seedcake
No apps for me. I haven't thought about it. Shuffling by yourself or just touch cards - I believe they get nice amount of my energy and I feel they're mine.
One of the reasons why the tactile sensation of using the cards, and the gut-feelings that we get through connecting with them affects or readings, may (or may not) have to do with what has been called the Second Brain. This is not a new idea to certain mystical schools, but even publications as august as Scientific American have reported on it in recent years;
If you want to go further, Google "Penrose-Hameroff 'Orch OR' Model of Consciousness" which can be summarised in a nutshell as a controversial theory based on an idea by Sir Roger Penrose GLE*, that everything in the brain is connected to everything else in the Universe at the quantum level of reality.
(*GLE = Greatest Living Englishman)