The app doesn’t give users the option to sign into their account but instead, let’s them access all public information about any user they add into the app. Adding a new Xbox Live user will show the gamer’s status and achievements along with the avatar they have selected. The app is free in the market and has been available for a very long time. It has been receiving constant updates by it’s creator which improve the speed of the app but there are still options that I would love to see added like a refresh button or the ability to send messages within the app. This technically can’t be added though because of Microsoft’s restrictions. But overall it is definitely a useful app. Check it out.