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><strong>Captcha by BestWebSoft</strong> is the premier spam protection and security plugin for WordPress, designed to safeguard your website’s forms from spam and malicious submissions. This plugin provides robust protection for login, registration, password recovery, comments, WooCommerce checkout, and custom forms using advanced captcha solutions, including Math captcha and OCR-friendly captcha.</p>
<p>Enhance your website’s security and user experience with versatile captcha options that are easy to set up and manage, ensuring uninterrupted protection against spam without the need for code modifications. Choose from Invisible captcha, Character recognition captcha, and Slide captcha to customize your protection strategy. Block bots effectively with powerful math-based challenges or smooth, user-friendly sliding interactions.</p>
<p>Captcha by BestWebSoft integrates seamlessly with popular plugins and is optimized for spam protection on WordPress forms, making it ideal for WooCommerce, Contact Form 7, and other integrations. Secure your site today with a lightweight, fast, and reliable solution that prioritizes both security and user experience.</p>
<p><strong>Stop spam now with the most effective WordPress captcha solution!</strong></p>
<p><a href="https://bestwebsoft.com/demo-for-captcha/?ref=readme" rel="nofollow ugc">View Demo</a></p>
<h4>Free Features</h4>
<ul>
<li><strong>Add Captcha to:</strong>
<ul>
<li>Login form</li>
<li>Registration form</li>
<li>Reset password form</li>
<li>Comments form</li>
<li>Protected post password form</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/contact-form/?k=7f973058ee3bd3a18934b5e13b857d6f" rel="nofollow ugc">Contact Form</a></li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/car-rental-v2/?k=9feda3ea8564e0b0707c5434786ddf24" rel="nofollow ugc">Car Rental V2 Pro</a></li>
<li>Custom forms</li>
</ul>
</li>
<li><strong>Choose Captcha Type:</strong>
<ul>
<li>Invisible Captcha</li>
<li>Character Recognition Captcha</li>
<li>Math Captcha (simple math operations like addition, subtraction, multiplication)</li>
<li>Slide Captcha</li>
</ul>
</li>
<li><strong>Enhance Captcha Protection with:</strong>
<ul>
<li>Letters</li>
<li>Numbers</li>
<li>Images</li>
</ul>
</li>
<li><strong>Hide Captcha for:</strong>
<ul>
<li>Registered users in comments form</li>
</ul>
</li>
<li><strong>Additional Features:</strong>
<ul>
<li>Set captcha submission time limit</li>
<li>Settings for displaying captchas by Weekdays and Hours</li>
<li>Refresh captcha option</li>
<li>Edit captcha title and notifications</li>
<li>Compatible with the latest WordPress version</li>
<li>User-friendly settings for quick setup without coding</li>
<li>Comprehensive documentation and tutorial videos</li>
<li>Multilingual and RTL ready</li>
</ul>
</li>
</ul>
<h3>Pro Features</h3>
<p>All Free features plus:</p>
<ul>
<li><strong>Enhanced Compatibility:</strong>
<ul>
<li>Contact Form 7 (since v3.4)</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/subscriber/?k=ac02c12d6e17bc91f4cc636eec0a0348" rel="nofollow ugc">Subscriber</a></li>
<li>Jetpack Contact Form</li>
<li>MailChimp for WordPress</li>
<li>Ninja Forms</li>
<li>Gravity Forms</li>
<li>WPForms</li>
<li>Caldera Forms</li>
<li>Formidable Contact Form</li>
<li>MemberPress</li>
</ul>
</li>
<li><strong>WooCommerce Integration:</strong>
<ul>
<li>Login form</li>
<li>Register form</li>
<li>Lost password form</li>
<li>Checkout billing form</li>
</ul>
</li>
<li><strong>bbPress Integration:</strong>
<ul>
<li>New Topic form</li>
<li>Reply form</li>
</ul>
</li>
<li><strong>BuddyPress Integration:</strong>
<ul>
<li>Registration form</li>
<li>Comments form</li>
<li>Create a Group form</li>
</ul>
</li>
<li><strong>wpForo Integration:</strong>
<ul>
<li>Login form</li>
<li>Registration form</li>
<li>New Topic form</li>
<li>Reply form</li>
</ul>
</li>
<li><strong>Divi Integration:</strong>
<ul>
<li>Contact Form</li>
<li>Login Form</li>
</ul>
</li>
<li><strong>LearnDash and BuddyBoss Integration:</strong>
<ul>
