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The app replaces a paper checklist and digital camera with software.
Around a year ago, it boasted of 100 million "activated" users – the number of people who have ever used its app – and hasn't updated that figure since.
So, to get a better idea of what it takes to create a winning urban app, we caught up with one of the co-founders of Colab, Bruno Aracaty... When, and how, did you first have the idea for the Colab app?
A good app does something unexpected – or expected, but for some reason nobody has done it before.
Related: As Apple Watch launches, smartwatch app makers explore new interfaces Libin has owned his Apple Watch for three weeks at the time he meets the Guardian, and says he's finally figured out exactly what it's for, and just as importantly, what it's not for.
Since launch the free app has clocked up over a million users around the world.
Nokia has made its maps and satnav app available in beta form for free.
These are all welcome releases if you're a heavy Microsoft Office user though: new Android smartphone versions of each tool's existing tablet app.
Wildlife Trusts' Nature Finder (Free) Now something for people travelling around the UK in search of the local fauna: an app from the Wildlife Trust with maps and lists of its nature reserves and events – more than 2,000 places and 10,000 events a year – to help you explore the countryside.
It reflected the continued surge in popularity of smartphones and tablets, with a total of 30m downloads of the BBC's iPlayer app since its launch including 150,000 on Christmas Day.
