App flutter for bike runners

The idea is to create an exclusively cycling app that allows the user to register via Google, Facebook or Email. Also upload your profile picture.

The user will choose predefined routes or make their own route and share it with other users, also save routes as favorites. I think that for the predefined routes we could use a service like https://www.alltrails.com

The app is something like https://www.wikiloc.com/ but only with cyclism

Please tell me how much the cost could be.

Thank you.