The average iPhone app sells 25,000 units
At the IBC legal conference I attended last week, I received some interesting iPhone download statistics.
The key point was that even as the number of iPhone applications has proliferated to 75,000, and over 1.8 billion apps have been downloaded, the average number of downloads per app has remained remarkably constant at around 25,000. The charts below show the story (click to see them at full size).
Number of iPhone applications and downloads
The average doesn’t tell the whole story. It’s a mean, which assumes that downloads are evenly distributed. It is much more likely that some applications have a million downloads and some have almost none. A median would be more useful, but I don’t have the data for that.
Nevertheless, the trend line shows that despite the proliferation of titles on the AppStore, the average app has, consistently, had 25,000 downloads.
Which should give heart to aspiring iPhone developers the world over.
Luke Halliwell on October 7, 2009 @ 4:34 am
Of course, the median is really far more important to “the average” developer, so it would be interesting to see that. As a quick thought experiment, I tried plugging in these numbers to the “Zipf Law” (downloads inversely proportional to rank) – which is commonly observed in “long tail” situations, and that suggests the median would be about 4000 downloads.
Would be good to know the true figure though
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Nicholas Lovell on October 7, 2009 @ 9:38 am
That's a really interesting analysis. I hadn't heard of the Zipf Law before. Where exactly do you “plug the numbers in”?
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Luke Halliwell on October 7, 2009 @ 12:47 pm
Um, I just did it with these 2 lines of Python
total = sum([(1.0 / r) for r in range(1, 25000)])
print 1800000000 * (1.0 / 37500) / total
I'm sure there must be some statistical software that lets non-programmers look at distributions, but I don't know of it. It's probably possible in Excel somehow too.
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WireBear on October 29, 2009 @ 8:55 am
Good Article! It would also be interesting to find out how the “average” paid app does in sales.
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WireBear on October 29, 2009 @ 3:55 pm
Good Article! It would also be interesting to find out how the “average” paid app does in sales.
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Julio Medina on January 26, 2010 @ 2:51 am
I like this info…
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micha on March 25, 2010 @ 4:17 pm
thanks Luke, small update if you plug in new numbers from wikipedia you get (end of march 2010)
f(75,000,1,150,000)=3*10^9(1/75,000)/12.495 = ~3200 median download
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micha on March 25, 2010 @ 4:19 pm
using
f(k;s,N)=frac{1/k^s}{sum_{n=1}^N (1/n^s)}.
as formula
where k is rank, s=1 (exponent of inverse relation), N=total num of applications
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