We often talk about the iOS-Android duopoly, but - even ignoring Windows Phone - where does that leave Amazon's own take on Android?
Of course, the problem is that, with no official figures on how many Kindle Fire devices are being used (maybe 10 million), it's hard for developers and publishers to make the decision to support the platform.
Even when it comes to the biggest brands on the planet - as defined by the 2013 edition of Interbrand Best Global Brands report - there's a big difference between the App Store and Google Play, and the Amazon Appstore.
Only 8 of Interbrands' top 100 don't have at least one app on iOS, while on Google Play the figure missing is 25 percent.
When it comes to Amazon, however, only 28 percent of the top 100 brand have one app on the store.
That doesn't mean that everyone is ignoring the platform though.
House of the Mouse
With the vast majority of users thought to be in North America - Amazon is a very US-centric company - some of the US big brands are making use of the lack to competition to stamp down their authority.
As demonstrated in Distimo's third annual report on brands in the app ecosystem, it points out that in October Disney had six of the top 10 most downloaded apps from the Amazon Appstore.
Partly this is a consequence of the recent release of Where's My Water 2? - the most downloaded Amazon app in October.
But other games such as Where's My Mickey/Perry? and TV app Watch Disney Channel also underline Disney's reach across its different brands and channels.
In fact, Disney has 23 apps available on Amazon; although this is much less than 54 it has on Google Play, and the 251 it has on iOS.
[source: Distimo]