Concise Studio

<h4>Algorithm</h4>
<ol>
<li>Plugin generates token on the backend side.</li>
<li>Plugin adds hidden field for token in each form which will use method “POST” after rendering of the page.</li>
<li>Plugin inserts token in the field after user’s interaction with site.</li>
</ol>
<h4>For developers</h4>
<p>Antispam will automatically check submissions of the regular forms but ignores all AJAX requests.<br />
If you want to change this behaviour, you can use filter <code>concise_antispam_need_to_validate_token</code>.<br />
See example:</p>
<p><em>Disable Antispam for some forms:</em></p>
<pre><code>add_filter("concise_antispam_need_to_validate_token", function($needToValidateToken) {
    if (!empty($_POST['do-not-check-antispam-token'])) {
        $needToValidateToken = false;
    }

    return $needToValidateToken;
});
</code></pre>
<p>You can also always manually call <code>\Concise\Antispam::validateTokenOrDie()</code> in your custom handler.</p>
<h3>Formidable Forms integration</h3>
<p>For proper work disable the honeypot checking in the forms</p>


Concise Antispam

Very simple antispam plugin. Users do not need to enter any captcha, working completely on background. No need to administer: just install the plugin  …

willjenkins

<p>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.<br />
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.<br />
It also repairs many bugs that I found in the Stop Spammers plugin and has many new methods for detecting spam.</p>
<h3>Donate</h3>
<p>Please buy one of my books and give it a good review. I worked hard on these books, and they are worth reading.<br />
See my books and contacts: https://linktr.ee/keithpgraham</p>
<p></p>


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 …

Concise Antispam vs Astounding Spam Prevention