Hey,

we've been mining ourselves for quite some time, one of the main problems we always had was the huge spread of sell prices across all the exchanges
So at some point we wrote a little console tool that compares the prices of all major exchanges including fees and tells us where to sell for the highest profit.

We realized that if it's a helpful tool for us, other people would probably find it useful too - so we rewrote the logic, slapped a sleek interface on it and here we are

TL;DR:
Huge spread across all exchanges for currencies, this app compares the realtime rates (including fees) and tells you where to sell to get the most out of your mining efforts

https://play.google.com/store/apps/details?id=com.tdnc.cryptopal&hl=en