Closing music courtesy of Bellevue Presbyterian Church.Finally Ecotoll — Pay tolls in the USThe only app I found that claims to work in the listed 21 States (look for the state you will travel in). Another feature of this app that you might appreciate is a “toll calculator” to pre-plan your trip to estimate or avoid toll costs. With a graphic display! Of course, like all these apps — it’s necessary to have the right iPhone in the car.There Is a convenience fee of 14/12% for each transaction.