I had been using Excel for flight planning until I switched to Ozrunways. (My spread never look as impressive as AX.) They say this approved by CASA, I assume this applies to the W&B as well as everything else.
Assumption is the mother of all ****ups.
CASA Approval | OzRunways | The CASA Approved Australian Electronic Flight Bag, Flight Planner, GPS Navigator for iPad
MAPS, DAPS, ERSA and AIP
anything else and you're on your own. It may be possible to get a WCO to approve Ozrunways as a loading system, but each loading system for the aircraft has to be approved. Ozrunways generically does not have this approval, as they can't guarantee the data you enter about your own aircraft is correct (or that it is locked and you're prevented from modifying it).