To my knowledge I am the sole user of my QuickLedger project -- so I'd be very interested to hear how it works for another's use case. Any feedback would be great! If you fork I'd like to know so I can see what someone does with it.
Pythonista would make possible to run QuickLedger on the mobile, and it could be expanded to automatically update the main ledger, hosted on another machine or on some Dropbox-like container.