Lemon is a FREE iPhone/Android app that is geared toward personal tracking of finances and expenses on the go. You can scan in any receipts from your phone, and review detailed information about your purchases directly from the app or online. You can also link multiple phones to one account if you're tracking receipts for more than one person.
The service breaks down your receipts by the purchase price, tax rate and expense type. You can view a simple graph of your purchases by month from the webapp or your phone.
Click here to get it!