manfer

Contact Form 7 is an excellent WordPress plugin but its captcha functionality is limited to a simple captcha.
CF7 BWP reCAPTCHA Plugin adds reCAPTCHA capabilities to contact form 7.
This plugin is the result of the study on how CF7 API, WP APIs and BWP Captcha plugin works, in order to code the necessary hooks to add recaptcha to CF7, including a settings page to configure the theme and language you want to use.
<h4>Requirements</h4>
<ul>
<li>You need the <a href="https://wordpress.org/extend/plugins/contact-form-7/" title="Contact Form 7 Plugin" rel="ugc">Contact Form 7</a> plugin to be installed and activated.</li>
<li>You need the <a href="https://wordpress.org/extend/plugins/bwp-recaptcha/" title="Better WordPress reCAPTCHA Plugin" rel="ugc">BWP reCAPTCHA</a> plugin to be installed and activated.</li>
</ul>
<h4>Settings</h4>
The settings of the BWP reCAPTCHA plugin are used by default. You can change that behaviour on the settings page of the plugin under:
BWP reCAPT -> CF7 Options
<h4>Feedback</h4>
If you like the plugin please rate it. If you don’t like it, please contact us so we can address the problem or feature request.
Please if you find the plugin is not working for you and you report it, fill the form with what exactly do you think is not working. Thanks.
This plugin is provided as is by manfer (http://manfersite.tk).

Contact Form 7 BWP reCAPTCHA Extension

This plugin provides a new tag for the Contact Form 7 Plugin. It allows the usage of a reCAPTCHA field provided by the BWP reCAPTCHA Plugin.

bozdoz

<a href="https://wordpress.org/plugins/jetpack/" rel="ugc">Jetpack</a> makes it easy to add contact forms to your WordPress site, but you may want a simple way to add a <a href="https://www.google.com/recaptcha/" rel="nofollow ugc">Google reCAPTCHA</a> to prevent spam. This plugin will manipulate the Jetpack <code>[contact-form]</code> shortcode to prepend the Google script, add a button, and parse the response.
This plugin allows both reCAPTCHA v2 and invisible reCAPTCHA (see screenshots and choose whatever works for you!).
Shoot me a question about it on Twitter: <a href="https://www.twitter.com/bozdoz/" rel="nofollow ugc">@bozdoz</a>.
This plugin is open source on <a href="https://github.com/bozdoz/wp-plugin-recaptcha-jetpack" rel="nofollow ugc">GitHub</a>!

reCAPTCHA Jetpack

A simple plugin that adds a Google reCAPTCHA to the Jetpack contact form. Requires the Jetpack plugin.

Contact Form 7 BWP reCAPTCHA Extension vs reCAPTCHA Jetpack