Takayuki Miyoshi

<p>Really Simple CAPTCHA does not work alone and is intended to work with other plugins. It is originally created for <a href="https://contactform7.com/" rel="nofollow ugc">Contact Form 7</a>, however, you can use it with your own plugin.</p>
<p>Note: This product is “really simple” as its name suggests, i.e., it is not strongly secure. If you need perfect security, you should try other solutions.</p>
<h4>How does it work?</h4>
<p>Really Simple CAPTCHA does not use PHP “Sessions” for storing states, unlike many other PHP CAPTCHA solutions, but stores them as temporary files. This allows you to embed it into WordPress without worrying about conflicts.</p>
<p>When you generate a CAPTCHA, Really Simple CAPTCHA creates two files for it; one is an image file of CAPTCHA, and the other is a text file which stores the correct answer to the CAPTCHA.</p>
<p>The two files have the same (random) prefix in their file names, for example, “a7hk3ux8p.png” and “a7hk3ux8p.txt.” In this case, for example, when the respondent answers “K5GF” as an answer to the “a7hk3ux8p.png” image, then Really Simple CAPTCHA calculates hash of “K5GF” and tests it against the hash stored in the “a7hk3ux8p.txt” file. If the two match, the answer is confirmed as correct.</p>
<h4>How to use with your plugin</h4>
<p>Note: Below are instructions for plugin developers.</p>
<p>First, create an instance of ReallySimpleCaptcha class:</p>
<pre><code>$captcha_instance = new ReallySimpleCaptcha();
</code></pre>
<p>You can change the instance variables as you wish.</p>
<pre><code>// Change the background color of CAPTCHA image to black
$captcha_instance->bg = array( 0, 0, 0 );
</code></pre>
<p>See really-simple-captcha.php if you are interested in other variables.</p>
<p>Generate a random word for CAPTCHA.</p>
<pre><code>$word = $captcha_instance->generate_random_word();
</code></pre>
<p>Generate an image file and a corresponding text file in the temporary directory.</p>
<pre><code>$prefix = wp_rand();
$captcha_instance->generate_image( $prefix, $word );
</code></pre>
<p>Then, show the image and get an answer from respondent.</p>
<p>Check the correctness of the answer.</p>
<pre><code>$correct = $captcha_instance->check( $prefix, $the_answer_from_respondent );
</code></pre>
<p>If the $correct is true, go ahead. Otherwise, block the respondent — as it would appear not to be human.</p>
<p>And last, remove the temporary image and text files, as they are no longer in use.</p>
<pre><code>$captcha_instance->remove( $prefix );
</code></pre>
<p>That’s all.</p>
<p>If you wish to see a live sample of this, you can try <a href="https://contactform7.com/captcha/" rel="nofollow ugc">Contact Form 7</a>.</p>


Really Simple CAPTCHA

Needed this for an installation with custom forms. I used the plugin developers instructions and was able to make a fully custom implementation based on server side validation within 30 minutes. No more spam bots misusing the forms. Thank you!

Great work - easy to implement

Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin.

