edward_plainview

When entering a comment the plugin will load some Javascript values – unique for the visitor – to ensure that the user is a real person.
If Javascript is not enabled in the visitor’s browser, an error message will be shown when submitting the comment.
The spam protection is not enabled for logged-in users.

Plainview Comment Antispam

Prevent comment spam automatically by using Javascript.

Sverigedemokraterna IT

Prevents comment spam using various, admin-selectable techniques.
Available in:
<ul>
<li>English</li>
<li>Swedish</li>
</ul>
Logging is handled by <a href="https://wordpress.org/extend/plugins/threewp-activity-monitor/" rel="ugc">ThreeWP Activity Monitor</a>. See the list of logged activities to enable logging of caught spam.
Most spam is caught using “extra fields”. Rarely will spam require the use of “no author website” also. Extremely rarely will a spam bot be smart enough to include the hidden fields, leave them empty and leave the author URL empty.
Catching that last kind of spambot will require other measures.
<h4>Extra fields</h4>
Two extra fields are inserted into the comment form and hidden from view using CSS. They are to be left empty, and say as much, in order for the comment to pass.
Bots that spam by inserting fake POSTs will not have the required, invisible fields in the POST – rejecting the comment.
Bots that fill in all form fields will automatically fill in these extra fields – the comment will be rejected.
<h4>No author website</h4>
Comment authors are usually allowed to fill in their URLs. Selecting this technique will only allow comments that have an empty author URL field.
Bots that fill in all form fields will fail this test.
Note that you will need to edit your template to hide the author url input from view using <code>display: none</code>.

Plainview Comment Antispam vs SD Simple Antispam