> ## Documentation Index
> Fetch the complete documentation index at: https://docs.base44.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Base44 actors

> Base44 realtime actors: stateful server rooms over WebSockets (Durable Objects) under base44/actors/<Name>/entry.ts for multiplayer, collaborative boards, presence, live cursors, chat rooms and auctions, with the actor contract, rules and the React client. Use when users interact live in one shared session.

> [!WARNING]
>
> This page is part of an AI coding agent skill and is written for agents, not humans. For the human-readable Base44 docs, see the [developer documentation](https://docs.base44.com/developers).

# Base44 actors

One actor instance per room id; the actor is authoritative, clients send operations. Writing the entry file deploys the actor.

> **Requires the Builder plan or above.** The workspace's entitlement is reported by the agent-profile endpoint; on a lower plan the platform rejects the deploy.

## Pick the reference for this app

Determine the app profile first. Call `GET /api/apps/{app_id}/agent-profile` (over the Base44 MCP `execute_api`
tool, or with your Base44 CLI token); it returns the framework, app type, runtime,
entitlements and the exact reference files to read. Without it, detect from the project files:
`src/routes/__root.*` and `src/routeTree.gen.ts` mean TanStack Start; `app/_layout.*` means a
native mobile (Expo) app; otherwise it is a Vite SPA.

| Profile | Read |
| - | - |
| Web app, Vite SPA (the default web template) | [Realtime actors (web apps)](https://docs.base44.com/developers/skills/base44-platform-actors/references/web.md) |
| Web app, TanStack Start | [Realtime actors (web apps)](https://docs.base44.com/developers/skills/base44-platform-actors/references/web.md) |
| Native mobile app (Expo, React Native) | [Realtime actors (mobile apps)](https://docs.base44.com/developers/skills/base44-platform-actors/references/mobile.md) |


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