Are you worried about being charged more than what your app might actually take to build by developers? All estimates are approximate but should give you a rough idea of what it will take to build your app.
I take into account many factors while making the estimation like :
How big is your app?
What level of UI would you like?
How many Users & Accounts you want to support?
What and how much User Generated Content does it contain?
Integration of Dates & Locations systems.
Does it contain modules for billing & eCommerce?
...and many more...
We will have multiple sessions and discussions on various topics
Cost Effective Solutions
Hybrid App V/S Native App V/S Cross Platform App
3rd Party toolset Dependancies
Just drop a message and I will be there to save you your hard earned bucks !!!