Hmmm… I think both the toolbars from your screenshot might actually be the same size, but the iPad one is overlapping with the device status bar. You can see the blue icon on the right is overlapping. By the way, that overlapping behaviour shouldn’t happen. Does it still happen if you remove the icon and just have a text in the toolbar? I’m guessing that the problem is because the icon height is larger than the toolbar height and the toolbar is not automatically resizing. From the OnsenUI source code, it looks like the height is set to 46px. It should be possible to override this by applying your own CSS class to the toolbar.