This app was mentioned in 1 comment, with an average of 2.00 upvotes
It doesn't mention MAX on the nflsundayticket.tv page.
Plus the android app has this in the description:
"A DIRECTV.com account and SUNDAY TICKET MAX subscription, or the purchase of NFLSUNDAYTICKET.TV streaming service, is required to watch live video."
Source: https://play.google.com/store/apps/details?id=com.directv.supercast&hl=en
I'm still not sure if it is worth it though.