The app suggests random cards. I did a few drafts and would draft Boros/Grull but yet it would suggest that i pick the Dimir counter spell instead of a Boros charm or a Grull Guildmage. But it didnt just so it the once, it happened multiple times. ( and i was on the third pack, so it should have realized what i was drafting by then.) If you want something to kill time then buy it, but if you want to learn how to draft better then I would pass on this one.
Krederon about Draft Trainer, v1.1