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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  …

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.

Add Chat App Button vs Cresta Help Chat