noun
Refers specifically to Apple's App Store for iOS/iPadOS applications. A product name; use アプリストア for generic app stores.
新しいアプリをアップストアからダウンロードした。
I downloaded a new app from the App Store.
Generic term for any app store (e.g., Google Play). アップストア is the proper noun for Apple's store.
Borrowed from English 'App Store', a trademark of Apple Inc.