The Up app will roll out across these various platforms over the month of September, according to Jawbone's spokesperson, at which point there will be two apps you can choose from: the existing Up application for Up band owners, which you can find on iOS and Android, as well as a separate open-access app for everyone else.

Update: Pebble users haven't been left behind: Jawbone is also building an activity tracking app for the Pebble and Pebble Steel smartwatches.