Caution: Syncing can delete timed entries
If you have this app on multiple devices, be very careful about the order in which you sync them or it will delete your most recent timed entries. When I use the iOS app, I have to write down the start time and time of day. I learned this the hard way after losing timed entries. This issue has not been addressed by the developers, as it just happened to me again yesterday. After timing work on my iPad, I accidentally synced my desktop app first, and it erased the timed entries on my iPad. I do like the invoices, but the product is unreliable if you need to time your billable hours. It will not recognize your most recent entries by date and time, only the the order in which the apps are synced.
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Billings Pro - Time & Invoice