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.

bestwebsoft

<p>reCaptcha plugin is an effective security solution that protects your WordPress website forms from spam entries while letting real people pass through with ease.  It can be used for login, registration, password recovery, comments, popular contact forms, and other. reCAPTCHA Version 3, Version 2, Invisible are included.</p>
<p>Users are required to confirm that they are not a robot before the form can be submitted. It’s easy for people and hard for bots.</p>
<p><a href="https://bestwebsoft.com/demo-for-google-captcha/?ref=readme" rel="nofollow ugc">View Demo</a></p>
<p><iframe loading="lazy" title="Stay Safe with reCaptcha by BestWebSoft Plugin" width="750" height="422" src="https://www.youtube.com/embed/L2BziEOL3Fg?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe></p>
<h4>Free Features</h4>
<ul>
<li>Add reCaptcha to:
<ul>
<li>Registration form</li>
<li>Login form</li>
<li>Reset password form</li>
<li>Protected post password form</li>
<li>Comments form</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/contact-form/?k=56575444122cff9ab3ee3e640efb001a" rel="nofollow ugc">Contact Form</a></li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/testimonials/" rel="nofollow ugc">Testimonials</a></li>
<li><a href="https://wordpress.org/plugins/bws-login-register" rel="ugc">Login & Register Form</a></li>
<li>Custom form</li>
</ul>
</li>
<li>Hide reCaptcha for the allowlisted IP addresses</li>
<li>Disable the submit button</li>
<li>Validity check of keys in admin panel</li>
<li>Available reCaptcha themes for Version 2:
<ul>
<li>Light (default)</li>
<li>Dark</li>
</ul>
</li>
<li>Compatible with <a href="https://bestwebsoft.com/products/wordpress/plugins/limit-attempts/?k=1b1865c556920231995b35c3ed889415" rel="nofollow ugc">Limit Attempts</a></li>
<li>Hide reCaptcha in your forms for certain user roles</li>
<li>Hide reCaptcha Badge (Invisible and V3)</li>
<li>Supports reCaptcha:
<ul>
<li>Version 2</li>
<li>Version 3</li>
<li>Invisible reCAPTCHA</li>
</ul>
</li>
<li>Add custom code via plugin settings page</li>
<li>Compatible with latest WordPress version</li>
<li>Incredibly simple settings for fast setup without modifying code</li>
<li>Detailed step-by-step documentation and videos</li>
<li>Multilingual and RTL ready</li>
<li>Edit error message</li>
</ul>
<blockquote>
<p><strong>Pro Features</strong></p>
<p>All features from Free version included plus:</p>
<ul>
<li>Compatible with:
<ul>
<li>Contact Form 7 (since v 3.4)</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/subscriber/?k=e6d1742fcf1806a39afac207f7920cf3" rel="nofollow ugc">Subscriber</a></li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/multilanguage/?k=e48e145002e4b2472e568a81d171b888" rel="nofollow ugc">Multilanguage</a></li>
<li>Jetpack contact form</li>
<li>Fast Secure Contact Form</li>
<li>MailChimp for WordPress</li>
<li>Ninja Forms</li>
<li>Gravity Forms</li>
<li>WPForms</li>
<li>Caldera Forms</li>
<li>Elementor Pro Contact Forms</li>
<li>LearnDash Registration Page</li>
<li>BuddyBoss</li>
<li>Formidable Forms</li>
<li>Forminator Forms</li>
</ul>
</li>
<li>Compatible with WooCommerce:
<ul>
<li>Login form</li>
<li>Register form</li>
<li>Lost password form</li>
<li>Checkout billing form</li>
</ul>
</li>
<li>Compatible with Divi:
<ul>
<li>Divi Builder Contact form</li>
<li>Divi Builder Login form</li>
<li>Divi Theme Contact form</li>
</ul>
</li>
<li>Compatible with bbPress:
<ul>
<li>New Topic form</li>
<li>Reply form</li>
</ul>
</li>
<li>Compatible with BuddyPress:
<ul>
<li>Registration form</li>
<li>Comments form</li>
<li>Create a Group form</li>
</ul>
</li>
<li>Compatible with Forums – wpForo:
<ul>
<li>Login form</li>
<li>Registration form</li>
<li>New Topic form</li>
<li>Reply form</li>
</ul>
</li>
<li>Compatible with Ultimate Member:
<ul>
<li>Login form</li>
<li>Registration form</li>
<li>Profile form</li>
</ul>
</li>
<li>Compatible with BWS Login Register Form:
<ul>
<li>Login form</li>
<li>Registration form</li>
<li>Forgot Password form</li>
</ul>
</li>
<li>Select reCaptcha language manually</li>
<li>Activate reCaptcha on certain Weekdays and Hours</li>
<li>Change size: normal or compact (for version 2)</li>
<li>Configure all subsites on the network</li>
<li>Block disposable emails</li>
<li>Get answer to your support question within one business day (<a href="https://bestwebsoft.com/support-policy/" rel="nofollow ugc">Support Policy</a>)</li>
</ul>
<p><a href="https://bestwebsoft.com/products/wordpress/plugins/google-captcha/?k=c4f2e3054fdbaca8a2b61554cbb9638c" rel="nofollow ugc">Upgrade to Pro Now</a></p>
</blockquote>
<p>If you have a feature suggestion or idea you’d like to see in the plugin, we’d love to hear about it! <a href="https://support.bestwebsoft.com/hc/en-us/requests/new" rel="nofollow ugc">Suggest a Feature</a></p>
<h4>Documentation & Videos</h4>
<ul>
