Dropbox, the fast-growing file-synching and file-sharing service, today announced new tools that could help the company become an indispensable ally to developers in an increasingly fragmented mobile ecosystem.

The growth of smartphones and tablets spawned a whole new app economy, as well as a vexing problem for app developers: how to make an app that’s running on one device, such as a game on an Android smartphone, synch up with the same game running on every other device a person may use, from iPads to Linux laptops.