I recently played the ES board game and fell in love with it. I found out today from my best friend (the one who introduced the board game to me) that there was a mobile app for it.
After my first game on the app, I only saw a few slight differences. You dont have full access to everything the board game has, mainly its missing Blessings/Curses and Allies. Makes it more challenging.
In app purchases are cheap, and you get a ton of stuff. I will definitely be doing those purchases in the future.
All in all this app in my opinion is worth the $3.00 for the base. (Add $9.00 to get the other 3 in app expansions).
Daigan Nightshade about Elder Sign: Omens for iPhone