I've been googling a bit more and can see that to leverage siri into a 3rd party app then need to use these requests (intents) and use Sirikit to link what your request is with the app. I can see that Siri can create 'To-do lists', create notes, reminders etc as already integrated features but not a calculator or spreadsheet that can be filled (via voice) and then the cell totals added up. Does anyone know whether this is possible first before I try to figure out how to do it.