Yes!
Outsmarted can be registered on up to three personal devices.  However, remember NOT to try and register the app on multiple devices if you plan to use them in the same game!  Only one registered device should be part of any one game.  You may play with up to 6 additional devices in the same game, but the app does not need to be registered on any device but the host!  We strongly recommend registering the app on only one device unless you have a clear reason to do so (such as getting a new phone or tablet).