Missing a few features

Was looking for an iPad app to track my bonds since I rarely use my laptop anymore and the Treasurys bond tracker. To make the app ideal it needs to also have a box to mark as cashed, if the bond has matured (so I dont have to calculate in my head) and like other users mentioned a total interest calculation. A free version has the other options, except for cashed check box, but the the competitors doesnt have the pass code feature which when dealing with entering bond serial numbers I want security.

Bondtracker about Savings Bond Calculator