<li>LearnDash Login and Registration forms</li>
<li>BuddyBoss Registration form</li>
</ul>
</li>
<li><strong>Elementor Pro Integration:</strong>
<ul>
<li>Elementor Contact 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><strong>Advanced Features:</strong>
<ul>
<li>Hide captcha for allowed IP addresses</li>
<li>Merge IP addresses from <a href="https://bestwebsoft.com/products/wordpress/plugins/limit-attempts/?k=c6b924d096b75a288daf0e49a58f93c2" rel="nofollow ugc">Limit Attempts</a> plugin with Captcha Allow List</li>
<li>Configure all subsites on the network</li>
<li>Set captcha submission time limits for individual forms</li>
<li>Image packages with hand-drawn digits</li>
<li>Add and activate unlimited image packages simultaneously</li>
<li>Customize Slide Captcha appearance</li>
<li>Block disposable emails</li>
<li>Add custom code via plugin settings page</li>
<li>Receive support responses within one business day (<a href="https://bestwebsoft.com/support-policy/" rel="nofollow ugc">Support Policy</a>)</li>
</ul>
</li>
</ul>
<p><a href="https://bestwebsoft.com/products/wordpress/plugins/captcha/?k=2d2d85a3c277bf3489697c9a9ff2d352" rel="nofollow ugc"><strong>Upgrade to Pro Now</strong></a></p>
<p>If you have feature suggestions or ideas you’d like to see in the plugin, we’d love to hear from you! <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/captcha/captcha-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="https://www.youtube.com/watch?v=r0Noz2bYAq8" rel="nofollow ugc">[Video] Purchase, Installation, Configuration Tutorial</a></li>
<li><a href="https://www.youtube.com/watch?v=5UyK8tS3oqM" rel="nofollow ugc">[Video] User Guide</a></li>
</ul>
<h4>Help & Support</h4>
<p>Visit our <a href="https://support.bestwebsoft.com/" rel="nofollow ugc">Help Center</a> if you have any questions; our friendly Support Team is ready to assist you.</p>
<h4>Affiliate Program</h4>
<p>Earn a 20% commission by selling premium WordPress plugins and themes by BestWebSoft — <a href="https://bestwebsoft.com/affiliate/" rel="nofollow ugc">Join the Affiliate Program</a></p>
<h4>Translation</h4>
<ul>
<li>Arabic (ar_AR) (thanks to Albayan Design Hani Aladoli)</li>
<li>Bangla (bn_BD) (thanks to <a href="mailto:mehdi.akram@gmail.com" rel="nofollow ugc">SM Mehdi Akram</a>, www.shamokaldarpon.com)</li>
<li>Belarusian (bel) (thanks to <a href="mailto:natasha.diatko@gmail.com" rel="nofollow ugc">Natasha Diatko</a>)</li>
<li>Brazilian Portuguese (pt_BR) (thanks to <a href="mailto:brenojac@gmail.com" rel="nofollow ugc">Breno Jacinto</a>, www.iconis.org.br)</li>
<li>Bulgarian (bg_BG) (thanks to <a href="mailto:paharaman@gmail.com" rel="nofollow ugc">Nick</a>)</li>
<li>Catalan (ca) (thanks to <a href="mailto:psiete@gmail.com" rel="nofollow ugc">Psiete</a>)</li>
<li>Chinese (zh_CN) (thanks to <a href="mailto:416441872@qq.com" rel="nofollow ugc">TIM</a>, <a href="mailto:beijingtours@foxmail.com" rel="nofollow ugc">Jack Chen</a>, www.jackchen.im)</li>
<li>Taiwan (zh_TW) (thanks to <a href="mailto:ch.unk.ai.ma.o@gmail.com" rel="nofollow ugc">Kaiconan</a>)</li>
<li>Croatian (hr) (thanks to <a href="mailto:daniel@croteh.com" rel="nofollow ugc">Daniel</a>)</li>
<li>Czech (cs_CZ) (thanks to <a href="mailto:kucerami@gmail.com" rel="nofollow ugc">Michal Kučera</a> www.n0lim.it)</li>
<li>Danish (da_DK) (thanks to Byrial Ole Jensed)</li>
<li>Dutch (nl_NL) (thanks to <a href="mailto:byrial@vip.cybercity.dk" rel="nofollow ugc">Bart Duineveld</a>)</li>
<li>Estonian (et) (thanks to Ahto Tanner)</li>
<li>Greek (el) (thanks to Aris, www.paraxeno.net)</li>
<li>Farsi/Persian (fa_IR) (thanks to <a href="mailto:mostafaasadi73@gmail.com" rel="nofollow ugc">Mostafa Asadi</a>, www.ma73.ir, <a href="mailto:Morteza.Gholami@Yahoo.Com" rel="nofollow ugc">Morteza Gholami</a>)</li>
<li>Finnish (fi) (thanks to Mikko Sederholm)</li>
<li>French (fr_FR) (thanks to Martel Benjamin, <a href="mailto:lcapronnier@yahoo.com" rel="nofollow ugc">Capronnier luc</a>)</li>
<li>German (de_DE) (thanks to Thomas Hartung, <a href="mailto:lothar.schiborr@web.de" rel="nofollow ugc">Lothar Schiborr</a>)</li>
