---
title: "System requirements"
description: "Devices and browsers for participants, operators and admins."
---

> eSSESSMENT docs. Web page: https://presagetech.com/docs/essessment/requirements
> Index of all pages: https://presagetech.com/docs/essessment/llms.txt

# System requirements

## Device requirements

To complete camera-based activities in Coherence, use a phone or tablet with a front-facing camera and a supported operating system:

<div class="tw">

| Platform | Requirement |
| --- | --- |
| iPhone and iPad | iOS or iPadOS 17 or later |
| Android | Android 9 (API 28) or later. See the [supported devices](https://smartspectra.presagetech.com/docs/android/#supported-platforms). |
| Camera | A front-facing camera |

</div>

Reliable measurements also depend on camera performance. The device should keep about 25 frames per second or higher during a capture, and 30 fps is recommended. A supported operating system alone doesn't ensure reliable capture.

## Before you begin

Choose a well-lit space, keep your face clearly visible, and follow the on-screen guidance. For breathing measurements, rest the device on a stable surface with your face and chest in view. For more tips, see [Getting a good measurement](https://smartspectra.presagetech.com/docs/measurement-quality/).