This app was mentioned in 3 comments, with an average of 1.00 upvote
On of the best apps I used is draft punk. This year it's been updated to sort players in teirs, % of availability and risk. You can also do movk drafts, and live drafts with customized settings. It cost 2 dollars to upgrade to the pro version which gives you depth charts.
Check out "Draft Punk - Fantasy Football" https://play.google.com/store/apps/details?id=com.joshclemm.android.draftpunk
Here's the Play Store link. It uses FantasyFootballNerd rankings. I've used it for all my leagues the past couple years and have been really happy with it. Makes it really easy to follow along with the draft as you just swipe away picks as they go. You can see your time and everyone else's as well. It is simple, looks nice, and I haven't had any issues with the players it suggests.
Most of the guys at our draft were using Draft Punk, but Clickydraft and Jay's Draft Aid are really nice, too.