4. idealo price comparison
These days, with so many online retailers, you can spend ages trawling the web to find the best deal. This app aims to put an end to all that. You type in what you're looking for - or better still, scan a barcode if you're our shopping and want to know if you can get something cheaper online - and it will search 14,000 online shops, including the likes of Amazon, Tesco Direct, Play.com, Argos and Debenhams, for the best deal. It will give you detailed product info and expert and user reviews too. The list of retailers isn't yet exhaustive but it's pretty good and very useful for saving on your pressies at Christmas time.