One Realm is an AI-powered virtual tabletop and campaign manager designed for Dungeons & Dragons 5th Edition. It brings campaign preparation, organization, and online or in-person play together in one workspace, helping game masters spend less time on setup and more time at the table.

Users can import adventure PDFs and notes, which One Realm analyzes to identify and connect characters, locations, maps, facts, mechanics, and story details. An AI assistant can help create and update campaign content, while manual editing remains available. The platform organizes campaigns through connected views for scenes, the changing world, and reusable content such as stat blocks, items, templates, and mechanics.

For play, One Realm offers tools for tracking characters, relationships, story developments, and dice rolls across devices. Its AI character sheets let players ask questions, update spells, and roll with relevant modifiers. Map tools can detect rooms, walls, and doors, with options to refine geometry and use line of sight. Users can also generate regions, dungeons, encounter maps, portraits, map props, and custom frames.