That sounds like my kind of project (no UI to worry about) but I've never used QML and am struggling to think how prediction works. Do you suggest the alphabetically next matching word that's slightly longer or a much longer word to save more typing less often? I guess there's a big dictionary behind it for each language, but they are full of words few will ever use on a phone...

As a Colemack user on my Sailfish devices I would want different corrections to a qwerty user too, assuming spellcheck and prediction are both part of the same thing.