iPad vs iPad apps

[PNGento]

Are apps for iPad also usable for iPhone or macs? Or, if I own all 3 products will I have to buy all 3 versions of the same software?

 

[MacDawg]

Many iPad apps are useable on the iPhone and vice versa
Check the requirements when you buy
Some apps have different versions for iPad and iPhone

None are useable on the Mac
Different OS
You must buy the Mac version if available

 

[GoCubsGo]

I believe you'd want to look for the + sign which I think indicates universal (for iPod, iPhone, and iPad).