Comment by cliveowen

The fact that there isn't any app that does the same thing doesn't necessarily means that there's an opportunity, on the opposite, it likely means that there is no market for it. Yours it's a niche interest and the app would thus have a niche market, which means you won't make money out of it. If you're okay with it and money isn't what you're looking for, then by any means create your own app.