It's a good idea however the app definitely needs some work. There are barely any in app descriptions of items and explanations. Once you put down a portal mod, you can't switch it out, even if it's yours. Same for links however you can upgrade resonators. There seems to be no reason for this other than they couldn't be bothered to add it and so removing items from a portal becomes a complicated and expensive fiasco relying on turning your portal to the other team and then destroying bits.