Thermals vs UXtweak
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
Read full descriptionHide full description
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.
UXtweak
Record your screen and voice while testing websites and apps to provide direct feedback. Answer questions about your user experience to help designers improve their products. Explore a sample study to understand the process.
- Record screen and voice feedback
- Answer experience-based questions
- Participate in mobile testing studies
- Test website and app usability
- Provide insights to designers
Read full descriptionHide full description
UXtweak's app for conducting usability testing studies. UXtweak is a powerful UX research platform offering tools for improving usability of web sites and apps, from prototypes to production. Provide useful insights to app and web designers directly from your iPhone! Record how you use their products, answer questions about your experience, and help make their apps and websites better and more UX friendly! Features - Record your screen (and your voice) while you use an app and provide instant feedback to the app (web) designer - Answer questions describing your experience with the tested app - Try out what a Mobile Testing study looks like through the Try example study function Note: this app is intended for use with UXtweak Mobile Testing, Website Testing and/or Prototype Testing study links. These links will be provided to you by the app designer, developer, or UX researcher. You can try out the functionality of this app by tapping the Try example study button on the app's homescreen.
Screenshots
Verdict
The clearest difference is update cadence: UXtweak at monthly against Thermals's every 3 months. UXtweak also leads on iOS requirement (14.0 vs 18.6). Thermals's advantage is chart position (#191 vs unranked). On price, review sentiment, 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.
Thermals ships an update every 3 months, UXtweak monthly. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.
| Parameter | Thermals | UXtweak |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (28 ratings) — better | — |
| Positive reviews | 83.3% of reviews — better | 80.0% of reviews |
| Number of ratings | 28 — better | — |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Best chart rank | #191 — better | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 18.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 77 MB |
| Age rating | 4+ | 12+ |
| Developer | George Garside | UXtweak j. s. a. |
Customer experience
Thermals
UXtweak
In-app purchases
Thermals
No in-app purchases
UXtweak
No in-app purchases









