Dungeon Master Tool

A portable, offline-first DM tool.
Build worlds, run sessions, play together — all in one app.

Website · Releases · Report a Bug

Platforms: Android · iOS · Windows · Linux · macOS  |  Languages: EN · TR · DE · FR

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_{Support development:}

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Roadmap

Planned for upcoming releases — order not final, scope may shift between patch and minor versions.

• Better battle map system — The VTT upgrade has landed: snap-to-grid tokens, creature-size auto-scaling, 5e diagonal measurement rules, AoE templates (cone/line/sphere/cube/sector), and vector shape annotations. Still planned: smoother large-grid performance, stat-block token previews, and line-of-sight + dynamic vision.
• Built-in D&D 5e package visuals — Cover art, monster/species/class portraits, equipment icons, and spell glyphs bundled with the SRD core pack so default content stops looking like raw text.
• More online storage for users — Larger per-account quota for counted cloud media and selectable retention tiers; current beta cap is intentionally conservative (portraits, covers and live session media already sync free of quota).
• Deeper D&D 5e implementation — Close remaining SRD gaps (Drow 120ft superior darkvision, Berserker condition immunities, Lore Bard L3 extra skills, missing auto_granted_by metadata), automate more class/subclass effects, and finish bidirectional sync of mechanical resolutions across devices.
• Full custom-content editors — The rule/effect authoring editor has landed; WYSIWYG editors for schemas, templates, and packages are still in progress so creators stop hand-editing JSON.

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For Worldbuilders 🗺️

Build a setting, then bring it to the table.

• Mind Map — Infinite canvas, Bezier connections, workspaces, undo/redo.
• World Map — Pin system with location data, fog of war, timeline metadata per pin.
• Era Timeline — Track historical eras and waypoints; pin events to specific points in time. Drill into any location for nested pins and a per-era map image.
• Entity System — Schema-driven cards with 16 field widget types (text, markdown, image, stat block, dice roller, and more).
• Templates & Packages — Built-in D&D 5e schema, user-defined templates, full import/export.
• Rule & Effect Editor — Catalog-driven editor for authoring feat/feature mechanics (effect kind + target + per-rule params + predicates/scaling/activation), with non-blocking validation warnings. DM-editable core rule constants (ASI levels, HP-per-hit-die, AC base/shield, proficiency-bonus breakpoints) per template.

Works fully offline. Join the beta to sync your worlds across devices and share them with collaborators.

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For Dungeon Masters ⚔️

Run a session without breaking flow.

• Combat Tracker — Initiative, HP, conditions, turn management, automatic event log.
• Battle Map (VTT) — 6-layer canvas (grid, token, annotation, fog, terrain, decal). Draw tool, persistent rulers and circles, fog of war. Creature-size auto-scaling sizes tokens to their D&D footprint (Large 2×2, Huge 3×3…). 5e diagonal measurement with Euclidean / 5-10-5 (DMG) / 5-5-5 (PHB) rules, mirrored to player distance labels. AoE templates — cone, line, sphere, cube, and sector wedges with fill colors, persistent across reload. Vector annotations — rectangles, lines, and text labels on background / object / GM-only layers, each individually deletable. Per-player projection controls — Show All HP, Hide Token HUD, hidden tokens (DM-only), and DM viewport sync so players mirror your zoom/pan without letterboxing. Reuse already-uploaded location battlemaps without re-uploading.
• Session & Campaign Management — Rich notes, timeline tracking, encounter setup, save state across sessions.
• Soundpad — Layered audio, gapless loops, volume fade, custom themes. Download ready-made soundpacks (music themes, ambience, SFX) from the in-app catalog — browse them under Marketplace → Soundpacks or in Settings.
• PDF Viewer — Page navigation and zoom for your reference docs.
• Dice Roller — d4 through d100.

Second screen, three ways:

• Same device — Pop out a second window for your TV or projector.
• Different device — Cast battle maps, entity cards, and images to a tablet or laptop on the side.
• Online players — Project directly into every connected player's app. Per-world manifest replays the active view so late joiners catch up instantly.

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For Players 🎲

Roll up a character, then take it anywhere.

