AI dungeon master

Yes, an AI can run a D&D game, and it does well in short sessions. It describes scenes, plays the non-player characters (NPCs), and answers anything that you type. In long campaigns, it forgets facts, bends the rules, and lets you win too easily.

You have two ways to play with an AI dungeon master (DM):

• A dedicated tool. Friends & Fables, AI Realm, AI Dungeon, and the AI Game Master app give you a game that is ready to play.
• A general chatbot. ChatGPT, Claude, or Gemini can run a game if you give it a good setup prompt and keep your own notes.

Players say the same thing again and again. The AI is a good storyteller for a session or two. It is not yet a good DM for a campaign of months. This guide shows each tool, how to set up a chatbot, and what goes wrong.

You read this on the LifeSim blog. LifeSim is our game, and it is not a D&D tool. We say where it fits at the end, and where it does not.

We checked each of these tools on its own site in November 2026. Friends & Fables and AI Realm follow the D&D 5e rules most closely. AI Dungeon gives you the most freedom and the least structure.

Friends & Fables: the closest to a real D&D table

Friends & Fables runs in the browser at fables.gg. Its AI game master has the name Franz. The site says Franz narrates the story, applies the rules, and responds to the world. Combat is turn-based and uses D&D 5e rules.

A party can have up to six players, and the players can take turns at different times. The site also gives you tools for maps, lore, quests, and NPCs. It uses material from the System Reference Document (SRD 5.1). We wrote a full review: Friends & Fables.

AI Realm: solo 5e adventures in the browser

AI Realm calls itself “the ultimate AI-powered RPG platform for playing D&D 5e inspired adventures.” Its AI game master runs the story and the combat. It makes character portraits and tracks your campaign for you. The site says it uses content from the D&D 5e SRD (2014).

AI Realm runs in a browser, and you can install it as an app on a phone or tablet. The reviews on its site describe solo play. We did not find a clear statement about group play.

AI Dungeon: free-form text adventures

AI Dungeon calls itself a “free AI text adventure game.” You start a fantasy quest, build your own scenario, or play an adventure that another player made. It runs in a browser and in an app. Its home page does not mention D&D rules or dice. For a full look, read our AI Dungeon comparison.

AI Game Master – Dungeon RPG: an iPhone app

Digital Dynasty Entertainment makes this app for iPhone and iPad. You type your actions, and the AI game master builds the story around them. It covers fantasy, horror, sci-fi, and anime stories, with companions, quests, and combat. It is not a D&D rules tool.

None of these tools is official D&D. Friends & Fables and AI Realm both say that they are not affiliated with Wizards of the Coast.

Plans and prices change, so we left out the prices. Check each official page before you pay.

Yes. A general chatbot such as ChatGPT, Claude, or Gemini can run a D&D game for one player. It needs clear rules from you at the start. It also needs your notes, because its memory of a long chat is not reliable.

The biggest problem in early tests was control. In April 2023, Brian Childs tested ChatGPT as a DM for Fortune. The chatbot sometimes wrote his character’s actions for him. It also pushed the plot hard and gave him little room to act. The setup below helps to stop these problems.

How to set up a chatbot as your DM

1. Start a new chat, and use it only for this campaign.
2. Paste a setup prompt. For example: “You are the dungeon master for a solo D&D 5e game. Describe the scene, play every NPC, and then stop and ask what I do. Never decide what my character says or does. When a check is necessary, tell me the die and the DC, and wait for my roll. Let me fail. Keep each reply under 200 words.”
3. Paste your character sheet: class, level, hit points (HP), abilities, spells, and items.
4. Give the setting in two or three sentences, and say the tone that you want, such as grim, funny, or heroic.
5. Roll real dice, or a dice app, and type the result. Keep your HP and items in your own notes.
6. Correct the DM at once when it makes a mistake. Say the correct fact in one sentence.
7. At the end of each session, ask for a summary of the NPCs, places, quests, and loot. Correct the summary and save it in a file.
8. At the start of the next session, paste the setup prompt and the saved summary into a new chat.

One player on the EN World forum uses a similar method for long games. In June 2026, that player described a set of files for NPCs, factions, and maps. The AI reads only the files that the scene needs, so it has less text to remember.

Players report three main problems: memory, rules, and consistency. These reports come from players who used the AI for more than a few sessions.

Memory: NPCs and facts disappear

In a June 2026 EN World thread about AI GMs, one player said an AI DM “works great for a session or two.” After that, earlier NPCs “quietly stop existing.” Another player wrote, “As a dialogue gets longer, they seem to lose the thread.” A third player switched from ChatGPT to Gemini because, for them, Gemini kept a better long-term memory.