<li><a href="https://bestwebsoft.com/documentation/recaptcha/recaptcha-user-guide/" rel="nofollow ugc">[Doc] User Guide</a></li>
<li><a href="https://bestwebsoft.com/documentation/how-to-install-a-wordpress-product/how-to-install-a-wordpress-plugin/" rel="nofollow ugc">[Doc] Installation</a></li>
<li><a href="https://bestwebsoft.com/documentation/how-to-purchase-a-wordpress-plugin/how-to-purchase-wordpress-plugin-from-bestwebsoft/" rel="nofollow ugc">[Doc] Purchase</a></li>
<li><a href="http://www.youtube.com/watch?v=RUJ9VwZLFSY" rel="nofollow ugc">[Video] Installation Instruction</a></li>
<li><a href="https://www.youtube.com/watch?v=X-ccRdEFcM0" rel="nofollow ugc">[Video] Purchase, Installation & Configuration</a></li>
<li><a href="https://www.youtube.com/watch?v=ZFv6txtic0Y" rel="nofollow ugc">[Video] User Guide</a></li>
</ul>
<h4>Help & Support</h4>
<p>Visit our Help Center if you have any questions, our friendly Support Team is happy to help – <a href="https://support.bestwebsoft.com/" rel="nofollow ugc">https://support.bestwebsoft.com/</a></p>
<h4>Affiliate Program</h4>
<p>Earn 20% commission by selling the premium WordPress plugins and themes by BestWebSoft – <a href="https://bestwebsoft.com/affiliate/" rel="nofollow ugc">https://bestwebsoft.com/affiliate/</a></p>
<h4>Translation</h4>
<ul>
<li>Czech (cs_CZ) (thanks to <a href="mailto:kucerami@gmail.com" rel="nofollow ugc">Michal Kučera</a>, www.n0lim.it, <a href="mailto:info@pamadessoft.cz" rel="nofollow ugc">PaMaDeSSoft</a>, www.pamadessoft.cz)</li>
<li>French (fr_FR)</li>
<li>German (de_DE)</li>
<li>Japanese (ja)</li>
<li>Italian (it_IT)</li>
<li>Portuguese (pt_BR)</li>
<li>Romanian (ro_RO)</li>
<li>Russian (ru_RU)</li>
<li>Spanish (es_ES)</li>
<li>Turkish (tr_TR) (thanks to <a href="mailto:admin@lordiz.com" rel="nofollow ugc">Lordiz</a>, www.lordiz.com)</li>
<li>Ukrainian (uk)</li>
</ul>
<p>Some of these translations are not complete. We are constantly adding new features which should be translated. If you would like to create your own language pack or update the existing one, you can send <a href="https://codex.wordpress.org/Translating_WordPress" rel="nofollow ugc">the text of PO and MO files</a> to <a href="https://support.bestwebsoft.com/hc/en-us/requests/new" rel="nofollow ugc">BestWebSoft</a> and we’ll add it to the plugin. You can download the latest version of the program for work with PO and MO <a href="http://www.poedit.net/download.php" rel="nofollow ugc">files Poedit</a>.</p>
<h4>Recommended Plugins</h4>
<ul>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/updater/?k=f47f3eb3d739725d592249dbd129f7ff" rel="nofollow ugc">Updater</a> – Automatically check and update WordPress website core with all installed plugins and themes to the latest versions.</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/contact-form/?k=56575444122cff9ab3ee3e640efb001a" rel="nofollow ugc">Contact Form</a> – Simple contact form plugin any WordPress website must have.</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/subscriber/?k=e6d1742fcf1806a39afac207f7920cf3" rel="nofollow ugc">Subscriber</a> – Add email newsletter sign up form to WordPress posts, pages and widgets. Collect data and subscribe your users.</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/multilanguage/?k=e48e145002e4b2472e568a81d171b888" rel="nofollow ugc">Multilanguage</a> – Translate WordPress website content to other languages manually. Create multilingual pages, posts, widgets, menus, etc.</li>
</ul>
<h4>Credits</h4>
<ul>
<li>lib/recaptchalib.php – Copyright © 2007. Mike Crawford, Ben Maurer (reCAPTCHA – <a href="http://recaptcha.net" rel="nofollow ugc">http://recaptcha.net</a>). All Rights Reserved.</li>
<li>The plugin uses Google Recaptcha (Google LLC) services to process data and protect against spam. <a href="https://www.google.com/recaptcha/" rel="nofollow ugc">https://www.google.com/recaptcha/</a> Terms of service <a href="https://policies.google.com/terms" rel="nofollow ugc">https://policies.google.com/terms</a>. Privacy Policy <a href="https://policies.google.com/privacy" rel="nofollow ugc">https://policies.google.com/privacy</a>.</li>
<li>This plugin incorporates a license verification mechanism to ensure the authenticity of your license key and provide access to premium features and updates. The verification process involves connecting securely to our external service hosted at BestWebSoft website <a href="https://bestwebsoft.com" rel="nofollow ugc">https://bestwebsoft.com</a>. Privacy Policy <a href="https://bestwebsoft.com/privacy-policy/" rel="nofollow ugc">https://bestwebsoft.com/privacy-policy/</a>. End user license agreement <a href="https://bestwebsoft.com/end-user-license-agreement/" rel="nofollow ugc">https://bestwebsoft.com/end-user-license-agreement/</a>.</li>
</ul>


reCaptcha by BestWebSoft

Protect WordPress website forms from spam entries with Google reCAPTCHA.

Really Simple CAPTCHA vs reCaptcha by BestWebSoft