What makes your app expensive?
There's no honest answer to "how much does an app cost" without a conversation. What you can work out is where the effort lies. Choose below what your app needs to do, and see how much each part weighs. That way you can read quotes and cut back in a targeted way.
Why no amounts are shown here
A price without a conversation is a shot in the dark, and it will mislead you as soon as you compare quotes side by side. What you can know is which part weighs three times as much as another. That is the information you need to steer.
How to hold this up against a quote
Go through your profile against the line items in the quote. If a heavy component is missing, it will come back later as extra work, so ask about it. If a large line item covers something that weighs lightly in your profile, ask why. Two conversations about the heavy components are worth more than ten about the light ones.