This plugin allows you to promote the app connected to the site, for mobile visitors depending on their OS. Also, here is a possibility to show any standalone application you want. It is packed with a bunch of settings that helps you to configure plugin behavior.
Feautures:
<ol>
<li>Display banner for IOS users with a link to the Appstore</li>
<li>Display banner for Android users with a link to the Google play</li>
<li>Customization</li>
</ol>
Settings^
<ul>
<li>Link to the app for both OS</li>
<li>Banner position</li>
<li>Hide on scroll option</li>
</ul>
Link to <a href="https://wordpress.org/app-banner" rel="ugc">WordPress</a>

App banner

Requires at least: 4.0 Tested up to: 4.8 Requires PHP: 5.6 Stable tag: 1.1 License: GPLv2 or later License URI: http://www.gnu.org/licenses/gpl-2.0.

maylamkeobong

This plugin help you search and insert android app info from Google Play Store to content very quickly.
Feature:
<ul>
<li>Search android app info from Google Play Store and insert to content</li>
<li>Change title and size before insert</li>
</ul>

Google Play Store App Search And Insert

This plugin help you search and insert android app info from Google Play Store to content very quickly.

App banner vs Google Play Store App Search And Insert