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

# One backend, many apps

> Apps built on Unpod - each one uses the same six layers underneath.

Unpod is infrastructure, so the products built on it differ: a contact
center, a personal assistant, an email-first agent. Underneath, every one
of them uses the same six layers.

Your applicationActionsYour APIs · webhooks · SheetsAgentsHarness · tools · flows · human handoffContext EnginePeople · history · knowledge · outcomesModelsSTT · TTS · LLM · failoverChannelsCall · chat · WhatsApp · SMS · emailTelephonyNumbers · SIP · PSTN · media

## The gallery

> **[Unpod Platform](https://docs.unpod.ai/platform/introduction.md)**
>
> Our own product - Studio, Spaces, calls and analytics - built on this
> backend. App number one.

> **[Contact center](https://docs.unpod.ai/apps/contact-center.md)**
>
> **Runnable today.** One prompt, fifty calls, one report - with a handoff
> to a human when it matters.

> **[Personal assistant](https://docs.unpod.ai/apps/personal-assistant.md)**
>
> **Illustrative.** The agent is the interface, and it remembers the user
> from last time.

> **[Email-first agent](https://docs.unpod.ai/apps/email-first-agent.md)**
>
> **Illustrative.** An agent that lives in the inbox and calls when a
> conversation needs a voice.

**Runnable** means every step on the page works today. **Illustrative**
means the page shows the design; it lists what the app waits on and what
you can build today instead.

## Which layers each app uses

| Layer | Contact center | Personal assistant | Email-first agent |
| - | - | - | - |
| Telephony | Yes | Yes | For the call step |
| Channels | Voice | Voice, chat, WhatsApp\* | Email\*, voice |
| Models | Yes | Yes | Yes |
| Context Engine | Per call | Across channels\* | Across channels\* |
| Agents | Yes | Yes | Yes |
| Actions | Sheets, webhooks | Your APIs | Your APIs |

\* In build - each app page says what it waits on.


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