This app was mentioned in 3 comments, with an average of 2.33 upvotes
https://play.google.com/store/apps/details?id=com.dota2.easypick
I never used it but it exists apparently. I don't know how to counterpick against carries either... if there's PA/Slark/Troll/Weaver then the game usually ends before it even starts.
https://play.google.com/store/apps/details?id=com.dota2.easypick this is what I use on my Android.