5. Grocery Gadget

Grocery Gadget may seem a bit pricy at $4.99, but it has a range of features that puts all the other apps to shame. Coupon integration means you can get the best deals wherever you are, while the app learns the layout of the shop you're in. With the web portal, too, this is a well-designed app for iPhone and Android users as well as Windows Phones, Blackberrys, and Nokias.