# Compare Two NotebookLM Notebooks


Compare Notebooks puts two Gemini Notebook (formerly NotebookLM) notebooks side by side. You see the sources they share in green and the sources only one has. Then you can add the missing ones, sync them or merge them.

**This needs Kortex Pro.** See [pricing](https://www.kortex-notebooklm.com/#pricing).

<img src="/docs/img/docs/shot-dashboard-compare-notebooks.webp" alt="Two notebooks compared side by side" width="720" />

## Why compare notebooks?

It is like laying two shopping lists next to each other. You see at once what is on both and what is missing from one.

## How to compare

1. Click **Compare** in the sidebar. Or tick two notebooks in [All Notebooks](/docs/all-notebooks) and click **Compare** in the bar.
1. Pick two notebooks.
1. Click **Compare Selected**.

## What you see

- For each notebook: how many sources, tags and collections it has.
- Sources both notebooks have are in green.
- A button for each notebook says how many sources it is missing, for example **Add 6 missing source(s) to this notebook**.
- Tags and collections side by side. It says **Tags in sync** when they match.

## What you can do

- **Sync All**: make the two notebooks match.
- **Merge into New**: put both into a new notebook.
- **Export Diff**: save the differences.
- **Change Selection**: choose another pair.

:::tip Good to know

- Sync All changes the notebooks, so look at the two sides before you click it.

:::

## Can I sync tags and collections too?

Yes. Besides **Sync All**, the page has **Sync tags** and **Sync collections**. **Merge into New** puts both notebooks into a new one, and **Export Diff** saves the differences. Compare needs Kortex Pro, while [Merge Notebooks](/docs/merge-notebooks) has 3 free merges on the Basic plan.

## Related pages

- [Merge Notebooks](/docs/merge-notebooks)
- [All Notebooks](/docs/all-notebooks)