The application you're describing is probably useful, and can probably be sold... but that's not the question :)

The question is what it will cost you to acquire a new customer, and what you can charge that customer.

Before actually BUILDING this thing, see if you can get 10 potential customers to at least SAY they're interested. In exchange for their feedback during the development process, offer them free use of the product until it's released, and then for a year thereafter. If you can't close that sale, then either you or your product has a problem.

If you CAN get a handful of customers to agree to this "free participation as a development partner" arrangement, then move on to step two: get yourself a HUNDRED signed up. This is a larger number than you can pursue manually, which means you'll have to develop your sales pitch as a landing page on a website, figure out what language will be effective, decide where to advertise, and so forth.

Again, if you accomplish this, then you're very well along the way to making this project feasible. But if any part of the above seems impossible, or too expensive, or too confusing or scary, then don't bother wasting your time creating the system.

In other words, I'm saying you need to test whether you're capable of building a marketing engine to support the sales of this concept. I *assume* you're capable of creating the underlying product, but that's far from the only challenge.

I hope the above was helpful, and of course do feel free to look me up for a call if you'd like to discuss further.