For devout online shoppers, here's an app guaranteed to make you just as excited as a free shipping offer: Slice, a digital tool to keep track of everything you buy online. Instead of playing the inevitable game of signature tag with the delivery person or anxiously waiting at your front door, Slice does the work and automatically tracks shipments from multiple stores to let you know when to expect each package. Even better, the app also organizes and saves receipts — that way, if a purchase doesn't work out, refunds are easy.After tracking and organizing your purchases, Slice works as a budget guide, using graphs to show the amount of money spent online and on what type of goods. The only thing the app can't do in your shopping routine? Pick purchases for you — that'll have to wait until the robots take over.