Thanks for your informative reply! 1. I was thinking there may be other avenues. Perhaps licensing? However I believe this would mean lawyers would be needed

Thanks for your informative reply! 1. I was thinking there may be other avenues. Perhaps licensing? However I believe this would mean lawyers would be needed to draft up the license and ultimately would cost much more in time and effort. Also not sure if this is an attractive option. 2. I have written some libraries which I use in other apps - mainly the backend, asynchronous networking code. I would like to use this in other apps I develop in the future. I suppose this would mean a clause would have to be introduced into the contract? 3. Makes sense. 4. Yes this is the kind of ambiguous answer I didn't want but knew I would get! :) I find it extremely hard to determine the value of this app to them and this is the question causing me the most stress. They have told me they wish to distribute it for free on the App Store and that the benefit for them is the large value-add for their clients. A director also dropped a figure in casual conversation with me and mentioned that I may be able to ask for higher than that. But where did he come up with that figure and how does he know I can go higher, and how do I know how high I can go? 5. What is the difference between my company producing for them as a client, and my company being contracted by them? Or do you mean, do not become a contractor as an individual, but rather deal with them through my company? 6. Yes they seemed to like me charging per feature. A contractual agreement seems to be the way to go.