Eric Ford, regarding the recently released Hearthstone update:

As you might expect, the iPhone version of Hearthstone is basically the Hearthstone we all know and love on iPad except… smaller. The primary changes have to do with how you interact with your cards during matches. For example, on the iPad version all your cards are simply at the bottom of the screen and you’re free to thumb through them at your convenience while the match is being played out. On the iPhone version, your cards are shown on the bottom right of the screen and tapping them expands the view and allows you to actually interact, see descriptions, and play said cards. Expanding the card view blocks most of the field of play, which is the primary concession made for Hearthstone making the transition to iPhone.

Even if you’re not interested in playing Hearthstone on your iPhone and would rather stick to playing on iPad or other platforms, it’s still worth installing the app. Blizzard will give you a free pack just for logging in with your account (which is the case for the app on Android, too).

I’ve been playing Hearthstone for a couple of months now and it’s great — easily one of my favorite games of all time. And, the lofty praise is warranted. It’s everything I love about Magic: the Gathering wrapped up in a beautifully design with unique game mechanics and always available, competitive, constructed gaming on the devices I use most. I’ll be installing Hearthstone on my iPhone as soon as I have a spare 743MB.

And if you’re new to the game, TouchArcade’s Hearthstone Beginner’s Guide by Tasos Lazarides is also worth browsing.