If you know how it's done, you know it takes practise. This app can help, by generating a random audience selection every time you swipe on the screen. You work out the correct orientation and card to find in the deck, then tap the screen to see if you got the answer right. Practise in the train on the way to work, while waiting for the dentist, or just sitting at home on the couch. Beats opening and closing your expensive Invisible Deck pack (and potentially breaking it before you are even ready to show anyone your skills)
*I am not teaching you the trick sorry this app is for magicians who already know the secret of the Invisible deck. Trick deck of cards not included!