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.
Session 14 · The Drowned Keep
a three ring binder, one lined paper and the tool
offline ✓
0
Forever — no tiers
01 The tools
Worldbuilding, dungeon mastering and player tools in one free app — fully offline, no account to start.
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: the same city before the war and after it. Grid, scale, drawing and fog of war included.
Cards for NPCs, monsters, spells, items and locations, where every reference is a link. Pin cards, preview with a long press, search by name, tag or text.
Every world is built on a template (D&D 5e is built in) and pulls content from packages: bundles of cards you install into any world, link to other packages or share on the marketplace. Custom templates are coming.
An infinite canvas for the ideas you haven't organised yet: factions, pantheons, plot hooks. Linked nodes, workspaces, freehand drawing, undo/redo.
The session screen is the map. Initiative, HP, conditions and turn order sit on top of layers, fog, AoE templates, 5e diagonals, sized tokens and a DM-only layer.
Dice roll across the screen in named styles. Skills and saving throws roll straight from the character sheet, and every roll lands in the session log.
Layered ambience with gapless loops, fades and ready-made soundpacks. PDFs live inside the world, open in tabs and can be shared with players.
Species, class, subclass, background and feats fold into one sheet: senses, resistances, proficiencies, traits and always-prepared spells, each showing where it came from. Multiclass prerequisites and spell slots, class resources like Rage and sorcery points, weapon mastery, short and long rests.
Species, class, subclass, background, ability scores, skills, starting gear and feats from the SRD and any installed pack.
Automatic HP, proficiency and hit dice; ASIs, feats, subclass and spell picks wait as pending choices.
Join with an invite code, claim a character, move your own token on your turn and send rolls to the DM's log. Shared cards update when the DM edits them.
Built in and offline, with card art for 1,247 SRD cards. The SRD text can also be shown in Turkish.
Tome of Beasts 1–3, Creature Codex, Black Flag SRD, Deep Magic, Tal'Dorei and more, one tap away and no account needed.
99 Devils of Uzrah's Palace, Army of the Damned, The Cold Bounty and our own Turkish campaign Aegis Act 1.
★ Second Screen
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. Fog of war and hidden tokens stay hidden.
Send the view to a second window on the DM's desktop — its own monitor, free to pan and zoom without touching your work.
Cast the projection to a TV or monitor in the room, so the table gets a screen of its own.
Push the same projection to every connected player's app — at the table or across the world.
★ Your devices, your choice
Export a world, package or character to a single .dmtz file and import it on any
device, with no account and no network. Or put it online and it stays the same everywhere you
sign in.
A world with its maps, cards and media goes into one .dmtz file and merges
on import.
Move it by USB, cloud drive or chat. Nothing passes through our servers.
An online world, package or character stays in step on every device you sign in on.
02 The quiet stuff
No flashy features — just the decisions that decide whether you keep using a tool.
Run the whole app without an account. Online is an option, not a gate.
Publish a world and players join with a revocable invite code.
Publish worlds, packs and characters as versioned snapshots; profiles, feeds and group chat.
One world, five platforms at the same table — Android, iOS, Windows, Linux, macOS.
Interface and help in EN, TR, DE and FR; SRD text also in Turkish.
No premium tier, no subscriptions. The SRD 5.2.1 is built in; CC-licensed packs are one tap away.
03 Screenshots
No mockups — real screens from the running build.
04 Get started
Free and open source. Pick your platform.
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 builds are currently unsigned. You'll need Xcode, AltStore, or a similar signing tool to install the app.
Download the latest DungeonMasterTool-iOS.ipa release.
Sideload it with Xcode, AltStore, or another iOS signing service.
App Store distribution is not available yet.
Download, extract, and run. No installation required.
Download Windows .zipExtract the folder and run
dungeon_master_tool.exe
Download and run from terminal.
Download Linux .zipunzip DungeonMasterTool-Linux.zip cd bundle ./dungeon_master_tool
This app is not signed with an Apple Developer account. You'll need to remove the quarantine flag after installing.
Extract the downloaded .zip file.
Drag dungeon_master_tool.app to your Applications folder.
Remove the quarantine flag:
sudo xattr -rd com.apple.quarantine /Applications/dungeon_master_tool.app
Launch from Applications or Launchpad.
For Apple Silicon & Intel Macs.
05 Get in touch
I read every piece of feedback — bug report or feature request, reach out.