yonifre

WpMaspik

<p>Maspik is an advanced WordPress anti-spam plugin that blocks bots, fake leads, and unwanted submissions across your entire site — without hurting real users.</p>
<p>Trusted by thousands of websites worldwide. Works automatically on activation.</p>
<p>👉 Works with all major form plugins. No CAPTCHA. No coding. Immediate results.</p>
<h3>Why block spam with Maspik?</h3>
<ul>
<li>🚀 <strong>Instant protection</strong> – Works as soon as you activate the plugin.</li>
<li>🎯 <strong>High success rate</strong> – Better protection than traditional CAPTCHA.</li>
<li>🔍 <strong>Smart detection</strong> – Identifies spam patterns automatically with advanced rules and optional AI spam detection.</li>
<li>🌐 <strong>Wide compatibility</strong> – Supports all major form plugins and WordPress core forms (comments, registration).</li>
<li>🛠️ <strong>Fully customizable</strong> – Blacklists, IP blocking, character limits, link limits, countries, languages, and more.</li>
<li>👥 <strong>Spam Block Guarantee</strong> – We are committed to helping you block spam. See the <a href="#-spam-block-guarantee---for-all-users" rel="nofollow ugc">Spam Block Guarantee</a> section.</li>
</ul>
<h3>Key Features</h3>
<p>✅ Works instantly with popular form plugins and core WordPress forms<br />
✅ No CAPTCHA required – silent protection for your visitors<br />
✅ Forbidden keywords list system (Blacklist/Blocklist) – block any word, phrase, or pattern you want per field type<br />
✅ IP blacklist & API integrations<br />
✅ Phone number validation<br />
✅ Multiple honeypot methods and advanced key checks<br />
✅ Multi-language support<br />
✅ Maspik Matrix – Cloud-based Multi-layer spam protection engine</p>
<h3>Detailed Features – Advanced Spam Protection & Filtering</h3>
<h3>Maspik Matrix – Advanced Multi-Layer Spam Protection</h3>
<p>Maspik Matrix is a powerful layered spam filter that combines multiple detection methods into one unified protection system.</p>
<p>This engine performs several checks in parallel to increase accuracy and reduce false positives, including:</p>
<ul>
<li>IP reputation and risk scoring  </li>
<li>Pattern matching and keyword analysis  </li>
<li>Heuristic behavior checks  </li>
<li>Structural and content-based evaluation  </li>
<li>AI Spam Check scoring mechanisms  </li>
<li>Learn from spam submissions and improve over time</li>
</ul>
<p>Maspik Matrix provides stronger, faster, and more reliable spam detection by evaluating each submission through multiple layers of protection simultaneously.</p>
<p>Maspik includes <strong>100 free Matrix checks</strong> so you can start protecting forms immediately.<br />
<strong>Pro users get unlimited Matrix checks</strong>.</p>
<p>Note – Local checks are not counted towards the monthly limit, only API calls are counted.</p>
<h3>Blacklisting by Field Type</h3>
<ul>
<li><strong>Text fields/Text area fields</strong> (e.g. name, subject, message)</li>
<li><strong>Email fields</strong> (supports regex/wildcard patterns)</li>
<li><strong>URL fields</strong></li>
<li><strong>Phone number fields</strong> (regex/wildcard support)</li>
</ul>
<h3>Blocking Capabilities</h3>
<ul>
<li>Specific IP addresses</li>
<li>Spam submissions in:
<ul>
<li>WordPress comments</li>
<li>WordPress registration forms</li>
<li>Contact forms from supported plugins (see list below)</li>
</ul>
</li>
<li>Option to block submissions containing emojis in textarea fields</li>
<li>Blocking bot-generated submissions</li>
<li>Advanced key checks to detect automated submissions</li>
</ul>
<h3>Advanced Blocking</h3>
<ul>
<li>Honeypot fields (multiple strategies)</li>
<li>IP verification (100 checks/month in free version)</li>
<li>Advanced key check engine</li>
</ul>
<h3>Character Control</h3>
<ul>
<li>Maximum characters in text fields</li>
<li>Maximum characters in textarea fields</li>
</ul>
<h3>Link Limitation</h3>
<ul>
<li>Limit the number of links allowed in textarea fields (for example, 0–1 links)</li>
</ul>
<h3>API Integrations</h3>
<ul>
<li><strong>Proxycheck.io</strong> – Check IP addresses against proxy/VPN/TOR</li>
<li><strong>AbuseIPDB.com</strong> – Check IP addresses against abuse/spam/malicious/proxy/VPN/TOR</li>
