[indralukmana]

sounds like a very nice application, i see there are some pricing models (personal, pro, and teaching) which i think is excellent if i am using latex.

but is there a free (limited) plan for someone like me who still trying to learn latex.

[jdleesmiller]

Yes, you can sign up for free (https://www.writelatex.com/signup), and there's a lot you can do with a free account.