If you're looking for a way to catalog your brick collection and figure out which bricks you need for which sets, Bricksee is a great option. The app uses sophisticated machine learning technology to help you rebuild old brick sets with a single tool for brick identification and set tracking. With a catalog of more than 10,000 sets, you can add your own and take photos of bricks in a layout to identify and reassemble missing elements. The app shows detailed part information and set information, so you can see instructions and track your progress.