free, no account needed

Run the table,
not the paperwork.

Dungeon Master Tool is a free, offline-first app for building worlds, running combats and sessions, and playing together across five platforms. Everything runs on your device — online is an option, not a gate.

Download free What's inside
Runs on
Android iOS Windows Linux macOS
Dungeon Master Tool interface with a world map

Session 14 · The Drowned Keep

a three ring binder, one lined paper and the tool

offline ✓
Support development
Patreon thanks.dev GroupFinder Library
5 Platforms
4 Languages
Free0 Forever — no tiers
100% Works offline

01 The tools

Everything the table needs

Worldbuilding, dungeon mastering and player tools in one free app — fully offline, no account to start.

Worldbuilding

Mind Map

An infinite canvas for the ideas you haven't organised yet — factions, pantheons, plot hooks. Bezier links, nested workspaces, undo/redo.

World Map & Eras

Drop pins on a map image and link them to entities, sessions and events. Every era gets its own map and timeline, and you can hide the parts of the world the party hasn't reached.

Packages

Content as one-tap bundles: spell packs, monster lists, treasure sets, whole modules. Import them into any world, export your own, share them on the marketplace.

Dungeon Mastering

Combat & Battle Maps

Run initiative, HP, conditions and turn order on a six-layer canvas — grid, tokens, fog, terrain, decals — with persistent rulers and AoE templates. Every action lands in the session log.

Sessions & Campaigns

Each world keeps its sessions: notes, timeline events and encounters that survive between games. Pick up exactly where you stopped.

Soundpad

Layered ambient audio with gapless loops and fades. Build a theme for the tavern and one for the dungeon, then crossfade mid-scene.

Players

Character Creation

A wizard that walks you through species, class, background, ability scores and gear. SRD content built in, Open5e packs to extend it.

Online Play

Join the DM's world, claim a character and play. All features are available from the start — no approvals, no waiting lists.

Personal Notes

A private notes field on every character and entity — backstory, plans, reminders. It stays with your world and syncs to your devices.

★ Second Screen

One world, every screen at the table

Push battle maps, images, entity cards and PDFs to a pop-out window, an external display, or every connected player's app. You decide exactly what the table sees — and when.

Pop-out window

Send the view to a second window on the DM's desktop — its own monitor, free to pan and zoom without touching your work.

External display

Cast the projection to a TV or monitor in the room, so the table gets a screen of its own.

Player apps

Push the same projection to every connected player's app — at the table or across the world.

★ Local sync — the one people ask about

Your world moves with you.
Your table stays yours.

Move worlds, packages and characters between your own devices over Wi-Fi — no internet, no account, nothing uploaded. Pair with a QR code or IP + PIN, and the transfer happens directly between your machines.

Pair once, sync often

Wi-Fi pairing by QR or IP + PIN between any of your devices.

Stays on your network

Nothing is uploaded — the data travels between your own devices.

The whole campaign moves

Worlds, packages and characters — everything you build travels between your devices over Wi-Fi.

02 The quiet stuff

The details that matter in year two

No flashy features — just the decisions that decide whether you keep using a tool.

Offline-first

Run the whole app without an account. Online is an option, not a gate.

Share a world

Publish a world and players join with a revocable invite code.

Marketplace & social

Publish worlds, packs and characters as versioned snapshots; profiles, feeds and group chat.

Cross-play

One world, five platforms at the same table — Android, iOS, Windows, Linux, macOS.

4 languages

Interface, help and content in EN, TR, DE and FR.

Free, always

No premium tier, no subscriptions. The SRD 5.2.1 and CC-licensed packs ship with the app.

03 Screenshots

Straight from the app

No mockups — real screens from the running build.

04 Get started

Download the build

Free and open source. Pick your platform.

Android

Download the APK and install directly on your device.

Download APK Loading version…

You may need to enable "Install from unknown sources" in device settings.

iOS

Sideload required

iOS builds are currently unsigned. You'll need Xcode, AltStore, or a similar signing tool to install the app.

  • 1

    Download the latest DungeonMasterTool-iOS.ipa release.

  • 2

    Sideload it with Xcode, AltStore, or another iOS signing service.

Download iOS .ipa

App Store distribution is not available yet.

Windows

Download, extract, and run. No installation required.

Download Windows .zip

Extract the folder and run dungeon_master_tool.exe

Linux

Download and run from terminal.

Download Linux .zip 
unzip DungeonMasterTool-Linux.zip
cd bundle
./dungeon_master_tool

macOS

Security note

This app is not signed with an Apple Developer account. You'll need to remove the quarantine flag after installing.

  • 1

    Extract the downloaded .zip file.

  • 2

    Drag dungeon_master_tool.app to your Applications folder.

  • 3

    Remove the quarantine flag:

    sudo xattr -rd com.apple.quarantine /Applications/dungeon_master_tool.app
  • 4

    Launch from Applications or Launchpad.

Download macOS .zip

For Apple Silicon & Intel Macs.

05 Get in touch

Found a bug? Have an idea?

I read every piece of feedback — bug report or feature request, reach out.