You can't save the file on external memory card on some devices (like mine), and the bigger the canvas size, the slower you got if you have more layers, maximum pixels is 4000 something (the Medibang mobile is 20.000px max), and it's instantly record your drawing time (but won't record the cancel and stuff you do while drawing), so it's heavier if you ask me, but the program and the feature is very good, at some point I consider it was better than Medibang, but because it's lagged more here, I seldom use it actually.