# CORE Thermal Sensor vs Hammerhead Companion

The clearest difference is rating: CORE Thermal Sensor at 2.5 against Hammerhead Companion's 2.0. CORE Thermal Sensor also leads on review sentiment (19% vs 10%) and iOS requirement (15.1 vs 17.6). Hammerhead Companion's advantage is update cadence (monthly vs every 2 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

CORE Thermal Sensor holds the better App Store score, 2.5 against 2.0. Both are backed by a comparable volume of ratings — 35 and 95 respectively. Written reviews point the same way: 19% of CORE Thermal Sensor's written reviews are positive against 10% of Hammerhead Companion's.

CORE Thermal Sensor ships an update every 2 months, Hammerhead Companion monthly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | CORE Thermal Sensor | Hammerhead Companion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (35 ratings)](https://appshunter.io/ios/app/core-thermal-sensor/id1521866309/reviews)** | [2.0 (95 ratings)](https://appshunter.io/ios/app/hammerhead-companion/id6476576279/reviews) |
| Number of ratings | 35 | **95** |
| Positive reviews | **18.8% of reviews** | 9.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 55 MB | 28 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [greenteg AG](https://appshunter.io/developer/1510577388) | [SRAM LLC](https://appshunter.io/developer/427232200) |

## 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


### Hammerhead Companion

[App page](https://appshunter.io/ios/app/hammerhead-companion/id6476576279)

Seamlessly transfer ride data, routes, and workouts to your Karoo bike computer. Sync with popular training platforms and use your phone's maps for navigation. Stay connected with live tracking and phone notifications on your device.

**Highlights:** Ride upload to training platforms, Send locations from phone maps to Karoo, Sync routes without Wi-Fi, Workout synchronization, Live tracking sharing, Phone notifications on Karoo

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

**In-app purchases:** none

**What reviewers like**

- ⭐ Excited for new app
- ⭐ Karoo 2 is a great device

**What reviewers complain about**

- ❌ Only supports latest Karoo device
- ❌ Karoo 2 not supported
- ❌ Unable to pair new Karoo device
- ❌ App doesn't offer any functionality beyond connecting to phone
- ❌ Feels like a money grab to force users to upgrade


## Frequently asked questions

### Is CORE Thermal Sensor free?

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

### Is Hammerhead Companion free?

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

### Which has better reviews, CORE Thermal Sensor or Hammerhead Companion?

CORE Thermal Sensor is rated higher. CORE Thermal Sensor averages 2.5 out of 5 from 35 ratings, while Hammerhead Companion averages 2.0 from 95 ratings.

### Do CORE Thermal Sensor or Hammerhead Companion have ads?

Neither CORE Thermal Sensor nor Hammerhead Companion shows ads.

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

CORE Thermal Sensor ships an update every 2 months, and Hammerhead Companion monthly. Most recently, CORE Thermal Sensor was updated on November 3, 2026 and Hammerhead Companion on November 4, 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.*