What I mean is that vim is a program that runs on your pc. Of course you can ssh to it from anywhere if you wish, but it seems to be over complicated just to write a text from any point of the world.
http://stackoverflow.com/questions/3109847/is-there-any-onli...
That's from 4 years ago, and the latest answer from over a year ago; I wouldn't be surprised if the situation were better now.