willjenkins

Using the most effective features of other spam programs. Astounding Spam Prevention effectively guards against comment spam and registration spam without the use of a Captcha. 
This is a fork of the original Stop Spammers Spam Prevention and uses some of the code, but it is greatly simplified so it is not as aggressive and will not prevent a user from logging in. It does not interfere with jetpack and does not know about WooCommerce so there are no conflicts. Unlike Stop Spammers it does not check logins, but only checks registrations and comments. 
It also repairs many bugs that I found in the Stop Spammers plugin and has many new methods for detecting spam.
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See my books and contacts: https://linktr.ee/keithpgraham

Astounding Spam Prevention

Based on Stop Spammers, this lightweight spam stopper is still aggressive enough to stop 99% of the spammers and robots hitting your site. It is careful to never lock a webmaster out of WordPress. The options interface is slick and the logging is very very useful. 
I use it on 11 of my sites and I have my clients all using it.
Thanks to Will and all the effort he put in to make this plugin extremely useful while still being very very safe.

Works like a charm

It kills the spam

Got dozens of registrations after installing and activating all options. It made no difference what options were set. Uninstalled.

Made no difference to the spam

Very effective anti-spam plugin that eliminates comment spam, and registration spam. Combines many effective methods for identifying spammers and keep …

Hizbul Bahar

Main feature and goal of this plugin ‘Block Spam Comments’ is to detect spam comments and create a shield to protect from submit this unwanted robot comments without using captcha. Plugin size is less than 1 KB, so no tension about storage size. Install and Activate then enjoy spam free website.

Astounding Spam Prevention vs Block Spam Comments