Game mAIster
A free, open-source web app that turns your own ChatGPT, Claude, Gemini or DeepSeek API key into an AI Game Master for tabletop RPGs like Shadowrun, Vampire the Masquerade and Call of Cthulhu.
🔗 Visit Game mAIster
Description
Running a tabletop RPG session usually needs a human game master who plans the story, plays every NPC, and improvises when players go off-script. Game mAIster hands that job to an AI model you already have access to.
Game mAIster is an open-source web app (React frontend, Python backend) that turns ChatGPT, Claude, Gemini or DeepSeek into a narrative Game Master for tabletop-style RPGs, with dedicated theming and support for systems like Shadowrun, Vampire the Masquerade and Call of Cthulhu. It handles mission creation, saving and loading campaigns, response regeneration, and text-to-speech playback of the AI's narration. It's free and self-hosted from GitHub (stdkoehler/gamemAIster-frontend and -backend) — you bring your own API key for whichever LLM you want to use, so there's no subscription to Game mAIster itself, but you do pay your chosen AI provider for usage.
💬 Our review
The short version: a fun, functional hobby project for solo or small-group tabletop RPG fans who don't mind a bit of setup — it's genuinely free with no vendor lock-in since you bring your own AI provider, but it's an early-stage open-source project (0 GitHub stars on both repos) rather than a polished commercial product, so expect rough edges.
Unlike AI Dungeon or Friends & Fables, which are hosted commercial products with their own subscription and built-in AI, Game mAIster asks you to run the frontend/backend yourself (or find a hosted instance) and supply your own API key for ChatGPT, Claude, Gemini or DeepSeek — meaning your total cost is just what you'd pay that AI provider directly, with no markup. That's a genuinely different value proposition: more setup effort, but full control and no subscription to the tool itself. With zero GitHub stars on both repositories and no official license specified, it's worth treating as an actively-developed but still very early hobby project rather than something with guaranteed long-term maintenance. Best fit: technically comfortable RPG players who already have API access to an LLM and want a dedicated interface for running solo or small-group campaigns without paying a subscription; skip it if you want a polished, zero-setup experience — AI Dungeon or Friends & Fables will get you playing faster.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Application gratuite et auto-hébergée. Aucun abonnement à Game mAIster — l'utilisateur fournit sa propre clé API (ChatGPT, Claude, Gemini ou DeepSeek) et paie directement son fournisseur d'IA selon son usage.
Pros
Gratuit et open-source, aucun abonnement au service lui-même — seul le coût de l'API IA choisie s'applique
Prend en charge plusieurs systèmes de jeu dédiés (Shadowrun, Vampire the Masquerade, Call of Cthulhu)
Compatible avec plusieurs modèles IA au choix (ChatGPT, Claude, Gemini, DeepSeek), pas de fournisseur imposé
Cons
Projet très jeune (0 étoile GitHub sur les deux dépôts), maintenance long terme non garantie
Nécessite de fournir sa propre clé API et d'accepter une installation/configuration technique
Aucune licence officielle spécifiée sur le dépôt, statut d'utilisation flou au-delà du perso