Dungeon Ledger is a shared notebook and campaign management platform for Dungeons & Dragons and other tabletop role-playing games. It gives players and Dungeon Masters one place to record campaign details, connect ideas, and keep track of events between sessions. Notes can be organized as characters, NPCs, locations, quests, session logs, secrets, or general entries, with individual visibility settings that let DMs share information deliberately while keeping hidden material inaccessible to players.

As groups write, links between notes automatically form a searchable knowledge graph, helping users trace relationships and recall details from earlier sessions. The Living Book answers campaign questions using notes the person asking is allowed to see, and cites its sources. Other features include a compendium with SRD content and space for homebrew, shared calendars, maps with linked locations, synchronized soundboards, playable puzzles, dice, and counters. Dungeon Ledger also offers 12 browser-based tools, including an encounter builder, challenge-rating calculator, and initiative tracker.