# CORE Thermal Sensor vs Nix Solo

The clearest difference is rating: Nix Solo at 4.8 against CORE Thermal Sensor's 2.5. Nix Solo also leads on update cadence (every 10 days vs every 2 months). On price, review sentiment, ratings volume and ads there is nothing between them.

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

Nix Solo holds the better App Store score, 4.8 against 2.5. Both are backed by a comparable volume of ratings — 35 and 67 respectively. Written reviews complicate that: 19% of CORE Thermal Sensor's written reviews are positive against 14% of Nix Solo's, so the app with the better star average is not the one people write more warmly about.

CORE Thermal Sensor ships an update every 2 months, Nix Solo every 10 days. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | CORE Thermal Sensor | Nix Solo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.5 (35 ratings)](https://appshunter.io/ios/app/core-thermal-sensor/id1521866309/reviews) | **[4.8 (67 ratings)](https://appshunter.io/ios/app/nix-solo/id1632680170/reviews)** |
| Number of ratings | 35 | **67** |
| Positive reviews | **18.8% of reviews** | 14.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free | Free |
| Size | 55 MB | 65 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [greenteg AG](https://appshunter.io/developer/1510577388) | [Nix, Inc.](https://appshunter.io/developer/1625732872) |

## 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


### Nix Solo

[App page](https://appshunter.io/ios/app/nix-solo/id1632680170)

Monitor personal fluid and electrolyte losses in real-time during workouts. This app provides insights into sweat composition and hydration needs based on individual biology, using data from a companion biosensor.

**Highlights:** Real-time fluid and electrolyte loss monitoring, Personalized sweat composition insights, Correlates sweat data with environmental factors (Nix Index), Post-workout Sweat Intelligence reports, Integration with Apple Watch and Garmin devices, Workout type and hydration input

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

**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 Nix Solo free?

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

### Which has better reviews, CORE Thermal Sensor or Nix Solo?

Nix Solo is rated higher. CORE Thermal Sensor averages 2.5 out of 5 from 35 ratings, while Nix Solo averages 4.8 from 67 ratings.

### Do CORE Thermal Sensor or Nix Solo have ads?

Neither CORE Thermal Sensor nor Nix Solo shows ads.

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

CORE Thermal Sensor ships an update every 2 months, and Nix Solo every 10 days. Most recently, CORE Thermal Sensor was updated on October 23, 2026 and Nix Solo on October 22, 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.*