This compiler doesn't require internet connection to use, allows you to save the code you typed in a C file in your phone storage, and doesn't lag very much (unless the code you typed is like 200 lines long). The problem is, if you use scanf(), then use getch(), then the getch() doesn't work (but you can just put a 2nd getch() after the 1st one as the 2nd one will work perfectly fine). Overall EXCELLENT FOR BEGINNERS.