000+ active installs Tested with 4.1.18 Updated 2 years ago

Spammer Blocker

This plugin prevents users from commenting or viewing your website if a comment of theirs…


Lelkoun 7,000+ active installs Tested with 3.3.2 Updated 5 years ago

Simple Trackback Validation

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


Michael Woehrer 7,000+ active installs Tested with 2.9.2 Updated 7 years ago

Sabre

Sabre is an acronym for Simple Anti Bot Registration Engine. It's a set of counter…


Didier Lorphelin 7,000+ active installs Tested with 3.3.2 Updated 5 years ago