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

# Personalization Overview

> How ZeroTwo learns your preferences and adapts to how you work.

ZeroTwo offers three layers of personalization that work together to make every conversation feel like it was built for you. You don't have to configure anything to get started — Memory is on by default and begins working immediately.

## The three layers

| Layer                   | What it does                                                                                                    | Where to set it                                  |
| ----------------------- | --------------------------------------------------------------------------------------------------------------- | ------------------------------------------------ |
| **Memory**              | ZeroTwo automatically learns facts about you from your conversations and uses them in future chats              | Settings → Personalization → Memory              |
| **Custom Instructions** | You explicitly tell ZeroTwo who you are and how you want it to respond — applied to every new chat              | Settings → Personalization → Custom Instructions |
| **Preferences**         | Controls defaults: which model is pre-selected, which tools are always on, your preferred voice, agent behavior | Settings → Preferences                           |

## How the layers work together

The three layers stack to create a full personalization profile:

1. **Memory** contributes background context — your role, projects, habits, and preferences ZeroTwo inferred from your conversations
2. **Custom Instructions** set explicit rules — tone, format, language, and background you want ZeroTwo to always know
3. **Preferences** define defaults — the model, tools, and voice that are active when you start a new chat

When you start a new conversation, ZeroTwo combines all three layers to shape its initial behavior. Anything you specify directly in the chat always takes priority over all three layers.

<Info>
  Custom Instructions and Memory are applied at the start of new chats. They are not retroactively applied to existing conversations.
</Info>

## Access personalization settings

All personalization settings live in **Settings → Personalization**:

* **Memory** — view, edit, delete memories; toggle memory on/off
* **Custom Instructions** — set your background and response preferences
* **Theme** — Light / Dark / System
* **Language** — choose from 11 supported languages

**Settings → Preferences** covers model defaults, tool defaults, voice selection, and agent confirmation behavior.

## Personalization and privacy

* Memories are stored per-account and are never shared with other users
* Custom Instructions are private to your account
* Memories are not used to train ZeroTwo's underlying models
* On Business plan, org admins may have visibility into account data per your organization's policy

## Get started

<CardGroup cols={2}>
  <Card title="Memory" icon="brain" href="/personalization/memory/what-is-memory">
    How ZeroTwo automatically learns from your conversations
  </Card>

  <Card title="Custom Instructions" icon="wand2" href="/personalization/custom-instructions">
    Set explicit instructions that apply to all new chats
  </Card>

  <Card title="Theme & Language" icon="palette" href="/personalization/theme-and-language">
    Appearance and interface language settings
  </Card>

  <Card title="Preferences" icon="settings" href="/personalization/preferences">
    Default model, tools, voice, and agent behavior
  </Card>
</CardGroup>