I have that App too, back from when I was trying the low FODMAP diet – and yet still having symptoms. Your book explains that one! I also bought Carol Sinclair’s book which I think was a great start to where I needed to be. I don’t wish to speak too soon, but finding the Digestive Health Institute might well be my holy grail.
I must dust off the Monash App though, it is very good for advising on the type of fermentable carbs in foods.