Apple aims to allow developers to release universal apps that work across iPhone, iPad, and Mac as early as next year, according to Bloomberg News.

Starting as early as next year, software developers will be able to design a single application that works with a touchscreen or mouse and trackpad depending on whether it’s running on the iPhone and iPad operating system or on Mac hardware, according to people familiar with the matter.
Apple currently plans to begin rolling out the change in iOS 12 and macOS 10.14 next year, and it could announce the news as soon as WWDC 2018 in June, according to the report. The exact timeline is subject to change.

Apple currently requires developers to design separate apps for iOS and macOS, but Mac apps often receive less attention than their iPhone and iPad counterparts. It's unclear, however, if Apple will go one step further and merge the iOS and Mac App Stores, according to the report.

The project is reportedly codenamed "Marzipan" and is considered to be one of the biggest changes on Apple's roadmap next year. The report speculates that universal apps would make it easier for Apple to one day create a single operating system for all of its devices, should it ever go down that avenue.
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