the whole basic idea of the app is extremely basic. you combine freely available road-data with freely available crime data, and build some sort of interactive thing that users can pin-point their own crimes as well (which nobody will do).
first of all, you need to be a ridiculous crime-nut if you plan your routes based on where once every few months a crime takes place. obviously, the chance of getting hit on the road by another car is infinitely bigger.
second of all, anyone with basic IT-skills could create this app.
it's worth like a 100 bucks at most. no idea why I bother, you know that, I know that.