# CORE Thermal Sensor vs Thermometer

The clearest difference is rating: Thermometer at 4.6 against CORE Thermal Sensor's 2.5. Thermometer also leads on update cadence (every 2 weeks vs every 2 months) and review sentiment (32% vs 16%). CORE Thermal Sensor's advantage is in-app purchases (none vs 6). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Thermometer sells 6 in-app purchases, starting at $5.99 per 7 days. CORE Thermal Sensor asks for nothing beyond the download.

Thermometer holds the better App Store score, 4.6 against 2.5. That said, the two scores are not equally well evidenced: Thermometer has 407 ratings behind it against 35, so its average is the more settled of the two. Written reviews point the same way: 16% of CORE Thermal Sensor's written reviews are positive against 32% of Thermometer's.

CORE Thermal Sensor ships an update every 2 months, Thermometer every 2 weeks. The most recent releases landed on September 23, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | CORE Thermal Sensor | Thermometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (35 ratings)](https://appshunter.io/ios/app/core-thermal-sensor/id1521866309/reviews) | **[4.6 (407 ratings)](https://appshunter.io/ios/app/thermometer-body-temperature/id6683301324/reviews)** |
| Number of ratings | 35 | **407** |
| Positive reviews | 15.6% of reviews | **32.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 55 MB | 59 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [greenteg AG](https://appshunter.io/developer/1510577388) | [199 Developments Private Limited](https://appshunter.io/developer/1531051207) |

## 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


### Thermometer

[App page](https://appshunter.io/ios/app/thermometer-body-temperature/id6683301324)

Estimate body temperature using your smartphone without a physical thermometer. Track heart rate, blood pressure, and sync with Apple Watch for real-time fever alerts. Log custom health data and generate shareable PDF reports.

**Highlights:** Temperature estimation without a thermometer, Apple Watch Series 8 sync for readings, High fever alerts, Blood pressure tracking and trend analysis, Custom health logs with notes, Apple Health sync, Shareable PDF reports

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Week- Body Temperature Checker | $5.99 | per 7 days |
| Year Promo- Body Thermometer | $19.99 | per year |
| Year- Body Temperature Checker | $29.99 | per year |
| Yearly- Body Fever Checker | $29.99 | per year |
| Yearly - Thermometer + Blood Oxygen | $29.99 | per year |
| Lifetime- Body Fever Checker | $49.99 | one-time |

**What reviewers like**

- 🚀 Accurate temperature readings
- 👍 Helpful for tracking health issues
- 👍 Useful when no thermometer is available
- 👍 Reliable app with good support

**What reviewers complain about**

- 🐛 Inaccurate temperature readings
- 💰 Expensive subscription
- 🤖 Outdated user interface
- 🤔 Unclear free vs. premium features

**Reported bugs**

- Subscription issues and unexpected charges
- App not functioning as advertised

**Requested features**

- Option to default to Fahrenheit
- Ability to share breathing exercises
- Improved compatibility with newer devices


## Frequently asked questions

### Is CORE Thermal Sensor free?

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

### Is Thermometer free?

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

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

Thermometer is rated higher. CORE Thermal Sensor averages 2.5 out of 5 from 35 ratings, while Thermometer averages 4.6 from 407 ratings.

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

Neither CORE Thermal Sensor nor Thermometer shows ads.

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

CORE Thermal Sensor ships an update every 2 months, and Thermometer every 2 weeks. Most recently, CORE Thermal Sensor was updated on September 23, 2026 and Thermometer on September 28, 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.*