Windows Phone might have over 160,000 apps, but there are still some big names missing. Microsoft has tried to bridge the app gap between iOS / Android and Windows Phone, but much of the innovation is coming from developers who are creating unofficial third-party Windows Phone versions of the most popular apps. There's a YouTube replacement in the form of MetroTube, a Snapchat variant, an unofficial Vine app, and even several Instagram clients.

The apps work and connect up to these popular services just like their iOS and Android counterparts, but without official support they often break following updates to the genuine versions. As an end user, you also have to pay for them or put up with ads, whereas the official versions on rival platforms are usually free. These apps are championed by Windows Phone fans as genuine replacements for the real article, but the developers behind them face just as many risks as rewards.