Slice is for the online shopper who likes to have everything right at his or her fingertips. If you take the time to set it up, the app will quickly become the central hub for your online purchases. You can organize your online receipts, track packages and even monitor recent purchases for price drops so you can request a price match refund. The key to Slice's success is your email account. Grant Slice access to your account, it will scan your emails for order invoices and shipping notices.