And Apple accounted for a whopping 99.4% share of those revenues.
More than $4.2 billion of revenues were generated by mobile applications in 2009, according to analyst firm Gartner's latest report.
The big winners? Apple and iPhone developers. Gartner estimates that the App Store accounted for a stunning 99.4% of those revenues.
The thinking runs thus: Apple did more than 2.5 billion downloads in 2009, according to Gartner's calculations. It thinks that every other mobile app store combined generated just 16 million.
This is paid downloads, so stores like GetJar - who will doubtless have something to say about the research later today - are presumably not included.
Meanwhile Nokia recently claimed it was doing more than one million downloads a day on Ovi Store - but that was for apps AND content (ringtones, wallpapers etc).
Gartner reckons that more than 4.5 billion apps will be downloaded this year across all platforms, generating $6.8 billion of sales. It predicts that this will climb to 21.6 billion downloads and $29.5 billion of revenues by 2013.
However, by that point, Gartner thinks that a quarter of mobile app revenues will come from advertising in free apps, rather than paid downloads.