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Thermals

Thermals

Is your phone throttling?

26 ratings
29 reviews
#133 in free Developer Tools
🔧 Utilities
🛠️ Developer Tools
Free

Details

  • Released
  • Updated

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. 133
Charts↘︎
⭐29
Reviews↘︎
📝1+ tags
Tags↘︎
❓8 answered
FAQ↘︎
📦~ in 3 years
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

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

1.0.1

May 20, 2026

Features: • Migrate history data to SwiftData, improving performance for large history and reliability of widgets. Fixes: • Fix export button not appearing on the history view. • Fix rare crash caused by text concatenation.

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Charts

Top Free

📈 133+19

Developer Tools

This app rose +19 positions in Developer Tools chart.

Last updated on August 29, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Beautiful app

So simple and hassle free. Love it.
Skye_God’sDaughterSkye_God’sDaughter

Great app

That’s a real good app free for all ❤️
Rifat uddinRifat 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.
11JJ78911JJ789

Great

Great app the seconds and time since start up countdown like backwards
D9REDDERZD9REDDERZ

Brilliant

As a developer, I appreciate an app that is so functional yet so small (less than 1 MB). We need more utilities like this. Also, the UI is great for someone who doesn’t understand what’s too hot or too cold.
Caracci4545Caracci4545
See 24 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.