As you've already established, there isn't great precedent for success with IndieGoGo in raising money for apps. The money isn't actually free in that - as you say - there is a lot of work involved to successfully achieve a campaign goal.

A Company I advise just raised $25,000 as two young, first-time founders from a single investor with a little more than a web-based prototype of their mobile app. I think given that everything will cost time and energy, you're better advised to raise $25,000 to $100,000 from friends and family or potential angels. Yes, this will take your time, but the dilution shouldn't be *that* bad (5-10% dilution). You will hear no more than you will hear yes, but then you're planting the seed to come back when you raise your seed round with those investors.

Lastly, if you intend to charge for this app, or in-app services, there are ways to run your own "crowdfunding" type appeal but directly to customers. Basically asking people to prepay for early access to the product. It's often a good litmus test for product/market fit and, if the product has a broad appeal, could work to your advantage.

Happy to talk more of this through in a call with you.