There are many online writing software but if you are looking for one with fast sync across several computers and mobile devices, Simplenote is the answer because it has a top-notch performance in terms of speed and reliability of text synchronization.

Simplenote is available as web-based software and apps for iPhone and iPad and Android devices and also for Mac. It does not support folders but can add tags to documents for searching and organizing. Simplenote also syncs with other popular software like Scrivener for Mac, Notational Velocity, and Dropbox.

For good reviews of Simplenote, check the following links.

3. The best lightweight notes app in 2013 is Simplenote by DJ Chuang

2. “The first thing I notice when I open Simplenote is how blazingly fast it is.”  Review of Simplenote for IOS 7  by Chris Gonzales

1. “Simplenote would create a version for every key you typed, since the system is checking for updates every 200 milliseconds.” Review by Ellis Hamburger