Conditional CAPTCHA

Asks commenters to complete a simple CAPTCHA if they don't have a previously approved comment, or if Akismet thinks their comment is spam.

Samir Shah 9,000+ active installations Tested with 4.7.6 Updated 11 months ago

TypePad AntiSpam for WordPress

TypePad AntiSpam is a plugin that integrates WordPress
blogs with Six Apart's spam blocking service.

Matt Mullenweg, Six Apart Ltd. 800+ active installations Tested with 2.5 Updated 9 years ago