Apple is working on new conventions where a developer can develop an app once and have it automatically run on iPhone, iPad, and Mac without any extra work. The initiative is called ‘Marzipan.’

https://www.pcmag.com/news/366636/report-iphone-ipad-mac-to-run-the-same-apps-by-2021

App developers targeting Apple’s platforms currently need to create at least two versions of their apps. One is aimed at iOS while the other at macOS. However, by 2021 this may no longer be the case as Apple is thought to be aiming for a “one app fits all” solution.

As Bloomberg reports, Apple is planning a multistep initiative which is being called “Marzipan.” Expected to be in place by 2021, it would allow a developer to focus on creating one version of their app targeted at Apple’s platforms. Deploying it to iPhone, iPad, and Mac devices would be handled automatically by the Marzipan system, which would take the form of a software development kit (SDK) provided by Apple.

The thinking is, by removing the need to create multiple versions of the same app, developers will be encouraged to release across all three platforms. Apple benefits because it gets a wider choice of apps across both its portable and desktop hardware, which in turn should bring a boost in app revenue. It should also boost hardware sales if that hardware can do more through more apps being available.