Mobile application development cannot be reliably estimated from screen count alone. Business rules, user sign-in, payments, administration, offline use and integrations affect the scope. A simple interface may hide a complex approval or synchronization process. In the quote, we therefore separate features and dependencies instead of promising the same deadline for every project.
For a useful estimate, send a short description of the problem, main roles, three key features and existing systems. Add examples of applications you like and explain why. If you have a target launch date, explain the reason for it too. We can then suggest what to do first and what can move to a later phase.