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Surprising that IOS shipped before Android given the higher market penetration of Android in developing countries coupled with Khan Academy's mission.

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Simply because the overall time to develop and ship on iOS is quite less than android. KA can learn a lot from shipping and iterating faster. And I am sure the Android version is likely under development and will be out soon.

Eeeeh, iterating on Android can be much faster than iOS. No week-long review wait. Of course, if your iterations are significantly longer than a week, it really doesn't matter.

Iteration doesn't really happen daily or weekly. It's about gathering enough data and the making changes on monthly bases maybe. In my experience I learnt that it's easier and faster to build an iphone app (no fragmentations, no jelly beans or ice cream sandwiches) and show it to a large user base, iterate over it and then work on android.

So far I've found iterating on Android faster. It's also ridiculously easier to do large betas because you don't have to do the iOS provisioning song & dance and deal with a 100 device limit.

I suppose it depends on the kind of app you're writing but I haven't spent much time on fragmentation issues and get reasonable UIs on 7" tablets almost for free.

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