What no one (few?) are mentioning is that the geofence mechanisms on phone is not reliable enough to do time tracking like this. For power reasons it might be s

What no one (few?) are mentioning is that the geofence mechanisms on phone is not reliable enough to do time tracking like this. For power reasons it might be seldom activated or woken up.. could many many minutes after arrival or departure, and that's assuming that the bounds weren't tight enough that it requires a higher-accuracy GPS mode which might take even longer to get that data (since it's opportunistic on other location requests). It would help if the employees used a mapping application to get directions to work, as then high-accuracy location would be on and triggered, but that's not obvious to ordinary people... and not likely to be used on your usual routes either. In this respect the app is kind of selling snake oil with high consequences. Employers would be far better off with the clock in/out that has existed forever.