Originally Posted by murraypaul
You probably wouldn't see it now, as Android tablets are so mainstream, and the OS has been updated to merge the phone and tablet interfaces, but it was certainly the case when I first got my Nook Color, when Android was very much still a phone OS running on tablets. Just as there were lots of iPhone-only apps when the iPad was first released, but they are uncommon now. The point being that it isn't an Android thing or an iOS thing, both OSs allow developers to produce apps that run at different screen sizes and aspect ratios, but it is up to the developers to actually code that support.
Androminium was one I remember, it just got a proper tablet UI update last month.
Well, it should be remembered that those early tablets were released before Google announced a version of Android for tablets. Those same apps, even if they hadn't been updated, mostly scaled up properly when run on Android v3 or later (although a lot insisted on being run with the tablet held in portrait). You didn't need a proper tablet UI to be written just to take advantage of the full size of the screen.