Question about apps

[macigo]

So, how does the App Store know which version will download to a device?

Let's say you're upgrading from the 4s to the 5s, well, what about your apps?

How does the app know to add in the enhanced features? Why doesn't the app show up 3.5 inches?

 

[junkster]

The App Store doesn't know.

For most apps, all of the functionality to support different phone features is right there in the same version of the application. It detects the screen size and adjusts accordingly, for example. If you use iTunes to download an app, you can copy the same exact file to both an iPhone 4 and iPhone 5S and see for yourself.

 

[Mrbobb]

This will take a developer to answer, but when 64 bits Apps become available, Apple may have to maintain 2 versions, am guessing.

 

[DJJAZZYJET]

Apps are designed universally, so the same app will work on the 4s screen and the 5s's screen. If the app is really old an hasn't been updated to support the new 4 inch screen, then the 4 inch screen will render the content in the centre, and put two black bards on the top and bottom.