It all depends on the type of application you need and what should be calculated in each case. For these questions, I advise you to contact these guys https://surf.dev/flutter-app-development-cost/ , they will calculate the flutter app development cost. When I created my Messenger, I worked with them, and they helped me to reduce the cost of the application and made everything very well. If I will ever need help with something like this again, I will definitely go to them and I will advise you!

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