Spellbinder is an online collection manager for players and collectors of Magic: The Gathering and Sorcery: Contested Realm. It helps users organize their cards into binders and decks, making it easier to manage collections and keep track of how cards are arranged. Users can trade cards with other members, lend cards to friends, and borrow cards from them. The service also supports importing and exporting collection data and includes a collector view for tracking set completion. Cards can be filtered by attributes such as color, type, rarity, and foil status.

Spellbinder offers visibility controls for binders and decks, allowing users to choose whether each is private, visible to friends, or public. Public collections can be viewed even by people without an account, while private collections are limited to their owner. The site also showcases recently added decks for both supported games, including examples built for Magic formats such as Commander and Legacy. Spellbinder provides privacy, terms, and legal information, and directs users to Jotility for questions, suggestions, or support.