Your AI co-pilot for Foundry VTT.

Familiar is an AI co-pilot for Foundry VTT, the virtual tabletop you run your D&D game in. You connect the AI you already use, such as Claude or ChatGPT, over the Model Context Protocol or an API key, and it runs the dungeon-master side of a published D&D 5e adventure you import: the rules, the dice, the monsters, and the NPC voices. You stay the player and keep the story; Familiar handles the table.

Yes. Familiar is an AI DM module for Foundry VTT: connect the AI you already use and take a seat as a player, while it runs the whole DM side of a published D&D 5e adventure you import, combat, dice, and NPC voices included. Bring Claude, ChatGPT, Gemini, Grok or Muse Code over MCP, or any of 31 providers by API key. You install it from the Foundry package browser or a manifest URL, and a subscription starts with 14 days free.

Read the setup guide

The rules it could cheat on, it cannot: dealing damage, dropping a condition, moving past a creature's speed, and faking a die roll all live in code the model does not control, and Foundry's own dice roll every result. The judgement calls, a flanking house rule or a narrative exception, stay yours, and any override the AI makes is written to the chat log. Where a rule is not modelled yet, Familiar flags it and leaves the ruling to you.

Read the combat guide

Two ways, and you bring your own AI for both. Use the Claude, ChatGPT, Gemini, SuperGrok or Muse Code plan you already have over the Model Context Protocol, and Familiar runs as an MCP server those clients connect to. Or paste an API key into the built-in chat, which also talks to a model you run on your own machine. The same tools work either way; the difference is where the model runs and who you pay.

Read the connect guideClaude in Foundry: Desktop or CodeChatGPT in Foundry via CodexGemini in Foundry via AntigravityGrok in Foundry via Grok BuildMuse Code in Foundry: one settings file

Yes, both paths. The built-in chat runs anywhere Foundry does, because the module calls your AI provider straight from the browser. MCP holds up too, and that link never leaves your desk: the server and the browser sit on the same machine, so your host never sees it. Run the setup wizard from the hosted game and it writes your game's URL into FAMILIAR_WS_ALLOWED_ORIGINS. There's nothing to hand-edit. Hosted play does put a few conditions on the MCP side, browser choice first among them.

Troubleshoot the MCP connection

No telemetry, no analytics, no profile of your table. Familiar runs inside your Foundry world, and your campaign leaves your machine only when you message the AI provider you chose. Table Chat starts switched on, so a player's @familiar message reaches that provider too, on your key, until you switch it off on the Chat tab. Two requests do leave on their own: a model-list refresh when a world loads, and a licence check that reaches Polar once a week. Neither one takes your campaign with it. Point the Local / Custom tab at a model on your own machine and even the provider traffic stops.

Read the local models guide

No. Familiar ships no game content at all: no adventures, no maps, no compendium packs, no stat blocks, no token art. It is software that connects your own AI to your Foundry world. At your table that AI improvises the chat replies, NPC voices, sound effects, music, images and video clips against your prompt, and what it makes lands in your world, yours to keep, edit or delete. The 5e rules Familiar enforces live in its code as names and numbers, never as copied rules text.

Familiar and Foundry's AI policy

Document updates are sanitised, so a routine edit can't reach ownership, permissions, or internal IDs. Anything destructive stops for your confirmation by default, and the WebSocket connection is authenticated with a shared secret. When an edit isn't what you wanted, /undo covers Familiar's changes to a sheet, a journal, a token, a scene or a playlist, coin and folder moves included, and an MCP client undoes through the same record. Not everything is on it. XP, conditions, damage or healing outside a combat action, a level-up, new art on a sheet, an item or a token it moved, and anything it created or deleted are among the changes it can't take back. Keep backups: good practice with or without AI.

Yes, with one boundary: the rules engine that referees combat is D&D 5e (2024) only. Everywhere else Familiar names your game system in its first reply and reads your world's own compendium instead of quoting D&D at you. The story, the NPCs, the scenes, the audio, and the campaign memory run there too.

