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# Set up a Comparison page to compare regions or products

> Add a Comparison page to a Mammoth dashboard to put two to four regions, products or teams side by side, and choose what readers can compare.
>
> Applies to: Roles: Anyone who can edit the dashboard. Where: Dashboard editor › Add › Page › Comparison

A Comparison page puts a column's values side by side, for example two regions, products or teams, with the leader marked. Readers can change what is compared while viewing. Anyone who can edit the dashboard can set one up in the dashboard editor.

## Add a Comparison page and open its settings

1. Add one with **Add** → **Page** → **Comparison**, or switch an existing page's structure to **Comparison**.
2. Open **Design** → **Format** → **Comparison settings…**, or click the compare bar on the canvas. The **Comparison** panel opens.
3. Choose the settings below.

## Comparison page settings

| Setting | What it does |
| --- | --- |
| **Starting view** → **Preset comparison** | You choose what readers see first. Set **Compare by** (a field, grouped into **Suggested** and **All fields**) and **Default subjects** (up to 4). Readers can change it while viewing, but their choice isn't saved. |
| **Starting view** → **Viewer chooses** | The page opens with a **Compare** button, and each reader picks the field and subjects themselves. |
| **Fields viewers can compare** | The fields readers are allowed to pick. |

Default subjects start as the top 2 values by the page's main metric. If fewer than two values qualify, the page opens as **Viewer chooses**.

## How readers change a comparison

1. Click **Compare** to open the dialog ("Pick a field, then the subjects to put side by side").
2. Choose a **Field**.
3. Choose up to 4 **Subjects**.
4. Click **Compare**.

Charts that can't be compared are hidden. The panel warns you, for example: "2 chart(s) on this page can’t be compared and will be hidden." See [Which charts work on a comparison page](https://mammoth.io/docs/learn/dashboards/charts/#which-charts-work-on-a-comparison-page).

## Limits for comparison pages

- Up to 4 subjects at once ("Up to 4 subjects").
- **Comparison settings…** only shows when the table has fields that can be compared.

## Related

- [Add pages to a dashboard](https://mammoth.io/docs/learn/dashboards/pages/): page types and structure.
- [Which charts work on a comparison page](https://mammoth.io/docs/learn/dashboards/charts/#which-charts-work-on-a-comparison-page): what the picker allows.
- [Filters](https://mammoth.io/docs/learn/dashboards/filters/): filters still apply on the page.

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Source: https://mammoth.io/docs/learn/dashboards/comparison-page.md · Updated: 2026-11-08