Olly - OWMC

Many people use WP as a fully fledged CMS, building sites which don’t even have a blog. In such cases, the WP comments functionality is a waste of pixels and needs completely removing. Comment Crusher was made to quickly and thoroughly clear your install of every trace of comment functionality.
For many years I have used this collection of hooks to achieve this end. So came the idea to put it in a plugin and make it available to the masses. Simply activate this plugin and never worry about comments again.
When activated, even though all pre-existing comments on your site won’t be visible, they do still exist in your database. This plugin doesn’t delete them. And so deactivating the plugin will restore full comments functionality and reveal all previous comments again.
This plugin does not collect any data, neither does it modify your database.
<ul>
<li>Disable comment and trackback support from all post-types</li>
<li>Deactivate comments and pings on the front end</li>
<li>Hide all existing comments</li>
<li>Remove the comment metabox from the dashboard</li>
<li>Remove comments link from the toolbar</li>
<li>Remove the admin menu link for comments</li>
<li>Redirect anyone trying to access the comments admin page </li>
</ul>
This plugin was built using the <a href="https://wppb.me" rel="nofollow ugc">WP Plugin Boilerplate</a> and the custom functionality code I think goes back to <a href="https://gist.github.com/mattclements/10a997775894c7a0eba1" rel="nofollow ugc">Matt Clements in 2013</a>.

Comment Crusher

Disable and remove comments on your WP site.

webvitaly

kudlav

This is fork of successful Anti-spam plugin v5.5 written by webvitalii, for more info visit <a href="https://github.com/kudlav/anti-spam/" rel="nofollow ugc">GitHub Fork</a>. 
From version 5.6 maintained by kudlav.
<ul>
<li><a href="https://github.com/kudlav/anti-spam/" rel="nofollow ugc">GitHub</a></li>
</ul>
Anti-spam Reloaded plugin blocks 100% of automatic spam messages in comments section and also blocks all trackbacks.No captcha required.
Plugin is simple and easy to use: just install it and it just works.
Blocked comments can be stored in the Spam area and converted to regular comments if needed.
Anti-spam Reloaded plugin is GDPR compliant and does not store any other user data except of the behaviour mentioned above.
Plugin blocks spam only in comments section.. 
Plugin does not block manual spam (submitted by spammers manually via browser).
<h3>Compatibility</h3>
All modern browsers and IE11+ are supported. 
Anti-spam Reloaded plugin works with disabled JavaScript. Users with disabled JavaScript should manually fill current year before submitting the comment.
Server compatibility:
<ul>
<li>WordPress 3.3 – 6.5</li>
<li>PHP 5.6 – 8.2</li>
<li>Doesn’t use jQuery</li>
</ul>
Plugin is incompatible with:
<ul>
<li>Disqus</li>
<li>Jetpack Comments</li>
<li>AJAX Comment Form</li>
<li>bbPress</li>
</ul>
If site has caching plugin enabled and cache is not cleared or if theme does not use ‘comment_form’ action 
and there is no plugin inputs in comments form – plugin tries to add hidden fields automatically using JavaScript.
<h3>How does it work?</h3>
The blocking algorithm is based on 2 methods: ‘invisible js-captcha’ and ‘invisible input trap’ (aka honeypot technique).
<h4>‘invisible js-captcha’</h4>
The ‘invisible js-captcha’ method is based on fact that bots does not have JavaScript on their user-agents. 
Extra hidden field is added to comments form. 
It is the question about the current year. 
If the user visits site, than this field is answered automatically with JavaScript, is hidden by JavaScript and CSS and invisible for the user. 
If the spammer will fill year-field incorrectly – the comment will be blocked because it is spam.
<h4>‘invisible input trap’</h4>
The ‘invisible input trap’ method is based on fact that almost all the bots will fill inputs with name ’email’ or ‘url’. 
Extra hidden field is added to comments form. 
This field is hidden for the user and user will not fill it. 
But this field is visible for the spammer. 
If the spammer will fill this trap-field with anything – the comment will be blocked because it is spam.

Comment Crusher vs Anti-spam Reloaded