I haven't used any of these apps, but being that I live in a high-density area (Hoboken) I know very well how useless this kind of an app would be. Parking in H

I haven't used any of these apps, but being that I live in a high-density area (Hoboken) I know very well how useless this kind of an app would be. Parking in Hoboken (and NYC) consists of the following - circling. Even if you had a realtime stream of all of the metered spots and each meter had some means of determining if it was available or taken, the demand almost always outweighs the supply, so when you really needed this app to work is exactly when it would let you down. Particular to these apps, do they have an expiration on these spots that are marked empty by the person leaving? After a few false positives I'd be inclined to throw the app away and rely on the circling technique and save the battery life on my phone.