DeckTin is an unofficial, free fan-made app designed for creating and managing Yu-Gi-Oh! decks. It is developed by OC Development in association with YGOPRODeck. The app can be used to build a deck from over 10,000 Yu-Gi-Oh! cards in multiple formats like TCG, OCG, Speed Duel, and more. DeckTin can also organize and manage your virtual Yu-Gi-Oh! card collection from all current Yu-Gi-Oh! TCG sets. The app provides detailed information on every Yu-Gi-Oh! card and full deck validation. It also allows users to export decks in YDK format or text and import a deck from a YDK file. Additionally, users can get full deck price breakdowns from multiple vendors and easily purchase their built decks. DeckTin supports full Light and Dark mode, and users can sign in with a Google Account to build their decks across multiple devices.