David Barnard:

If we took a poll of all iOS users and asked for a list of the eleven absolutely essential, can’t live without apps I bet we’d end up with at least a thousand different types of apps. A doctor might include a medical imaging app, a musician would likely include a multi-track recorder or some other musical sketch pad, an artist would include an actual sketch pad app, a builder might list an estimating app, a freelancer a time-tracking and invoicing app, and so on.

The Eleventh App