The report also covers Android (96% of iPhone app) and Windows 8 (54%), offering a broad picture of app availability across the three leading smartphone ecosystems. There is also some discussion of areas that are currently considered to be at the heart of the app gap debate (News Outlet apps, Google Apps, Bank apps, Streaming Video apps), with a suggestion that the situation is slowly improving.
Image Source: Infragistics
The report's author, Nick Landry, suggests Windows Phone's performance is "not bad at all considering the global market share still hovers around 4-6%", adding that "Android had to reach a much higher market share before official brands started developing for the platform".
He goes on to note that if you look at apps that if you take the apps that are on "Windows 8 but not on Windows Phone" and add them to apps known to be coming to Windows Phone soon (Flipboard, Vine, Mint.com, Path), the total number of the top 100 iPhone apps available on Windows Phone would reach 79. The first assertion does leave room for debate, but Landry is quite right to point out that developers who have created a Windows 8 app may be "open to the idea of supporting Microsoft’s mobile platforms but they might not have gotten to it yet".
Despite this, it is clear that Windows Phone does still have an app to close, something that is unlikely to change as long as it is the third third place ecosystem. However, rather than saying Windows Phone "doesn't have enough apps", it might be better to say "doesn't have the right app(s) for me". The difference may seem subtle, but the second statement implies that Windows Phone should be considered and assessed for app availability, rather than being rejected out of hand.
There's a lot more detail in the full report, which is available on the Infragistics website.