udidol

The Add Chat App Button plugin enables adding a customizable click-to-chat WhatsApp button. 
The plugin lets you choose between a simple WhatsApp icon and a rectangle with a custom text label (see screenshots).
<h3>Usage</h3>
To enable the WhatsApp button, check the first checkbox in the settings page. You will find the settings page in the admin dashboard menu, under Settings->Add Chat App Button.
You must enter an international phone number (only numbers, NO plus sign (+), NO dashes(-)) in order to enable the WhatsApp button. Even if you manage to save settings into the database without entering a phone number, your button might not work properly.
The plugin settings page has two tabs: “General Settings” and “Button Design”.
The General Settings tab includes options such as limiting the button to only display under a certain screen resolution (in pixels), attaching a default message that will be populated in the user’s phone when they click the button, and more.
The Button Design tab includes controls for the button color, label text color, button type (side-bearing rectangle, WhatsApp icon, fixed-bottom button), and more. The Button Design tab also includes a smartphone mockup with a live preview screen, enabling you to see a real-time (estimated) rendering of how your button would look, on the fly, as you are changing its design.
The plugin detects whether the site visitor is using a desktop or mobile device and serves a different link for each accordingly.

Add Chat App Button

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Add Chat App Button enables adding a customizeable click-to-chat button that opens a chat on WhatsApp. This plugin is not affiliated with WhatsApp or  …

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.

Add Chat App Button vs WP Sticky Button – Click to Chat