OneDex is a mobile application for iPhone that functions as a card scanner and price tracker for the One Piece Trading Card Game (TCG). The app allows users to scan any One Piece TCG card using their device’s camera, automatically identifying the specific variant of the card, including standard prints, alternate arts, promos, and special editions. After scanning, users can add the card to a digital collection and view its current market price, which is sourced from TCGplayer for English cards and updated daily. The app covers every card and variant across all English sets, with a database of over 7,300 cards and 84 decks and sets. Key features include variant recognition to distinguish between different versions of the same card, which can have significantly different market values. Users can view each card’s price history and see which cards in their collection have changed most in value over the past week. The app supports multiple collections, allowing users to organize cards by favorites, trades, or set completion goals, and track their progress toward finishing each set. The workflow involves pointing the iPhone camera at a card, confirming the recognized variant, saving the card to a collection, and then monitoring the collection’s total value over time. OneDex is available for free on iOS. It relies on TCGplayer market data for pricing and requires an internet connection for price updates. The app is designed for collectors and players who want to manage their physical card inventory, assess the value of their holdings, and stay informed about market trends without manual data entry.