Choose the bundle identifier for an iOS and Mac app

Question

Suppose that I have an app called A.

Bundle Identifiers must be unique across all Mac and iOS apps. This means that if I have the app A on the iOS App Store with the Bundle ID com.mycompany.a, I cannot create an app on the Mac App Store with the same Bundle ID com.mycompany.a.

Ok, said that, what is the best way to distinguish the Bundle IDs?

Some examples I can think of:

• com.mycompany.a_ios, com.mycompany.a_mac
• com.mycompany.ios.a, com.mycompany.mac.a

Are there others that come to mind? Which you used?

Answer 1

Rather a request for an opinion than a question I'd say, but com.mycompany.application.platform is what I'd use.

The reason would be to make it more and more granular towards the end, seeing the platform as a sub component of the actual application.

Answer 2

Apple now allows you to use a single bundle ID for Mac and iOS apps through Universal Purchase:

Universal Purchase for Mac Apps Now Available

The macOS version of your app can now be included in a universal purchase, allowing customers to enjoy your app and in‑app purchases across iOS, iPadOS, macOS, watchOS, and tvOS by purchasing only once. Get started by using a single bundle ID for your apps in Xcode and setting up your app record for universal purchase in App Store Connect.

https://developer.apple.com/news/?id=03232020b

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Offering Universal Purchase

Upload your apps to the app record using a single bundle ID. While the bundle ID must match the bundle ID you enter in App Store Connect, the apps can have different version numbers and build strings.

https://developer.apple.com/support/universal-purchase/