Syncplicity's iOS app emerges just as Apple itself is getting into the cloud computing game with its forthcoming system that will give users 5GB of storage to access documents and media from multiple devices. Chung said that's not a problem--Syncplicity already offers users mobile access to their shared Google Docs, among other cloud-based services.

"We don't see them as a competitor," he said of Apple. "We see them as yet another place we can work with."

The Syncplicity app is free, and compatible with devices running iOS 4.2 or later. Users who want to access their data from more than two computers must pay a $15-a-month subscription fee; to let three people access up to 50 GB of shared documents.