This app is a great way to keep records of all of your decks as well as formulate new decks. It even has a feature that lets you draw 5 random cards from your deck to see what a potential opening hand may look like! However, in the past month, I've been able to open the app a grand total of 2 times. Every other attempt has result in the app crashing or just giving me a black screen. The app is great when it works, but right now it doesn't. A black screen is worth only 1 star to me.