IMHO the idea won't work. I don't see why someone would use the application - saying "I owe you one" doesn't sound particularly engaging , and the overall purpo

IMHO the idea won't work. I don't see why someone would use the application - saying "I owe you one" doesn't sound particularly engaging , and the overall purpose of the app still remains too cold and calculating. Even if people did use it, favors between friends don't work like transactions - that's why they're favors and not paid services. That said, I think you should still finish the app. Startups pivot a LOT, and you might stumble across an awesome idea once you start looking at feedback and trying to figure out what people really use the app for.