Tools & Platforms
Open Game Master
English
Dungeons & Dragons
Open Game Master runs multiplayer (and solo) 5e campaigns with an AI Game Master (or a human one), on your own machine. The narrator is whichever AI you already have: a local model (llama.cpp, Ollama, LM Studio, vLLM), an API key (OpenAI, OpenRouter, or any OpenAI-compatible endpoint), or a CLI agent you already pay for (Codex, Grok Build, Claude Code, opencode), which narrates on its own subscription with no API key handed over; Codex, Grok and comfyui paint the pictures.
The model is the creative mind and narrator; a stack of server-side engines enforces the 5e rules for both the players and the GM. The narrator never owns the numbers: dice, hit points, spell slots, conditions, and the death track are computed and clamped by the backend, and the model changes game state only through tools the server validates.
The AI drives the session, requesting rolls, starting encounters, and playing NPCs and companions, following a secret story arc it regenerates as the campaign moves.
Made by a team of passionate devs and gamers.