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Thermals

Thermals

Is your phone throttling?

30 ratings
30 reviews
#172 in free Developer Tools
🔧 Utilities
🛠️ Developer Tools
Free

Details

Released
December 28, 2022
Updated
September 16, 2026

Features

Developer

George Garside
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Thermals screenshot #1 for iPhone
Thermals screenshot #2 for iPhone
Thermals screenshot #3 for iPhone
Thermals screenshot #4 for iPhone
iphone
ipad
watch
📉no. 172
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⭐30
Reviews↘︎
📝2+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓8 answered
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📦~ in 3 months
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About

Monitor your device's thermal state and processor activity to diagnose performance issues. Understand why your phone might be running slowly, charging slowly, or have reduced brightness due to overheating. Export data for further analysis with other development tools.

✓Displays device thermal state
✓Shows active processor count
✓Monitors device uptime
✓Troubleshoots performance issues
✓Helps diagnose slow charging
✓Identifies brightness limitations
✓Exports raw data for analysis
Show original description

What's New in Thermals

1.0.3

September 16, 2026

Fixes: • Fix Apple Watch crash on launch

Charts

Top Free

📉 172-10

Developer Tools

This app dropped -10 positions in Developer Tools chart.

Last updated on October 30, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Beautiful app

So simple and hassle free. Love it.
SSkye_God’sDaughter

Great app

That’s a real good app free for all ❤️
RURifat uddin

Thermals not working

Was great app for iPhone and Apple Watch but since updating to watch os 26.6 it no longer opens app just crashes, disappointing.
111JJ789

Response from developer

The Thermals app on Apple Watch has been fixed in version 1.0.3, please update. Thanks for using Thermals!

Sympa mais..

J’ai trouvé l’info utile mais plutôt qu’un logo pourquoi pas une indication claire et précise de la température sous forme par exemple d’un thermomètre avec une jauge ??

En plus le code couleur ne veut rien dire 🤨
BBipbip-fresh

Great

Great app the seconds and time since start up countdown like backwards
DD9REDDERZ

Response from developer

Oops, fixed in version 1.0.2, thanks for using Thermals!

See 25 more reviews

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FAQ

How does Thermals help with slow performance?

Thermals displays your device's thermal state. When an iPhone overheats, iOS can reduce processor speed to prevent damage, leading to poor performance. This app helps you identify if heat is the cause.

Can Thermals help diagnose slow charging?

Yes, Thermals can help. Battery charging generates heat, and iOS may limit charging speed to manage this heat. By monitoring thermal state, Thermals can indicate if overheating is impacting your charging speed.

What does Thermals show about my iPhone's processors?

Thermals shows how many processors are currently active on your device, as reported by iOS. This can be useful for diagnosing manufacturing defects if not all processors are active when the device is cool.

How often does Thermals monitor my device?

Thermals monitors your device's thermal state regularly in the background if Background App Refresh is enabled. You can also open the app or tap the widget to record a data point manually.

Can I export data from Thermals?

Yes, Thermals allows you to export the raw data to a file. This data can be used for corroboration with other development tools like Screen Time or Xcode's Instruments.

Is Thermals available on Apple Watch?

Yes, there is an independent Apple Watch app for Thermals. It shows the thermal status, active processors, uptime, and thermal history of your watch.

What is the age rating for Thermals?

Thermals has an age rating of 4+. This indicates it is suitable for a wide range of users and does not contain mature content.

When was Thermals last updated?

Thermals was last updated on December 28, 2022, with version 1.0. This indicates it is a relatively new application.