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

# Key concepts

> The words Noodle uses — Noo, journals, check-ins, prompts, and more.

These terms appear across the app. Using them consistently makes the rest of the docs easier to follow.

| Term                     | Meaning                                                                            |
| ------------------------ | ---------------------------------------------------------------------------------- |
| **Noodle**               | The product — your private journal and companion app.                              |
| **Noo**                  | The AI companion you chat and (on Noodle+) talk with.                              |
| **Journal**              | Your writing space. Entries live inside **Journals** (named containers).           |
| **Entry**                | A single journal write-up.                                                         |
| **Chat**                 | A conversation thread with Noo.                                                    |
| **Check-in**             | A quick mood log (Rough → Great), with optional metrics and tags.                  |
| **Prompt**               | A writing starter from Noodle or the community.                                    |
| **Reflection**           | A short AI note on a line or passage in an entry.                                  |
| **Insights**             | Gentle pattern summaries — writing, mood, themes — without scores or streaks.      |
| **Calendar**             | A time-based view of your activity.                                                |
| **Personality**          | How Noo sounds (for example Friendly or Candid).                                   |
| **Therapeutic approach** | The modality that shapes Noo's style (for example CBT-informed, ACT, mindfulness). |
| **Intention**            | What you said brings you to Noodle (set in onboarding; editable later).            |
| **Tags**                 | Labels you attach to check-ins or entries.                                         |
| **Noodle+**              | The paid plan for unlimited chat, history, and voice.                              |

## Mood scale

Check-ins use five labels:

**Rough → Low → Okay → Good → Great**

Optional metrics can include Energy, Pain, Sleep, Stress, Focus, Anxiety, Motivation, Social, and Appetite. You control which metrics appear in **Settings**.

## What stays private

Your chats, journal entries, and check-ins are for you. See [Privacy & data](/account/privacy) for how we handle data, and [Export your data](/account/export) if you want a copy.