> For the complete documentation index, see [llms.txt](https://docs.humblytics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.humblytics.com/understanding-your-data/understanding-devices-data.md).

# Understanding Devices Data

See which operating systems, device types, and browsers your visitors use, so you know where to design and test first.

Go to **Observe → Analytics → More → Devices**.

## Summary metrics

| Metric              | What it means                                                                  |
| ------------------- | ------------------------------------------------------------------------------ |
| **Unique Visitors** | Different people in the selected dates.                                        |
| **OS**              | How many operating systems were detected.                                      |
| **Devices**         | How many device types were detected (for example desktop, mobile, and tablet). |
| **Browsers**        | How many browsers were detected.                                               |
| **Top OS**          | The most common operating system.                                              |

A donut chart shows your visitors' operating system mix at a glance.

## Tabs

* **OS:** Mac OS X, Windows, iOS, Android, and others.
* **Device:** desktop, mobile, and tablet.
* **Browser:** Chrome, Safari, Firefox, Edge, and others.

Each table shows **Unique Visitors** and **Share** (percent of the total), with a search bar.

## What to do with it

* **Mostly mobile?** Review your pages on a phone first and compare mobile and desktop [heatmaps](/understanding-your-data/understanding-heatmap.md).
* **Test where your visitors are.** Check new pages in your top two or three browsers before you launch.