<li>Hebrew (he_IL) (thanks to Sagive SEO)</li>
<li>Hindi (hi_IN) (thanks to <a href="mailto:ash.pr@outshinesolutions.com" rel="nofollow ugc">Outshine Solutions</a>, www.outshinesolutions.com)</li>
<li>Hungarian (hu_HU) (thanks to <a href="mailto:solarside09@gmail.com" rel="nofollow ugc">Peter Aprily</a>)</li>
<li>Japanese (ja) (thanks to Foken)</li>
<li>Indonesian (id_ID) (thanks to <a href="mailto:nasroel@al-badar.net" rel="nofollow ugc">Nasrulhaq Muiz</a>, www.al-badar.net)</li>
<li>Italian (it_IT) (thanks to <a href="mailto:marco@blackstudio.it" rel="nofollow ugc">Marco</a>)</li>
<li>Latvian (lv) (thanks to <a href="mailto:juris.o@gmail.com" rel="nofollow ugc">Juris O</a>)</li>
<li>Lithuanian (lt_LT) (thanks to <a href="mailto:arnas.metal@gmail.com" rel="nofollow ugc">Arnas</a>)</li>
<li>Norwegian (nb_NO) (thanks to Tore Hjartland)</li>
<li>Polish (pl_PL) (thanks to Krzysztof Opuchlik)</li>
<li>Portuguese (pt_PT) (thanks to <a href="mailto:jp.jp@sapo.pt" rel="nofollow ugc">João Paulo Antunes</a>)</li>
<li>Romanian (ro_RO) (thanks to Ciprian)</li>
<li>Russian (ru_RU)</li>
<li>Serbian (sr_RS) (thanks to Radovan Georgijevic)</li>
<li>Slovak (sk_SK) (thanks to Branco Radenovich)</li>
<li>Slovenian (sl_SI) (thanks to <a href="mailto:uros.klopcic@gmail.com" rel="nofollow ugc">Uroš Klopčič</a>, www.klopcic.net)</li>
<li>Spanish (es_ES)</li>
<li>Swedish (sv_SE) (thanks to Christer Rönningborg, <a href="mailto:blittan@xbmc.org" rel="nofollow ugc">Blittan</a>)</li>
<li>Tagalog (tl) (thanks to <a href="mailto:rjalali@languageconnect.net" rel="nofollow ugc">Roozbeh Jalali</a>, www.languageconnect.net)</li>
<li>Turkish (tr_TR) (thanks to Can Atasever, www.canatasever.com)</li>
<li>Ukrainian (uk)</li>
<li>Vietnamese (vi_VN) (thanks to NDT Solutions)</li>
</ul>
<p>Some translations may be incomplete. We continuously add new features that require translation. To create or update a language pack, send the text of PO and MO files to <a href="https://support.bestwebsoft.com/hc/en-us/requests/new" rel="nofollow ugc">BestWebSoft</a>. Download the latest Poedit version <a href="https://www.poedit.net/download.php" rel="nofollow ugc">here</a>.</p>
<h4>Recommended Plugins</h4>
<ul>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/limit-attempts/?k=c6b924d096b75a288daf0e49a58f93c2" rel="nofollow ugc">Limit Attempts</a> — Protect your WordPress site against brute force attacks by limiting login attempts.</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/updater/?k=0864088de1701a5e104ffb77c6d7011c" rel="nofollow ugc">Updater</a> — Automatically check and update your WordPress core, plugins, and themes to the latest versions.</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/contact-form/?k=7f973058ee3bd3a18934b5e13b857d6f" rel="nofollow ugc">Contact Form</a> — A simple and essential contact form plugin for any WordPress site.</li>
<li><a href="https://bestwebsoft.com/products/wordpress/plugins/subscriber/?k=2ce0827916414c9c8576110f13560030" rel="nofollow ugc">Subscriber</a> — Add an email newsletter sign-up form to WordPress posts, pages, and widgets. Collect and manage subscriber data effectively.</li>
</ul>
<h4>Credits</h4>
<ul>
<li>This plugin includes a license verification mechanism to ensure the authenticity of your license key and provide access to premium features and updates. The verification process involves securely connecting to our external service hosted on the BestWebSoft website: <a href="https://bestwebsoft.com" rel="nofollow ugc">BestWebSoft</a>.</li>
<li><a href="https://bestwebsoft.com/privacy-policy/" rel="nofollow ugc">Privacy Policy</a></li>
<li><a href="https://bestwebsoft.com/end-user-license-agreement/" rel="nofollow ugc">End User License Agreement</a></li>
</ul>


Captcha by BestWebSoft – Advanced Spam Protection, Math & OCR-Friendly Captcha for Site Forms

thanks

1 The Ultimate Spam Protection Plugin Using Captcha for WordPress Forms.

Really Simple CAPTCHA vs Captcha by BestWebSoft – Advanced Spam Protection, Math & OCR-Friendly Captcha for Site Forms