Takashi Fujisaki

It is a WordPress plugin that generates iTunes affiliate links such as iPhone, iPad, Mac apps and music, movies etc.
It is very easy because you can search the application on the article creation screen and paste the Shortcode or HTML tag of the affiliate link (below Applink) .
Applink displays icons, titles, categories, prices, compatible devices, link buttons to stores, and so on.
Also, you can specify the number of screenshots and display it.
Please see the plugin page for details.
<a href="http://e-joint.jp/works/wp-applink/" rel="nofollow ugc">Plugin page</a>
iPhone, iPad, Macのアプリや音楽、映画などiTunes PHGのアフィリエイトリンクを生成するWordPressプラグインです｡
記事作成画面でアプリを検索し､選択したアプリのアフィリエイトリンク（以下Applink）のショートコードまたはHTMLタグをそのまま貼り付けることができますので､非常に簡単です｡
Applinkにはアイコン､タイトル､カテゴリー､価格､対応デバイス､ストアへのリンクボタンなどが表示されます｡
また､スクリーンショットの数も指定して表示させることができます｡
詳しくはプラグインページをご覧ください｡
<a href="http://e-joint.jp/works/wp-applink/" rel="nofollow ugc">プラグインページ</a>
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WP Applink

It is a WordPress plugin that generates iTunes PHG affiliate links such as iPhone, iPad, Mac apps and music, movies etc.

mattdeclaire

The plugin allows you to use an iOS app’s ID to import all the app’s related information into your posts. This includes using the app’s icon as the post’s featured image, importing all the screenshots into the gallery, and adding custom field information (app price, description, rating, release date, related urls, etc.).
You may find other plugins that allow you to create a <a href="https://codex.wordpress.org/Post_Types" rel="nofollow ugc">WordPress Custom Post Type</a> for apps. That would be useful if you wanted to store a list of apps and thier attributes. The advantages of that method include having a separate admin section for creating apps, and the ability to have an “app archive page”. But, it has the disadvantage of not showing up in your normal post feed. Custom Post Types are best used for special cases, not to replace posts.
This plugin simply adds to the standard post functionality. It’s best used when you simply want to write about an app, and have your post show up among the other posts on your site. If you want to have a special archive for your app-specific posts, it’s best to create a category.

iPosts

Import iOS app information into your posts, including icon and screenshots.

WP Applink vs iPosts