Slay the Spire: TBG Companion is the official companion app for Slay the Spire: The Board Game. It offers a range of features to enhance your board game experience. The app includes a comprehensive Compendium that serves as a reference for all game cards, events, items, enemies, and more, with filters and search functions for easy access to specific cards.

Moreover, the app provides an interactive Rulebook with search capabilities and links to relevant sections. Players can enjoy a Music Player feature to listen to favorite tracks from the original video game, along with bonus tracks like the Trailer Theme and the remix album Slay the Spire: Reslain.