Thermals vs Dev Utils
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Thermals
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
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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.
Dev Utils
This app provides mobile developers with essential tools to streamline their workflow. It offers timely notifications for OS and Xcode releases, accessibility features, device information, and a reference for HTTP status codes. Customize your experience with themes and app icons.
- OS and Xcode release notifications
- System font and color comparison
- Device information lookup
- HTTP status code reference
- Light/dark themes
- Customizable app icons
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Dev Utils is the ultimate toolkit for mobile developers. With features designed to streamline your workflow and increase productivity, Dev Utils is the essential companion for building amazing mobile apps. Stay Up-to-Date with the Latest Releases and Betas - Get notified about the latest betas and full releases of Apple's operating systems (iOS, iPadOS, watchOS, and tvOS) and Xcode. - Easily check release notes for the latest Xcode. See the macOS requirements and view included SDKs for iOS, macOS, watchOS, and tvOS. - Stay informed with the latest developer news and important information about App Store Connect, TestFlight, and more. Ensure Your App is Accessible to All Users - Compare system fonts and colors with adjustable sizing and dark mode support. Get Device Information Quickly and Easily - Check which versions of Apple's operating systems (iOS, iPadOS, watchOS, and tvOS) are currently supported on any device. - Quickly view your device's type, storage, connectivity, cameras, and more. Easily share device info with others. Additional Tools - Quickly search and learn about HTTP status codes with a comprehensive reference guide. Customize Your Experience - Enjoy light and dark themes and customize your home screen with alternate app icons. Download Dev Utils now and elevate your mobile development to the next level!
Screenshots
Verdict
The clearest difference is rating: Dev Utils at 4.7 against Thermals's 4.5. Dev Utils also leads on review sentiment (92% vs 83%) and ratings volume (101 vs 28). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Dev Utils holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 28 and 101 respectively. Written reviews point the same way: 83% of Thermals's written reviews are positive against 92% of Dev Utils's.
Thermals ships an update every 3 months, Dev Utils every 4 months. The most recent releases landed on September 27, 2026 and September 28, 2026 respectively.
| Parameter | Thermals | Dev Utils |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (28 ratings) | 4.7 (101 ratings) — better |
| Positive reviews | 83.3% of reviews | 92.5% of reviews — better |
| Number of ratings | 28 | 101 — better |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | #198 — better | #203 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 18.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | George Garside | Ryan Fielder |
Customer experience
Thermals
Dev Utils
Bugs and requests
Thermals
Not enough reviews yet to summarise bugs or requests.
Dev Utils
Reported bugs
5 issues- Unknown errors
- Find my iPhone error
- Apple ID locked
- Privacy concerns
- Being attacked
Requested features
6 requests- Update release notes/version numbers
- Adapt to iOS 26 and dark icon
- Update data promptly
- Allow development usage
- More access to watch design UI
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- Enable installation on Mac M series
In-app purchases
Thermals
No in-app purchases
Dev Utils
No in-app purchases








