This is a general cheat app in which, as the title explains, you can add things to the hotbar and inventory. This app is only for Kindle and Android.
This will allow you to edit Armor so it will be more durable. As it is only for Android and Kindle, this is a dissapointment to those who have Apple.
While this is new, it is apparently a good app. Although you can get free diamonds, it takes all the fun out of playing, so I suggest starting a "No Cheats" world in which you can freely play Survival.