# CORE Thermal Sensor vs Calibre Biometrics

The clearest difference is rating: Calibre Biometrics at 4.5 against CORE Thermal Sensor's 2.5. Calibre Biometrics also leads on review sentiment (50% vs 19%) and update cadence (every 4 weeks vs every 2 months). CORE Thermal Sensor's advantage is in-app purchases (none vs 1) and ratings volume (35 vs 2). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Calibre Biometrics sells 1 in-app purchase, starting at $7.99 per month. CORE Thermal Sensor asks for nothing beyond the download.

Calibre Biometrics holds the better App Store score, 4.5 against 2.5. That said, the two scores are not equally well evidenced: CORE Thermal Sensor has 35 ratings behind it against 2, 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 50% of Calibre Biometrics's.

CORE Thermal Sensor ships an update every 2 months, Calibre Biometrics every 4 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | CORE Thermal Sensor | Calibre Biometrics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (35 ratings)](https://appshunter.io/ios/app/core-thermal-sensor/id1521866309/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/calibre-biometrics/id6743721886/reviews)** |
| Number of ratings | **35** | 2 |
| Positive reviews | 18.8% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free | Free |
| Size | 55 MB | 116 MB |
| Requires iOS | **15.1** | 15.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [greenteg AG](https://appshunter.io/developer/1510577388) | [BreathTaking Tech LLC](https://appshunter.io/developer/1609706657) |

## 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


### Calibre Biometrics

[App page](https://appshunter.io/ios/app/calibre-biometrics/id6743721886)

This app pairs with a wearable device to track and analyze key metabolic and performance metrics like VO2 Max and resting metabolic rate. It provides detailed insights into your body's energy expenditure and fat burning zones. Designed for informational and educational use, it complements professional health guidance.

**Highlights:** View biometric data, Record metabolic information, Analyze VO2 Max, Monitor Resting Metabolic Rate, Track FatMax and Calories, Companion to wearable tracker

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calibre Premium | $7.99 | per month |


## Frequently asked questions

### Is CORE Thermal Sensor free?

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

### Is Calibre Biometrics free?

Calibre Biometrics is free to download, with in-app purchases available.

### Which has better reviews, CORE Thermal Sensor or Calibre Biometrics?

Calibre Biometrics is rated higher. CORE Thermal Sensor averages 2.5 out of 5 from 35 ratings, while Calibre Biometrics averages 4.5 from 2 ratings.

### Do CORE Thermal Sensor or Calibre Biometrics have ads?

Neither CORE Thermal Sensor nor Calibre Biometrics shows ads.

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

CORE Thermal Sensor ships an update every 2 months, and Calibre Biometrics every 4 weeks. Most recently, CORE Thermal Sensor was updated on October 23, 2026 and Calibre Biometrics on October 24, 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.*