What are you currently using to track conversions? Google Analytics? There are a number of ways to accomplish what you are speaking about and it will depend on how robust of a solution you desire and also what your sales cycle looks like. One simple solution is to use the Google Analytics "Mult...
I'm not usually big on crowdfunding, but this is the sort of thing that it was created for. I would think that if you made your pitch compelling you'd be able to raise a fair amount that way. I would also suggest that you really pear down your app so as minimize expenses. Use only one developer,...