RockPOS can work on:
but PC and laptop are the best options. On tablet/mobile/iPad, some functions are limited like: scan barcodes, print by QZTray,... as well as the screen resolution is not good to display full elements in RockPOS.
To assist customers to experience RockPOS on their sites before purchasing, we release a version for a 14-day free trial. Download at http://rockpos.com/free-trial.