# Any editor as convenient as that of stackexchange Physics

Stackexchange physics has a very nice real-time editor of latex form formula.
Writing notes in this editor apparently is more efficient than using a normal latex editor. Is there any similar project online or as a software which allow me to save edition and write in A4 size pages ? As writing notes, the full feature of latex is not that important.

• Welcome to TeX.SX! Please specify what you mean with "save edition". – TeXnician Feb 9 '17 at 18:17
• I mean as I type in the stackexchange editor, By clicking, I can only post it. I cannot even save it as a draft. Anyway, I can copy the text to a local text editor then save it. – YuchiHe Feb 9 '17 at 18:24