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Adds CAPTCHA anti-spam methods to WordPress on the forms for comments, registration, lost password, login, or all.

By: Mike Challis.

(103)
Last Updated: 3 days ago
300,000+ active installs
Compatible up to: 4.7.1

Todd Lahman's comment spam blocking plugin that blocks automated spam with zero false positives.

By: Todd Lahman.

(42)
Last Updated: 1 year ago
60,000+ active installs
Compatible up to: 4.4.6

Defeat automated spambots (even the new 'learning' bots with dynamically named hidden fields) by adding a client side generated checkbox.

By: Andy Bailey.

(34)
Last Updated: 2 years ago
40,000+ active installs
Compatible up to: 4.0.14

Powerful anti-spam plugin that eliminates blog comment spam. Finally, you can enjoy a spam-free WordPress blog! Includes contact form.

By: Pole Position Marketing and Aziz.

(5)
Last Updated: 4 months ago
40,000+ active installs
Compatible up to: 4.5.5

This plugin utilizes Google reCAPTCHA to help your blog stay clear of spams. BWP reCAPTCHA supports no CAPTCHA reCAPTCHA, Contact Form 7 and Akismet.

By: Khang Minh.

(57)
Last Updated: 1 year ago
30,000+ active installs
Compatible up to: 4.4.6

To protect your Blog from automated spambots, this plugin adds invisible formfields to your comment form.

By: kubi23.

(12)
Last Updated: 4 days ago
10,000+ active installs
Compatible up to: 4.7.1

Smart invisible captcha for wordpress comments

By: Andrey Sorvin.

(11)
Last Updated: 4 years ago
10,000+ active installs
Compatible up to: 3.5.2

This plugin prevents users from commenting or viewing your website if a comment of theirs has been marked as spam.

By: Lelkoun.

(4)
Last Updated: 5 years ago
10,000+ active installs
Compatible up to: 3.3.2

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

By: and Donncha O Caoimh.

(2)
Last Updated: 7 years ago
10,000+ active installs
Compatible up to: 3.0.5

The AVH First Defense Against Spam plugin gives you the ability to block spammers before any content is served.

By: petervanderdoes.

(14)
Last Updated: 6 months ago
10,000+ active installs
Compatible up to: 4.5.5

Asks the visitor making the comment to answer a simple math question. This is intended to prove that the visitor is a human being and not a spam robot

By: Michael_.

(1)
Last Updated: 6 years ago
9,000+ active installs
Compatible up to: 3.0.5

Sabre is an acronym for Simple Anti Bot Registration Engine. It's a set of counter measures against spam registration on your blog.

By: dlo.

(11)
Last Updated: 5 years ago
8,000+ active installs
Compatible up to: 3.3.2

Performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam.

By: Michael_.

(3)
Last Updated: 9 years ago
7,000+ active installs
Compatible up to: 2.9.2
(23)
Last Updated: 7 months ago
7,000+ active installs
Compatible up to: 4.6.2

Several types of captcha to protect your site in one easy to use plugin.

By: wppal.

(10)
Last Updated: 4 years ago
6,000+ active installs
Compatible up to: 3.5.2
(4)
Last Updated: 5 months ago
6,000+ active installs
Compatible up to: 4.6.2

Simple IP Ban is a lightweight ip / user agent ban plugin.

By: Sandor Kovacs.

(5)
Last Updated: 1 month ago
6,000+ active installs
Compatible up to: 4.7.1

WP Anti Spam can anti automated spambots or anti spams by"comment","ip","name","email","url".

By: boliquan.

(3)
Last Updated: 2 years ago
6,000+ active installs
Compatible up to: 4.0.14

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