• Character Creation Wizard — SRD-driven: species, subspecies/lineage, class, subclass, background, ability scores (point-buy, standard array, roll, manual), skills, equipment, traits. Works with imported (Open5e) packs too — packaged subclasses, origin feats, spell lists, and feat prerequisites resolve into the wizard, and every option shows its source.
• Level-Up Planner — Auto-applies HP, proficiency bonus, hit dice. Queues ASI/feat, fighting styles, subclass, spell choices as Pending Choices you resolve inline.
• Multiclass — Full SRD prereq checks (AND/OR ability gates) with human-readable rejection reasons. Multiclass caster slot math built in.
• Weapon Mastery — Auto-grants mastery slots per class/subclass; takes the max across overlapping feats.
• Online Worlds — Join any world the DM publishes, claim a character, see live updates from every device at the table.
• Battle Map Marks — Place your own markers on the projected map during play.

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Online & Offline

Everything core works fully offline. Online features (sync, sharing, marketplace, social) require a free account.

• Closed-Beta Online Play — When a DM is in the beta, the whole table plays together online. Only the DM needs a beta slot; players just join.
• Share a World — Publish a world so players can join and see live updates. One active invite code per world; generate, copy, revoke at will.
• Realtime Sync — Character, member, and entity changes stream to every connected client via CDC. Offline edits reconcile on reconnect.
• Roles — Player and DM roles with row-level security.
• Character Ownership — Claim a world character, release it back, or delete it (DM only, if ownerless).
• Personal Cloud Sync — Back up characters, worlds, templates, and packages to your account; pick them up on another device.
• Cloud Media Tiers — Portraits and covers sync free of quota. Entity images and battle maps count against your quota with per-kind size limits. Live session media uses a shared transient pool that does not bill your save space.
• Graceful Offline — Network screens show a clean "You're offline" placeholder and auto-recover. Outbox writes flush on reconnect.

Marketplace

• Publish & Share — Worlds, templates, packages, characters as immutable snapshots with title, description, tags, changelog, cover image.
• Versioning — Every publish is a new version. Lineage tracking links every release of the same item.
• Browse & Download — Filter by type, language, tags. Atomic download counters; built-in vs. community sections.
• Contents Preview — See what a world or package holds before downloading. A publish-time content summary (template name + per-category entity counts and names) drives a preview dialog and richer cards — no need to pull the full payload to know what's inside.
• Integrity — Database-enforced immutability on core metadata prevents silent edits post-publish.
• Official Content — A curated, app-owned catalog of first-party packages served from a public CDN. Surfaces under Marketplace → All / Packages with a details dialog and an Install action; works offline via a bundled fallback manifest. Banner art downloads from the CDN and is materialised as the local package cover on install. Includes Open5e-sourced content — 19 packages spanning thousands of monsters, spells, magic items, and full chargen data (classes, subclasses, species, backgrounds, feats).

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Social & Community

• Public Profiles — Username, display name, bio, avatar, follower counts. Discovery opt-out supported.
• Follow System — Optimistic follow/unfollow; browse followers and following per profile.
• Activity Feed — Text and image posts, likes, switch between all and following only. Server-side rate-limited.
• Direct Messaging — Realtime 1-to-1 and group chats. Unread counters, group rename, member leave, admin-managed deletion.
• User Discovery — Suggested profiles and username search with prefix matching.
• Game Listings — Post open games with system, seats, schedule, language, tags. Filter by language/system/tags.
• Applications — Players apply with a message; listing owners accept, reject, or applicants withdraw.

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Images

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Installation

Android

1. Download DungeonMasterTool-Android.apk from the latest release.
2. Enable "Install from unknown sources" if prompted.
3. Open the APK to install.

Windows

1. Download DungeonMasterTool-Windows.zip from the latest release.
2. Extract and run dungeon_master_tool.exe.

Linux

1. Download DungeonMasterTool-Linux.zip from the latest release.
2. Extract and run:

   unzip DungeonMasterTool-Linux.zip
   cd bundle
   ./dungeon_master_tool

macOS

1. Download DungeonMasterTool-MacOS.zip from the latest release.
2. Extract and drag dungeon_master_tool.app into Applications.
3. Remove the quarantine flag:

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

4. Launch from Applications or Launchpad.

iOS

Note: iOS builds are currently unsigned. Sideload via Xcode or a signing service.

1. Download DungeonMasterTool-iOS.ipa from the latest release.
2. Sideload using Xcode, AltStore, or similar.

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Development

cd flutter_app
flutter pub get
dart run build_runner build --delete-conflicting-outputs
flutter run

See flutter_app/README.md for full developer documentation and CONTRIBUTING.md for contribution guidelines.

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License

Licensed under CC BY-NC 4.0. See the LICENSE file for details.

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Contact

Platform	Link
GitHub Issues	Report a Bug
Instagram	@erenorhun
LinkedIn	Orhun Eren Yalcinkaya
Email	orhun868@gmail.com