A TCG card scanner app analyzes a photograph, identifies card metadata, and connects the likely match with available pricing data. How Card Scanning and Photo Identification WorkA TCG Card Scanner App usually begins by locating the card border, artwork, symbols, text, and card number within a photograph. If you need an app that identifies a card from a photo, a TCG card scanner app is usually the fastest solution. How does a card scanner identify a Pokémon card? Card Value Scanner is one option for adding market-price context after the card details are verified.