Takayuki Miyoshi

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.
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.
<h4>How does it work?</h4>
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.
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.
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.
<h4>How to use with your plugin</h4>
Note: Below are instructions for plugin developers.
First, create an instance of ReallySimpleCaptcha class:
<pre><code>$captcha_instance = new ReallySimpleCaptcha();
</code></pre>
You can change the instance variables as you wish.
<pre><code>// Change the background color of CAPTCHA image to black
$captcha_instance->bg = array( 0, 0, 0 );
</code></pre>
See really-simple-captcha.php if you are interested in other variables.
Generate a random word for CAPTCHA.
<pre><code>$word = $captcha_instance->generate_random_word();
</code></pre>
Generate an image file and a corresponding text file in the temporary directory.
<pre><code>$prefix = wp_rand();
$captcha_instance->generate_image( $prefix, $word );
</code></pre>
Then, show the image and get an answer from respondent.
Check the correctness of the answer.
<pre><code>$correct = $captcha_instance->check( $prefix, $the_answer_from_respondent );
</code></pre>
If the $correct is true, go ahead. Otherwise, block the respondent — as it would appear not to be human.
And last, remove the temporary image and text files, as they are no longer in use.
<pre><code>$captcha_instance->remove( $prefix );
</code></pre>
That’s all.
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>.

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.

WebFactory

Manesh Timilsina

Nilambar Sharma

WP Concern

<a href="https://getwpcaptcha.com/" rel="nofollow ugc">Advanced Google reCAPTCHA</a> protects your WordPress site from spam comments & brute force login attacks using captcha. This captcha plugin, quickly adds Google reCAPTCHA and other captcha tests to WordPress comment form, login form, and other forms.
Using Advanced Google reCAPTCHA (most popular captcha on the market), you’ll be safe from spam comments and protect user accounts, WooCommerce, Easy Digital Downloads, BuddyPress and other forms from brute-force login attacks.
reCaptcha works for:
<ul>
<li>Login Form</li>
<li>Registration Form</li>
<li>Reset Password Form</li>
<li>Comment Form</li>
<li>BuddyPress Form</li>
<li>WooCommerce Form</li>
<li>Easy Digital Downloads (EDD) Login Form</li>
<li>Easy Digital Downloads (EDD) Registration Form</li>
</ul>
Captcha uses these 3rd party libs:
<ul>
<li>Chart.js, 2017 Nick Downie, MIT</li>
<li>DataTables, 2008-2017 SpryMedia Ltd, MIT</li>
<li>moment.js, Tim Wood, Iskren Chernev, MIT</li>
<li>SweetAlert 2, github.com/Sweetalert2/Sweetalert2, MIT</li>
<li>tooltipster, www.heteroclito.fr/modules/tooltipster/, MIT</li>
</ul>

Advanced Google reCAPTCHA

It meets all expectations to have recaptcha in custom pages/login page

Recaptcha in all pages

Works great!


It's really help and working for me in WordPress and woo commerce forms.



thanks. 


The Best free recaptcha plugin


Setting up the Advanced Google reCAPTCHA plugin was a breeze. The developers have done an outstanding job in simplifying the integration process. With clear instructions and user-friendly options, I was up and running in no time.


A Game-Changer for Website Security

well for my all website


Works great and it is easy to configure. Be careful if you programmatically log users into your site, because the captcha will have to be resolved.


Simple and powerful

Great Plugin

Great


After Install this Plugin I am not able to login with my username and password It is may be changing my login details ...Do not Install ... I am requesting the developer to make a quick fix for this ... 


After Install This Plugin Now I am not able to Login

Captcha protection against spam comments & brute force login attacks using Google reCAPTCHA.

Really Simple CAPTCHA vs Advanced Google reCAPTCHA