Pixle studio has created two useful and uncomplicated tools for mobile developers that allow you to determine the optimal ratio of the screen with a picture on it without the presence of the device itself.
These tools are paper drawing templates.
The first “invention” is a set of blanks for drawing sketches of interfaces called Outline. It contains 28 PDF files for seven mobile devices: Android, BlackBerry, iOS (iPad and iPhone), Meego, Symbian, webOS, Windows Phone 7.
The second tool is the Tapsize template for sizing taking into account the resolution and the actual size of the device.
Both templates can be easily printed on paper by pre-downloading them here
