What are the available data sharing scheme between two iPhone apps?

Question

Aside from using URL scheme, what other means are there for two iPhone apps to pass data between each other (ideally, without launching another app -- which is one of the downsides using URL scheme)

Answer 1

Unfortunately apps are sandboxed, and can't communicate with each other. You would have to implement something server-side to act as a central location for this data.

Answer 2

See thread: http://stackoverflow.com/questions/220630/how-to-share-custom-data-between-iphone-applications

Answer 3

Then check out: http://infinite-labs.net/swapkit/