Callanish
I can see the attraction of being able to upload your own decks, but then you do have to own the deck in the first place. Celtictarot did point out in the original post that apps can allow you to see/use a deck that you cannot afford to own.
As I said in my other post, one of the things I love with the Fools Dog apps is that you usually get the book as well. I find it really useful to be able to dip into the book that goes with the deck when I am away from home. I may be able to scan in decks that I own, but I can't really scan in the book.
You can scan in the book. The ability to do that has been around for years.
It's called OCR (Optical character recognition) software.
Works with any scanner you plug into any computer, google search for OCR software for the computer you have.
The Tarot & Numerology App allows for including the book reference for each individual deck loaded into it.
Sorry if "silly", sounded harsh but as someone who's both a software developer AND a tarot reader I see things differently.
It's actually very easy to make 1 App in which you can buy/use many decks.
Making a new app for each deck is just clutter and it's also a marketing tool as it raises the FD brand awareness by volume & presence.
It's of no benefit to the App store or the users and if you by several Apps from them it's just burning up your memory space on your phone/tablet.
Each of those FD Apps you install will have 90% of the same code, why can it be shared in 1 App and save space?
Apple's in court right now over memory space wasting on it's devices, you may even see the likes of Apple forcing action on issues like this.
Callanish