I have been through a number of package tracking apps for the iPhone. Some where accessible but you had to use copy/paste or manually enter the tracking information. Last week I came across one called shiprack. You forward emails to firstname.lastname@example.org and it takes care of the rest. You authenticate with gmail or facebook accounts, then you can add aditional aliases, IE sendero account or other personal accounts. The app is accessible both on Android Jelly Bean and IOS. within the last week started supporting IOS. I have tried a number of these tracking packages where you forward the tracking information but the app was never accessible. This one is.