There are few factors that affect the cost of app development. First of all, development of such mobile app on one platform can take up to 660 hours. You can count up the approximate price, on average it's about $40 per hour. You have to multiply the hourly payment of an IT-engineer by the time consumed.
Hello! If you want to create such app you need to implement some new idea because competition now is really high. With what platform do you want to start, iOS or Android? For second variant I can recommend good specialists in Java development https://mangosoft.tech/java-development/ as you can see they can provide a lot of different options for you.