Careful with conclusions. These graphs have been carefully prepared.

Notice how:

1. Paid apps and free apps are lumped together, you can't really see the difference in paid apps clearly. This is important from a developer standpoint — only paid apps will pay your salary.

2. iPhone OS is split into two platforms, while all Android devices are lumped together. Huh?

3. Everything is on a per-user basis. This is fine, but those are not the numbers you should be looking at if you are a developer (as most of us on Hacker News are). You want the aggregate market size. You want to plan your revenues. You don't want per-user statistics.