# CORE Thermal Sensor vs SwimBETTER

The clearest difference is review sentiment: SwimBETTER at 100% against CORE Thermal Sensor's 19%. SwimBETTER also leads on rating (5.0 vs 2.5) and update cadence (monthly vs every 2 months). CORE Thermal Sensor's advantage is ratings volume (35 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SwimBETTER holds the better App Store score, 5.0 against 2.5. That said, the two scores are not equally well evidenced: CORE Thermal Sensor has 35 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 19% of CORE Thermal Sensor's written reviews are positive against 100% of SwimBETTER's.

CORE Thermal Sensor ships an update every 2 months, SwimBETTER monthly. The most recent releases landed on October 15, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | CORE Thermal Sensor | SwimBETTER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (35 ratings)](https://appshunter.io/ios/app/core-thermal-sensor/id1521866309/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/swimbetter/id1641229443/reviews)** |
| Number of ratings | **35** | 1 |
| Positive reviews | 18.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 55 MB | 29 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [greenteg AG](https://appshunter.io/developer/1510577388) | [eolab](https://appshunter.io/developer/1641229445) |

## What reviewers say

### CORE Thermal Sensor

[App page](https://appshunter.io/ios/app/core-thermal-sensor/id1521866309)

This app continuously monitors your core body temperature and thermal strain, providing critical data for heat training and optimal race performance. It helps athletes of all levels improve their training and achieve better results.

**Highlights:** Continuous core body temperature monitoring, Real-time Heat Strain Index, Heat Zones for training and racing, Heat Training Load and Adaptation Score, Passive heat training tracking, Data trends and historical analysis, Connectivity with sports devices

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### SwimBETTER

[App page](https://appshunter.io/ios/app/swimbetter/id1641229443)

Quantify your swimming technique with a palm-sized device that measures hand force in multiple directions. This innovative tool offers a game-changing approach to improving swimming performance directly from the pool deck.

**Highlights:** Quantify swimming technique, Measure hand force in 6 directions, Palm-sized device, Pool deck analysis, Improve swimming performance

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CORE Thermal Sensor free?

CORE Thermal Sensor is free to download, with no in-app purchases.

### Is SwimBETTER free?

SwimBETTER is free to download, with no in-app purchases.

### Which has better reviews, CORE Thermal Sensor or SwimBETTER?

SwimBETTER is rated higher. CORE Thermal Sensor averages 2.5 out of 5 from 35 ratings, while SwimBETTER averages 5.0 from 1 ratings.

### Do CORE Thermal Sensor or SwimBETTER have ads?

Neither CORE Thermal Sensor nor SwimBETTER shows ads.

### Which is updated more often, CORE Thermal Sensor or SwimBETTER?

CORE Thermal Sensor ships an update every 2 months, and SwimBETTER monthly. Most recently, CORE Thermal Sensor was updated on October 15, 2026 and SwimBETTER on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*