Ghotit Real-Writer, is a very simple editor with most basic functions and big buttons. It includes text-to-speech and word-prediction, and corrects spelling, grammar and punctuation as in Ghotit for Windows.
System requirements are Mac OS X 10.5 and higher with Intel CPU. Spelling correction requires Internet connection.
Price for an annual single-computer licence is £99 or £17 per month.
See B.D.A. tech page Spell Checkers.
