Whistle on Tap contains in-app purchases. Please check the pricing plan as below: Soccer Coach-$0.99 Basketball Coach-$0.99 Football Coach-$0.99 Sports Pack-$1.99 Premium-$3.99 Soccer Referee-$0.99 Alien-$0.99 Style Pack-$1.99 Cyber Punk Girl-$0.99 Bucky-$0.99