I keep those apps in my phone just in case I need a quick bite to eat. Usually save me money. McDonalds, BK, Red Robin, Ihop, Applebees.
Burger King has probably the best deals overall. McDonalds isn't bad, for instance they have two cheesburgers for 1$ today. I don't eat that food very often though. My petite waist line objects. Ok...it's petite for an elephant.