See what runs on your system

Any current flagship from Anthropic, OpenAI, or Google handles tool-use best; see the "Choosing an AI model" guide for the named tiers. Bring whichever key or subscription you already pay for. Reasoning headroom is what carries a hard combat or a tangled scene. In the built-in chat, Thinking starts on High, and Medium is enough outside a hard fight. Over MCP that dial lives in your own client.

Yes, that's a main reason it exists, and how it started: 1-on-1 D&D with my wife. Most people who own Foundry are the GM, the one who never gets to play. Familiar runs the rules, the monsters, and the NPCs, and remembers your campaign across sessions, so you can take a seat at your own table, solo or one on one. Name your player login as the Solo Player and switch on Listen to the Solo Player, both on the Chat tab of Familiar's settings. Every plain line you type as that player then goes to Familiar, while your GM window stays open.

Read the solo play guide

No. Buy a Foundry-ready adventure (official D&D modules run about $20 to $30, with the maps and lighting already built), drop in a battlemap or two, enable Familiar, and you're playing. Familiar reads the adventure's journals so it knows the story you're about to discover, and pulls monsters and items from your compendia as you go.

Yes. On D&D 5e (2024) Familiar runs the DM's side (the rules, the monsters, every NPC), and it takes an ally's turn beside you too: a friendly NPC runs on auto-pilot like any monster, and you can hand it a full party character to play. In my own weekly campaign, Familiar has played two of the three heroes for months.

Yes, out of the box. Table Chat starts switched on, and Familiar posts a short how-to in the Foundry chat when the world loads and when you switch it on. A message starting with @familiar gets its answer in the same chat. Any NPC no player owns answers in character to its own @name as well, and that Any NPC switch is the one to turn off for a session where a name alone would give the plot away, because Familiar cannot keep a secret it can read. Pin an NPC on its sheet to keep it answering with the switch off, or to hand over a character a player owns. Everything runs in your browser, on your key, and you see every question and every answer. A player's own character follows the approval mode you set; anything wider waits for you, including anything that bills one of your AI providers, and a video clip is never made on a player's turn. The one exception is the answer itself: with a voice provider set, it is spoken on your key without asking, Familiar in your narrator voice and each NPC in its own, and the Table chat switch on the Voice tab turns that off. With no provider on the Chat tab, which is how most MCP setups run, questions wait in a table inbox until your Claude, Codex, Antigravity, Grok or Muse Code session checks the table. Name one player as the Solo Player and that seat plays by your own rules instead.

Read the solo play guide

Yes, in three layers. Your chat threads save as Foundry journals and reopen where you left them. In the built-in chat a bank of campaign facts is injected into every conversation, so what was true last week is still true tonight. A running plot summary carries the story itself. Open the journal called "[Familiar] Campaign Memory" in Foundry to read everything it has stored, and edit or delete anything that came out wrong.

Read the memory guide

$6 a month, $48 a year, or $99 once, and that is the whole price of Familiar. No tiers: every update is included, whichever way you pay. Both subscriptions start with two weeks free. Nothing is metered on our side, no credit balance, no per-message fee, no cap on how often you play. The AI itself is billed by your own provider at list price: a typical session runs $0.50 to $3 in API tokens, and each voice line, image, track or clip is billed on its own (the battlemap page keeps a dated list of image prices). Or no token bill at all: point the built-in chat at a model on your own machine, or drive Familiar over MCP from a Claude, ChatGPT, Gemini or SuperGrok plan or a Muse Code subscription.

Compare the two routes and what each costs

In the customer portal at familiarvtt.com/account. Polar handles the billing as merchant of record, so cancelling happens there: sign in with the email address you paid with. The same portal switches you between monthly and yearly, moves you to the lifetime licence, updates your card, and hands you your invoices. Cancelling takes effect at the end of the period you already paid for. If the portal does not recognise your email, ask in the Discord or mail support@familiarvtt.com.

Open your subscription page

Yes. AIs are poor at inventing a story, so Familiar doesn't ask them to. You bring a published adventure with its maps and NPCs, your AI reads it and runs it, and a human can take over anytime. Connect your own AI and it runs the whole DM side with a memory of your campaign across sessions.