All apps in the iMtG family share the same core functionality and modules. The difference is mostly of legal nature but with some logistics and release differentiation.
iMtG - Probably the best MTG toolbox app for iPhone, iPad and iPod Touch. (https://geo.itunes.apple.com/app/imtg/id412798013?mt=8&at=10l74t) For the youngest of players.
This version is the first to get new functionality modules. It ships with MTG database but it can be upgraded in-app to all supported card games.
iMtG Plus - Probably the best TCG toolbox app for people over 17 (with MTG, Pokemon, YuGiOh, ForceOfWill). (https://geo.itunes.apple.com/app/imtg-plus/id736075015?mt=8&at=10l74t) It ships with database containing all supported card games. Due to the nature of our release process this is a more stable version than basic iMtG.
iMtG U - Probably the most powerful TCG toolbox app for anyone. (https://geo.itunes.apple.com/app/imtg-for-education/id1128096619?mt=8&at=10l74t) It is the first to be upgraded to latest iOS SDK platform. It ships with data for all supported TCGs and the Database Upgrades are delivered via quicker iMtG Server. It does not contain any In App Purchases nor 3rd party ads and therefore iMtG Server subscription is included in the price of this iMtG package.