Do you want that exchanger to be widely known or for just a small amount of people. I think for wide audience, you need a lot of money because of so much and popular exchanger exist here.
On exchanger all I am looking for is low fees, optimized website, high speed connection and good support + many coins exchange.
Would you be glad to have all of this features handy IOs/Android?
Do you have example of app the app you are running on daily basis?
What fees may suit you, exactly?
Be honest my friend)