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

# Hosted and open source

> Choose between the hosted Celesto Platform and Celesto's open-source projects: SmolVM, SmolFS, and Agentor.

Celesto is both a hosted platform and an open-source stack. The hosted platform gives you managed agent computers through an API. The open-source projects let you run, inspect, and extend the building blocks yourself.

Use the hosted platform when you want to ship quickly. Use the open-source projects when you want local control, deeper customization, or a self-managed runtime.

## Choose the hosted platform

Hosted Celesto is the fastest path when your product needs managed computers for agents:

* create computers from SDKs or the CLI,
* run commands and publish ports,
* keep durable state across sessions,
* deploy agents without managing VM infrastructure,
* integrate with OpenAI agent sandbox flows.

<Card title="Celesto Platform" icon="cloud" href="/celesto-sdk/overview">
  Start with hosted Celesto computers from Python, TypeScript, JavaScript, or the CLI.
</Card>

## Choose open source

The open-source stack is useful when you want to run locally, inspect internals, or build your own agent runtime.

<CardGroup cols={3}>
  <Card icon="computer" title="SmolVM" href="/smolvm/introduction">
    Open-source microVM sandboxes with fast boot and hardware-level isolation.
  </Card>

  <Card icon="folder-open" title="SmolFS" href="/smolfs/overview">
    Durable workspace folders that agents can close and reopen across runs.
  </Card>

  <Card icon="robot" title="Agentor" href="/agentor/home">
    Build agents with tool use, MCP, and agent-to-agent communication.
  </Card>
</CardGroup>

## You can mix both

Many teams use local SmolVM during development and hosted Celesto in production. The core idea stays the same: agents work inside computers, not on your app server.