The tools try to fix this. Friends & Fables keeps stats, places, and quests in a game database. Its blog says a chatbot keeps its memory as plain text, so its facts become less accurate over time. AI Dungeon gives each player a memory bank, and the paid tiers make it larger.

Rules: dice, combat, and balance

In the same thread, a player said the AI fudged rolls so that bad things did not happen. In a 2024 reply on EN World, a player said the AI lost track of details when combat with initiative started. The same AI also suggested a dragon fight for a level 1 party.

Consistency: the AI agrees with you too much

One EN World player named the bias to “give the user what they want.” A human DM says no when the story needs it. An AI DM often says yes, so the danger goes away. Childs, in his Fortune test, said the game felt like “watching the same magic trick over and over again.”

The case against AI DMs

Some players do not want an AI at the table. In Typebar Magazine, in July 2026, Leonardo Andrade wrote that “LLMs do not understand anything, have no taste.” He says that players who write their own stories become better players and better DMs.

An AI DM works best for solo play. Most tools above are made for one player, and a chatbot handles one player more easily than five.

Childs, in his Fortune test, gave the main reason. He said the social, shared time is the real value of D&D, and an AI cannot give you that. He expected an AI DM to appeal to solo players and to people who cannot find a group.

For a group, Friends & Fables is the tool to try. It supports a party of up to six players, and the players can take their turns at different times. Childs saw another use: a human DM runs the game, and the AI writes the dull parts, such as descriptions of a place.

For other AI story games that you play alone, read our guides to AI roleplay, text-based games, and story games.

Yes. Each tool above has a free way to start, but the free versions have limits. The paid plans give more turns, larger models, or more memory.

• Friends & Fables has a free plan with a limit of 25 turns a day. A turn is one reply from Franz. The three paid plans, Starter, Pro, and Legend, give unlimited standard turns.
• AI Dungeon has a free tier with 25 memories and a short context. The context is the amount of recent text that the AI reads. The paid subscriptions add more models, a longer context, and a larger memory bank.
• AI Realm says that you need no credit card to start. We did not find its plan details on the home page.
• AI Game Master – Dungeon RPG is free to download, with in-app purchases for more turns.

Prices change, so check each official page before you pay. For a chatbot, check the plan page of the chatbot for its limits.

Wizards of the Coast does not let its own creators use generative AI for final D&D products. It said this in an “Updated Statement on AI” on D&D Beyond on December 19, 2023.

The statement says that Wizards requires its artists, writers, and other creators “to refrain from using AI generative tools to create final D&D products.” It also says, “we believe those people are what makes D&D great.”

The statement is about the official books and art. It does not talk about players who use an AI DM at home. The tools in this guide are not official D&D products.

No. LifeSim is our game, and it is not a D&D tool. It has no dice, no classes, no spells, and no combat rounds. If you want a D&D campaign, use Friends & Fables, AI Realm, or a chatbot with the setup above.

LifeSim fits a different player: a player who wants AI characters that remember you, in a life that continues. You pick any city on a real 3D map of Earth. The people there are AI characters with jobs, homes, and friends. They answer in their own words, and they remember what you said.

A life in LifeSim runs a day at a time, on its own clock. It is free to play, with no ads, no subscription, and nothing to buy. It runs in any browser at play.lifesim.com and on iPhone and iPad. Read how to play LifeSim for the details.

For more games where AI characters talk back, see games where you can talk to AI and the best AI chatbots for roleplay.

Which one should you pick?

• You want D&D 5e rules with a group: try Friends & Fables.
• You want solo 5e adventures in a browser: try AI Realm.
• You want a story with no rules at all: try AI Dungeon.
• You want full control and already use a chatbot: use ChatGPT, Claude, or Gemini with the eight steps above.
• You want AI characters who remember you in an everyday life, with no dice: try LifeSim.

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• Friends & Fables: official site
• Friends & Fables: pricing
• Friends & Fables blog: How is Friends & Fables different from ChatGPT, AI Dungeon or NovelAI?
• AI Realm: official site
• AI Dungeon: official site
• AI Dungeon help: Memberships & Benefits
• AI Game Master – Dungeon RPG on the App Store
• Fortune: D&D with ChatGPT as the dungeon master (April 2023)
• EN World forum: AI GMs (June 2026)
• EN World: RPG Evolution: The AI DM in Action
• Typebar Magazine: ChatGPT, LLMs, and Automating the Fun Out of Roleplaying (July 2026)
• D&D Beyond: Updated Statement on AI (December 2023)