CrestaProject

<a href="https://crestaproject.com/cresta-help-chat-demo-page/" rel="nofollow ugc">Plugin Demo</a> | <a href="https://crestaproject.com/downloads/cresta-help-chat/" rel="nofollow ugc">Plugin Homepage</a>
With Cresta Help Chat you can allow your users or customers to contact you via WhatsApp simply by clicking on a button. Users may contact you directly in private messages on your WhatsApp number and continue the conversation on WhatsApp web or WhatsApp application (from mobile). 
You can use the floating button which is positioned at the bottom right of the site or a button inside post or pages using the [cresta-help-chat text=”Need Help?” icon=”yes” position=”top”] shortcode. 
Cresta WhatsApp Chat is compatible with WooCommerce and WPML.
Some features
<ul>
<li>Add the button to open WhatsApp Chat at bottom right of your site</li>
<li>Use the shortcode [cresta-help-chat] to add the WhatsApp button in your posts, pages or custom post type</li>
<li>Choose which pages to show the WhatsApp Chat button</li>
<li>Mobile version: click the button and automatically open the WhatsApp App (if installed)</li>
<li>and more…</li>
</ul>
PRO version features
<ul>
<li>Change position of the box button</li>
<li>Change colors of the box button</li>
<li>Add tooltip on the box button</li>
<li>Change box size</li>
<li>WhatsApp widget</li>
<li>Different Animations</li>
<li>and much more…</li>
</ul>

Cresta Help Chat

Allow your users and customers to contact you via WhatsApp with a single click.

farazify

WP Sticky Button is a Free & Light Weight WordPress plugin that displays the beautiful WhatsApp Sticky Button on the WordPress frontend. 
After clicking on the WhatsApp Sticky Button, It will bring you to the WhatsApp application or WhatsApp website.
<ol>
<li>It will bring you to the WhatsApp application if WhatsApp application installed on your device</li>
<li>It will bring you to the WhatsApp website if WhatsApp application is not installed on your device</li>
</ol>
Admin Setting Panel
<ul>
<li>WhatsApp Sticky Button – Settings</li>
</ul>
<ol>
<li>Activate/Deactivate WhatsApp Sticky Button</li>
<li>Customize “Display on” functionality for the Mobile, Tablet & Desktop Devices</li>
<li>Change the Position of WhatsApp Sticky Button to Top-Left/Top-Right/Bottom-Left/Bottom-Right</li>
<li>Add WhatsApp Number</li>
<li>Add WhatsApp Default Message</li>
<li>Customize Icon Width</li>
<li>Customize Icon Height</li>
<li>Customize Icon Margin</li>
<li>Change Icon Type to Default WhatsApp Icon/Custom Icon Image</li>
<li>Select Custom Icon</li>
<li>Save & Enjoy!!!</li>
</ol>

WP Sticky Button – Click to Chat

Display the beautiful WhatsApp Sticky Button on the WordPress frontend.

Cresta Help Chat vs WP Sticky Button – Click to Chat