Momentum was released today. Please check it out at
http://momentum.cakewalk.com/Its free to download and try all flavors of the multi-platform app and the plugin.
After you try it I hope you will agree that there is nothing out there that can match the ease at which you can capture ideas on the go and then recall them instantly on any device or your favorite DAW without putzing with file sharing services and transferring files and folders back and forth. This is all managed transparently through Momentum Cloud Sync, which manages uploads and downloads in the background as you work. And yes we completely support offline use. When you are online the app automatically checks for the latest ideas on the cloud and syncs your device with no manual intervention.
The main reason this is a subscription service is because of ongoing bandwidth and server costs to run this service. Starting at $2.99 per month or $29.99 annually for unlimited ideas its a pretty good deal. I think most people would pay more for a cup of coffee!