Dungeon Master Tool

The DM's toolkit for worldbuilding and running sessions. Free, offline-first, cross-platform.

Overview

A portable, offline-first DM and worldbuilding tool.
Build worlds, run sessions, share with others and play together, all in one app.
License: CC BY-NC 4.0 · Free to use
Everything core works without an account. You only need one to play online, publish to the marketplace, or download other users' content.

Worldbuilding

  • Era Timeline: Split your world's history into eras on a timeline bar and move between them. Each era keeps its own map, pins, nested location maps and day-by-day timeline pins linked to cards and sessions. You can show the same city before the war and after it.
  • Templates & Packages: Every world is built on a template (D&D 5e is built in) and pulls content from packages. A package is a bundle of cards you can install into any world, link to other packages, or share on the marketplace. Custom templates are coming.
  • Codex: Schema-driven cards for NPCs, monsters, spells, items, locations and more. Every reference is a tappable link. Pin cards to the top, preview any card with a long press, and search by name, tag, category or text.
  • World Map: Pins, grid and scale, drawing, fog of war, and nested maps you can walk into (districts, dungeons, taverns).
  • Mind Map: An infinite canvas with linked nodes, workspaces, freehand drawing and undo/redo.

Running the Session

  • Second Screen: Give the table its own view. Pop out a window onto a second monitor, cast to a TV or projector, or project into every connected player's app. You choose how battle maps, images, cards and PDFs go out. Fog of war and hidden tokens stay hidden.
  • Battle Map: The session screen is the map, with the encounter panel and event log on top. It has layers, fog of war, AoE templates, 5e diagonal rules, creature-sized tokens, shapes and text, a DM-only layer, hidden tokens, movement trails for the round, and two maps joined into one.
  • Combat Tracker: Initiative, HP (with hit-dice rolls), conditions, turn order and an event log.
  • 3D Dice: Dice roll across the screen with named styles. Skills and saving throws roll from the character sheet with one tap.
  • Soundpad: Layered ambience with gapless loops, fades and ready-made soundpacks.
  • PDF Library: PDFs kept inside the world, opened in tabs and shareable with players.

Characters

  • Full 5e rules: Species, class, subclass, background and feats fold into one sheet. Each sense, resistance, proficiency, trait and always-prepared spell shows where it came from. Also covers multiclassing, spell slots, class resources (Rage, Bardic Inspiration, sorcery points…), weapon mastery, and short and long rests.
  • Character Builder: Pick species, class, subclass, background, ability scores, skills, starting equipment and feats from the SRD and any installed pack.
  • Level-Up: HP, proficiency bonus and hit dice update automatically. ASIs, feats, subclass and spell picks wait as pending choices.

Playing Online

  • Online worlds: Put a world, package or character online and it stays the same on every device you sign in on. Players see the pictures even when the DM is offline.
  • Players: Join with an invite code, claim a character, move your own token on your turn, and send dice rolls to the DM's log. Shared cards update when the DM edits them.
  • .dmtz files: Export a world, package or character to one file and import it anywhere. No account or network needed.

Content

  • SRD 5.2.1: Built in and works offline.
  • 19 one-tap packs: Tome of Beasts (1–3, 2023), Creature Codex, Monstrous Menagerie, Black Flag SRD, Deep Magic, Tome of Heroes, Vault of Magic, Tal'Dorei and more.
  • Ready-made worlds: 99 Devils of Uzrah's Palace (Shadowdark), Army of the Damned, The Cold Bounty, and soon our own campaign Aegis Act .
  • Marketplace: Publish worlds, templates, packages and characters as versioned snapshots with content previews.
  • Social: Profiles, follows, an activity feed, direct and group chats, and game listings with applications.

Key features

Second Screen

Pop out a window, cast to a TV or project into every player's app. You choose what goes out: maps, images, cards or PDFs.

Works Offline

Everything core works with no account and no internet. Move content between devices with a single .dmtz file.

Battle Map

Layers, fog of war, AoE templates, creature-sized tokens and a DM-only layer. Hidden tokens stay hidden from players. Initiative, HP, conditions and turn order in one panel. Every action lands in the session's event log.

Era Timeline

Split your world's history into eras and move between them. Each era keeps its own map, pins and day-by-day timeline.

World Map

Pins, grid, drawing and fog of war. Walk into nested maps for districts, dungeons and taverns.

Codex

Cards for NPCs, monsters, spells, items and locations, where every reference is a tappable link. Search by name, tag, category or text.

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