As well as what we would deem to be the ‘fun stuff’, the SDK has also opened the door for some extremely practical applications to be created. The Converter is one such entry from sole developer Vladimir Kofman. As the name suggests, this is a conversion tool. It comes with 900 units spread across 26 categories. There are also two modes: one for simple converting and one that’s more complex, which allows all possible unit conversions to be shown on a single page. On top of all of this there is a fun element, which allows you to tilt and shake your iPhone to allow random things to happen. And for the small fee of 59p, it’s worth having just in case you need it. The interface is well designed and easy to use. Of course, metric to imperial conversions are very useful, but perhaps the most essential part of this app is the currency converter. Other highlights include the clothing converter, as well as fuel consumption for those of you worried about your carbon footprint. A great idea that’s well executed in this cool app.