<li><strong>Numverify.com</strong> – Validate phone numbers to block spam phone numbers</li>
</ul>
<h3>Spam Log</h3>
<ul>
<li>Review blocked submissions</li>
<li>Understand why and how spam was blocked</li>
<li>Use logs to fine-tune your spam protection</li>
</ul>
<h3>Detailed Statistics</h3>
<ul>
<li>Track how many spam submissions were blocked</li>
<li>Analyze patterns</li>
<li>Monitor protection over time</li>
<li>Advanced spam statistics dashboard in the admin</li>
</ul>
<h3>Supported Forms</h3>
<p>Maspik integrates seamlessly with a wide range of popular form plugins and WordPress core forms:</p>
<ul>
<li>Elementor Forms</li>
<li>Elementor Atomic Forms</li>
<li>Contact Form 7</li>
<li>Hello Plus</li>
<li>Ninja Forms</li>
<li>Everest Forms</li>
<li>Formidable Forms</li>
<li>JetFormBuilder</li>
<li>Forminator Forms</li>
<li>Fluent Forms</li>
<li>Bricks Builder Forms</li>
<li>Breakdance Builder Forms</li>
<li>BuddyPress</li>
<li>Bitforms</li>
<li>Metform</li>
<li>WordPress comments</li>
<li>WordPress registration form</li>
<li>Custom PHP forms</li>
<li>WPForms*  </li>
<li>Gravity Forms*  </li>
<li>WooCommerce registration form*  </li>
<li>WooCommerce review*</li>
</ul>
<p>(*) Pro license required.</p>
<h3>Pro Version Features 🌟</h3>
<p>Upgrade to Maspik Pro to unlock powerful additional features:</p>
<ul>
<li>⭐ Maspik Matrix – Unlimited checks</li>
<li>⭐ Custom spam dashboard for multiple sites – manage all spam settings from one place</li>
<li>⭐ Country-based filtering – block spam by country or allow only specific countries</li>
<li>⭐ Language-based filtering – block spam by language or allow only specific languages</li>
<li>⭐ Settings import/export</li>
<li>⭐ Premium support</li>
</ul>
<p>Learn more and get Maspik Pro at:<br />
https://wpmaspik.com/?readme-file</p>
<h3>Important Note</h3>
<p>Be cautious when selecting words to blacklist, as every website has different needs.<br />
For example, if you are a digital marketing agency and blacklist the word “SEO”, you may lose some valid leads.</p>
<p>The plugin is provided “as is” and the user assumes full responsibility for configuring and using it appropriately for their specific needs.</p>
<p>Maspik is GDPR compliant.</p>
<h3>Support & Community</h3>
<ul>
<li>🚀 <a href="https://wpmaspik.com/documentation/getting-started/?readme-file" rel="nofollow ugc">Get Started guide</a></li>
<li>📚 <a href="https://wpmaspik.com/documentation/?readme-file" rel="nofollow ugc">Documentation</a></li>
<li>💬 <a href="https://www.facebook.com/groups/maspik" rel="nofollow ugc">Community Forum</a></li>
<li>🐛 <a href="https://wpmaspik.com/#support?readme-file" rel="nofollow ugc">Report Issues</a></li>
<li>💡 <a href="https://wpmaspik.com/#support?readme-file" rel="nofollow ugc">Feature Requests</a></li>
<li>💰 <a href="https://wpmaspik.com/get-maspik-pro-for-free-share-your-expertise/?readme-file" rel="nofollow ugc">Receive Maspik Pro for free</a></li>
<li>💖 <a href="https://wordpress.org/support/plugin/contact-forms-anti-spam/reviews/#new-post" rel="ugc">Support us with a 5-star review</a></li>
<li>✨ <a href="https://wpmaspik.com/?readme-file" rel="nofollow ugc">WP Maspik Website</a></li>
</ul>
<h3>🛡️ Spam Block Guarantee – for all users</h3>
<p>We stand behind our protection. If spam is still getting through your forms, our team is here to help and guide you to block it.</p>
<h3>Getting Help is Easy</h3>
<ol>
<li>Join our <a href="https://www.facebook.com/groups/maspik" rel="nofollow ugc">Community Forum</a></li>
<li>Create a new post with:
<ul>
<li>Your website URL and form page URL (optional)</li>
<li>Description of the spam you are receiving</li>
<li>Screenshot or text of sample spam submissions</li>
<li>Your Maspik version</li>
<li>Screenshot or export of your current Maspik settings</li>
</ul>
</li>
</ol>
<p>Our team will guide you step-by-step to block the spam effectively.</p>


Maspik – Ultimate Spam Protection


Easily the best solution for fighting spam. Their support is top notch as well.


Excellent solution

No more fake leads or unwanted submissions — Maspik blocks spam instantly across all forms without using CAPTCHA.

Really Simple CAPTCHA vs Maspik – Ultimate Spam Protection