Kasuga

Tiny Comment Spam Blocker is a lightweight yet powerful plugin designed to protect your WordPress comments from spam. It employs five different techniques to detect and block unwanted comments:
<ol>
<li>Nonce Verification – Ensures that the comment form submission is genuine.</li>
<li>Submission Time Check – Blocks comments submitted too quickly to prevent bots.</li>
<li>Honeypot Field – Hidden field that traps automated spam bots.</li>
<li>User Agent Validation – Detects suspicious User-Agent strings and blocks them.</li>
<li>Forbidden Word Filtering – Blocks submissions containing words or phrases from a configurable list within the comment body, email address, or IP address.</li>
<li>JavaScript-Based Human Interaction Detection – Sets a verification token when mouse movement, scrolling, or touch interaction is detected.</li>
<li>(Option) Block Non-Japanese Comments – Blocks comments that do not contain Japanese characters (Hiragana, Katakana, or Han/Kanji), primarily targeting machine-translated or foreign spam.</li>
</ol>
These filters are applied in order: if a comment passes the first check, it proceeds to the second, and so on, until all checks are applied or the comment is blocked.
Additional features:
<ul>
<li>Option to log detected spam in a local log file (up to 1.0 MB).</li>
<li>Optional email notifications when spam is detected.</li>
<li>Easy settings page in the WordPress admin panel.</li>
</ul>
<h3>Settings</h3>
The plugin provides the following settings in the WordPress admin panel:
<ul>
<li>Enable Spam Protection – Toggle the spam protection on or off. When disabled, all anti-spam checks are skipped.</li>
<li>Save Spam Detection Log – Enable or disable logging of detected spam. Logs are saved in a local file up to 1.0 MB within the WordPress uploads directory.</li>
<li>Notification Email Address – Enter an email address to receive notifications when spam is detected. Leave blank to disable email notifications.</li>
<li>Minimum Submission Time (seconds) – Set the minimum allowed time between loading the comment form and submitting a comment. Comments submitted faster than this threshold are considered spam.</li>
<li>Forbidden Words List – Enter one forbidden word, phrase, or IP address per line. Submissions containing these entries in the comment body, email address, or IP address will be blocked. Case is insensitive.
<ul>
<li>Example: 
viagra 
online pharmacy 
spam@email.com 
164.138.205.72</li>
</ul>
</li>
<li>Block No Japanese Comments – If enabled, this becomes the final check: Comments that contain Japanese characters (Hiragana, Katakana, or Kanji) will be automatically accepted after passing other security checks. Comments without Japanese characters will be blocked.</li>
</ul>
<h3>Arbitrary Section</h3>
This plugin is designed to be lightweight and fast, ensuring minimal impact on site performance while providing robust protection against comment spam.

Tiny Comment Spam Blocker

A simple and lightweight yet rock-solid plugin that blocks comment spam using multiple automatic detection methods.

Martín Gómez

RaiolaNetworks

Honeypot Anti-Spam stops comment spam in WordPress using the honeypot technique – with no captcha, no puzzles and nothing for your visitors to solve.
Spam bots automatically fill in a hidden field that real visitors never see. The moment they do, the comment is flagged as spam. The result: cleaner comments, zero friction for genuine users and no annoying CAPTCHA.
<h4>Why Honeypot Anti-Spam?</h4>
<ul>
<li>No captcha – completely invisible to visitors, nothing to type or click.</li>
<li>Zero configuration – install, activate, done. There are no settings to touch.</li>
<li>Lightweight and fast – a tiny script with no bloat and no impact on page speed.</li>
<li>Privacy friendly – no external services, no tracking, no data leaves your site.</li>
<li>Native WordPress comments – works out of the box with the standard comment form.</li>
</ul>
<h4>How the honeypot technique works</h4>
The honeypot antispam technique adds a hidden field to your comment form via JavaScript. A legitimate visitor never sees this field and therefore never fills it in. Spam bots, however, detect it and fill it in, so the comment or submission is immediately classified as spam.
Honeypot Anti-Spam has NO options and NO configuration. To get it working you only have to install and activate it. Nothing else.
<ul>
<li><a href="https://raiolanetworks.com/blog/anti-spam-wordpress/" title="Information and support" rel="nofollow ugc">More information and support</a></li>
</ul>
<h3>Bundled by default with</h3>
Raiola Networks WordPress hosting service.

Honeypot Anti-Spam

La mejor alternativa al antiguo plugin anti-spam!

El nuevo Anti-spam

Elección segura contra el SPAM en las páginas web.

Mi (nuevo) plugin de referencia anti-spam


Forget about all the other antispam plugins out there. They are all unnecessarily big. This is just what you need, a simple tool to block the spam for comments.


Just what you need

Stop comment spam in WordPress with the honeypot technique. No captcha, no setup, lightweight and invisible to your visitors.

Tiny Comment Spam Blocker vs Honeypot Anti-Spam