DMM Maica, formerly Mycalinks, is a trading card management app from the DMM Group, created to help collectors quickly understand what they own and how much their collections are worth. Supporting 32 card categories, including Pokémon, Yu-Gi-Oh! and One Piece, the app lets users register cards, graded cards, unopened packs and boxes by type, rarity or release set. Collectors can track quantities, view collection lists and monitor estimated values as market prices update.

DMM Maica also offers card price-history charts, favorites for tracking cards not yet owned, portfolio and category-based asset views, and transaction histories for purchases and sales. Users can record details such as purchase date, condition, store and notes, and review holdings by condition. A deck feature compares a Pokémon Standard deck list with registered cards to show what is missing. Card detail pages provide information such as set and rarity, while similar-card listings support further browsing. The service also provides e-commerce purchasing, bringing collection management, market research and shopping together in one app.