# Thermals — Is your phone throttling? > App monitors iPhone thermal state, processor activity, and uptime. (iPhone/iPad app by George Garside.) - Source: https://appshunter.io/ios/app/thermals/id1567050762 (this page in markdown: same URL + `.md`) - Developer: [George Garside](https://appshunter.io/developer/815604170) - Category: Developer Tools, Utilities - Price: Free - Rating: 4.50/5 from 26 App Store ratings · 29 written reviews indexed - Age rating: 4+ - Requires: iOS 26.0 · 3 MB - Languages: American English - Released: 2022-12-28 - Data updated: 2026-08-26 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/thermals/id1567050762/reviews.md ## What is Thermals? Phone running slowly, charging slowly or low brightness? See if your device is overheating using Thermals. Thermals displays your device’s thermal state, as well as how many processors are active on your device and its uptime, as reported by iOS. Thermals helps troubleshoot: • Poor performance — iOS reduces processor speed and potentially disables processors temporarily when the device is hot. • Slow charging — battery charging causes a lot of heat and iOS can limit charging speed to reduce the additional heat that might make a device too hot. • Low maximum brightness — if your device screen stays dark despite being on full brightness, it could be limited by iOS due to heat. • Manufacturing defects — if not all processors are active when the device is cool and not in low power mode. Your device's thermal state is monitored regularly in the background and recorded in the app (if Background App Refresh is enabled). Open the app or tap the widget to record a data point manually. Export the raw data to file for corroboration with Screen Time, Xcode's Instruments, or other development tools. Also an independent Apple Watch app shows the thermal status, active processors and uptime, and thermal history of your watch. ## Key features - 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 ## Chart rankings - #133 in Top Free · Developer Tools (US App Store) ## Recent user reviews (10 of 29) All indexed reviews: https://appshunter.io/ios/app/thermals/id1567050762/reviews.md ### 5/5 — Beautiful app *2026-08-08, version 1.0.1* So simple and hassle free. Love it. ### 5/5 — Great app *2026-08-06, version 1.0.1* That’s a real good app free for all ❤️ ### 1/5 — Thermals not working *2026-08-04, version 1.0.1* Was great app for iPhone and Apple Watch but since updating to watch os 26.6 it no longer opens app just crashes, disappointing. ### 4/5 — Great *2026-06-26, version 1.0.1* Great app the seconds and time since start up countdown like backwards ### 5/5 — Brilliant *2026-06-06, version 1.0.1* 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. ### 5/5 — Great app !! *2026-05-19* One minor thing noticed: Feels like sometimes widget does not refresh automatically with reference to current thermal state of device. We need to tap on widget then it switches to latest state and stay in this unless tapped again. Maybe incorrect but if dev can confirm. ### 5/5 — Exactly what I wanted! *2026-05-08, version 1.0* This is exactly what I wanted, easy to see the status of my phone without the stupid in-app purchases just to see the temperature as a widget. Love the minimalist design! ### 5/5 — Amazing app! *2026-04-19, version 1.0* Helps me keep track of my iPhone and if it was overheating or something happened at any time, great freaking app! No ads, great service! ### 5/5 — Absolutely GREAT *2026-04-12* Records everything. Lets me see what causes it and learn. 10/10 helpful. Thanks. Also ps the widget stops at 50mb data ### 5/5 — Очень хорооо *2026-03-06* Отличное приложение, очень трудно отыскать что то из такого спектра для айфона, но найдя это приложение я не пожалел - изначально скачивал проводя тесты самодельной системы охлаждения, теперь пользуюсь и в обычное время) ## Frequently asked questions about Thermals ### 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. ## Version history (last 2 releases) ### 1.0.1 — 2026-05-20 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. ### 1.0 — 2022-12-28 No release notes. ## More apps by George Garside - [Thomas Deacon Academy](https://appshunter.io/ios/app/thomas-deacon-academy/id686681384) - [Bluetooth Inspector](https://appshunter.io/ios/app/bluetooth-inspector/id1509085044) - [Lighthouse Score](https://appshunter.io/ios/app/lighthouse-score/id1551494625) - [Accessibility Inspector](https://appshunter.io/ios/app/accessibility-inspector/id1555847137) - [Arrowed](https://appshunter.io/ios/app/arrowed/id1567979689) All apps by George Garside: https://appshunter.io/developer/815604170 ## Related topics [cool down phone](https://appshunter.io/ios/topics/cool-down-phone) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*