This app provides the list of all of the armor in the game. It also shows the materials needed to upgrade the armor. The user can click on the armors to show that they have ownership of the armor, and the list will automatically update to show the costs for the next level of that armor. It also has a Materials tab which shows the total amount of materials needed to upgrade the remaining armor.

You can easily keep track of what materials you need to keep, so it can help you decide whether you can sell or use materials, or if you should save them for a later upgrade.