Thermals

Monitor your device's thermal state and heat-related constraints.

Thermals: live thermal state with a gauge and recommendations

Overview

The Thermals tool helps you understand when your device is getting hot and whether iOS is applying thermal limits that can reduce performance.

Table of Contents

• Overview
• Main Sections
• Thermal States
• Notes And Limitations

Main Sections

Thermals is a single scrolling screen with:

• A hero gauge that visualizes the current thermal state and a percentage-style level.
• A thermal stack that highlights the current state across Nominal, Fair, Serious, and Critical.
• A Current State card.
• A Recommendation card with guidance based on the current thermal state.

Details and recommendations update with thermal state

Thermals is a single screen you can scroll

Thermal States

Lirum uses iOS thermal states:

• Nominal: normal operating temperature.
• Fair: warming up.
• Serious: performance may be reduced.
• Critical: the system may take aggressive measures to cool down.

What You Can See

• Thermal state (for example: nominal, fair, serious, critical)
• Indicators that performance may be reduced due to heat (device/OS dependent)
• Related context from other tools (CPU usage, charging, background activity)

Notes

• Available thermal details vary by device model and iOS version.
• Sustained high CPU/GPU load, charging, direct sunlight, and poor ventilation can trigger thermal limits.

Notes And Limitations

• Thermals reports the system thermal state, not a physical temperature sensor reading.