That's the thing. You shouldn't need special tools to let an app scale to a different screen size or aspect ratio. On Android, apps can, by design, scale well to any screen size, resolution, or aspect ratio. SpeedTest is literally the only app out of the hundreds that I've viewed or installed that doesn't do this.
I completely agree. But for Apple, you do. It's because they picked a stupid 3.5 inch layout that's special. You can't scale it up, it would cut off parts. That's why the whole app has to be rescaled. Completely stupid idea on Apple's part, now a lot of the apps use 3.5 inches instead of the full 4 inches on the display. It would have been fine if apple changed the width as well, but they didn't.