Looking for useful smartphone and tablet apps can be sweaty work. While there are some amazing building and renovating tools available, the useful stuff's often hard to find. In most cases it's obscured by many thousands of underwhelming get-rich-quick efforts, half-hearted imitations and cheaply respun catalogues or web apps that have been slapped together because a heavily-coiffed marketing department somewhere is afraid of falling off the iBandwagon.
Thankfully though, there are some real gems available - and the right apps can be a huge help in certain circumstances. We've grouped a few of our favourites together below, based on what they do and when they might come in useful.