Install the app
The app is the same on every platform: it draws the game screens itself, keeps your saved servers and sign-ins, and carries a complete server inside it so it can host a world of its own. The current release is v0.17.2, published 2026-10-11. Every build is free, MIT licensed and served from GitHub releases; the Android app is also headed for Google Play.
Pick your download
| Platform | File | Notes |
|---|---|---|
| Windows 10 or 11, 64-bit | Installer (.exe) | Choose the install folder. Updates itself from inside the app. |
| macOS, Apple Silicon | Disk image (.dmg) | Not notarized yet: the first open needs Open Anyway in Privacy & Security. See Install on macOS. Updates itself. |
| macOS, Intel | Disk image (.dmg) | Same as above, for Intel Macs. |
| Linux, any distribution | AppImage | No install. Make it executable and run it. Updates itself. |
| Debian, Ubuntu, Mint | .deb package | Installs to /opt; the app installs the next .deb itself, asking for your password. |
| Fedora, RHEL, openSUSE | .rpm package | As above, with an .rpm. |
| Linux, Flatpak | Flatpak bundle | Sandboxed. Cannot start a local model or an agent program from inside the sandbox. Updates itself. |
| Linux, portable | Tarball | Unpack anywhere and run the binary. Updates itself. |
| Android 8.0 or newer, 64-bit | Google Play or the APK | The APK is the same build for people who sideload. See Install on Android. |
There is no iOS app yet. An iPhone can still join a world in Safari through the invite link. On a Steam Deck any Linux build runs; added to Steam as a non-Steam game it starts full screen in Game Mode and takes the controller (see Install on Linux).
What the installers set up
- The
odm://link handler. Every installer registers it with the operating system, so clicking an invite link a friend sent opens the app straight on the join screen. On Android the app also claimsopendungeonmaster.com/jlinks once the Play listing's signing certificate is verified. - A private data folder. Saved servers, sign-in tokens (kept in the OS keychain where one exists) and your device world live in the app's own data folder, never inside the install location. Reinstalling or updating keeps them.
- The bundled server. On first start the app copies its server out of the read-only install into that data folder, so an AppImage or a Play install can write to its own world.
What you see on first launch
The title screen, never a sign-in form. A first run shows Begin your world with one button, Start playing, beside a menu with Join with a code and Add a server for anyone who was sent an invite. Naming your adventurer creates your device world and makes you its owner; then the app asks who runs your games (a human, your OpenAI key, or on a desktop a local model or an agent you already have). A short guided tour walks the title screen once and can be replayed from Settings.
