Your app icon is one of the first elements of your app that users see, so it’s essential to make a strong first impression that communicates your app’s quality and purpose.
You’ll need to upload two icons: one for the App Store for iMessage, and one for the App Store for iPhone and iPad. The file you upload for the App Store for iMessage is a rectangular version of your icon at 1024 x 768 pixels. The icon file you upload for the App Store for iPhone and iPad is 1024px by 1024px.
While these images are large for scaling purposes, your icon is usually seen at small sizes. Make sure that the images gracefully scale down to smaller sizes. The system will resize your icon and apply an oval mask for the App Store for iMessage. Do not upload an oval icon. Keep the design simple and note that elements on the outer edges will be obscured by the oval mask. If your icon is designed with a white or light background, a hairline stroke will be added for display on the App Store.
Before uploading your icon in App Store Connect, get details on designing icons for the App Store for iMessage from the iOS Human Interface Guidelines: iMessage Apps and Stickers.
App Name and Description
You can use the terms iMessage and Stickers in your app name and description. If you use these terms, don’t repeat them in your keyword field, and vice versa. For more information on writing effective product page metadata, read the App Store Product Page.
Keywords are limited to 100 characters total, with words separated by commas and no spaces. You can use the terms iMessage and Stickers in your keywords. If you use a term in your keyword field, don’t repeat it in your app name, and vice versa. For information on writing effective keywords, read Optimizing for App Store Search.
Using the iMessage Name
iMessage should always be written in English, even when it appears within text of another language. Always write iMessage as one word with a lowercase “i” and an uppercase “M”.
For all iMessage apps and iOS extensions, provide separate sets of screenshots of your iMessage content for iPhone 6 Plus and iPad Pro. These screenshots will be used across device sizes. You can upload up to five screenshots per set to showcase the iMessage experience. You will need to upload your screenshots to both the App Preview and Screenshots section and the iMessage section of your app’s version page in My Apps on App Store Connect.
When showing conversations in Messages, make sure the information and accounts you display are not real. Do not display phone numbers. For screenshot specifications, see the App Store Connect Guide.
Your app preview footage demonstrates the features, functionality, and UI of your app. For iOS apps with iMessage or Sticker extensions, you can show both the iOS app experience and the iMessage app experience. Do not show the Home screen or the transition from the app to the extension. App previews are displayed on the App Store for iPhone and iPad and are not displayed on the App Store for iMessage. Learn more about app previews.
The App Store for iMessage shows apps browsable by primary categories. There is a new category called Stickers, which appears at the top of the category list on the App Store for iMessage. The Stickers category also contains Sticker subcategories. The Stickers category is only available to standalone Sticker Pack apps and iMessage apps. You can choose Stickers as a primary category and one Stickers subcategory.
Categories for your iOS apps with iMessage or Sticker extensions are taken from your iOS app and are used on the App Store for iPhone, iPad, and iMessage. iOS apps with iMessage or Sticker extensions can’t choose the Stickers category. For more information, read Choosing a Category.