Windows Phone 7 isn't compatible - or not very much.
An Android version of Fitaly to run on Samsung Galaxy Tab would improve the odds of my buying both. It does have the interesting Swype, but I think it isn't for me. And there was supposed to be that speech recognition app.
Did I discover before that MessagEase is now on Android and iPhone, as well as several other platforms? It says "new" for Android. My experience of trying it out, though, a long time ago - or maybe only comparing to Fitaly use - is that its system (as I recall) where many common letters are strokes instead of taps (which the -most- common letters are), is tiring: like writing in Fitaly all-caps by stroking each letter. That gets dull very fast. And then it gets sore.