Comparison

ThermoWatch+ for Watch vs CORE Thermal Sensor

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ThermoWatch+ for Watch

Easily log body temperature and basal body temperature data directly from your Apple Watch to the Health app. Features a sophisticated UI designed for the Digital Crown, making data entry quick and intuitive. Note: This app registers measured values; the Apple Watch itself does not measure temperature.

Highlights
  • Add body temperature data via Apple Watch
  • Add basal body temperature data via Apple Watch
  • Sophisticated Digital Crown UI
  • Integrates with Apple Health
Features
Read full description

ThermoWatch+ can be register Body Temperature(&Basal Body Temperature) data Point to Health app for Apple Watch. Features - Add Body Temperature Data by using your WATCH - Add Basal Body Temperature Data by using your WATCH - Sophisticated UI for Digital Crown ※Apple Watch do not have a mechanism for measuring body temperature. ThermoWatch+ is an app to register the measured value. ※Apple Watch supported by later than iPhone5 models.Previous models than iPhone4S (Including iPod touch) is not able to use Apple Watch.

About

CORE Thermal Sensor

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
Read full description

The CORE Thermal Sensor accurately measures your core body temperature and thermal strain on your body – continuously and non-invasively. Thermal data and insights are critical for facilitating safe and effective heat training and for performing optimally on race day. Designed for athletes at all levels, CORE will help to improve your training and performance in your personal adventures or races. IMPORTANT: The CORE app is designed to work with the CORE device which you can order at www.corebodytemp.com Here's how it works: • Set up your CORE sensor: connect your heart rate monitor and sports devices for optimal sensor use. • Measure your thermal vitals during training: mount the newly designed clip on your heart rate strap and snap in the CORE sensor. Shake the sensor to wake it up, wear it and track your thermal data. • Core body temperature: the interior temperature deep in your body, including organs and other tissues. A critical measure during sports, it can reach up to 40°C (104°F) during vigorous activity in hot environments. Be aware that hotter is not better – cooler is faster. • Heat Strain Index: A combination of your core body temperature and skin temperature representing the thermal strain on your body. The real-time feedback on how hard your body is working to stay cool, delivering a value from 0 (no heat strain) to around 10 (extremely high heat strain). • Heat Zones: Your Heat Strain Index divided into easy-to-use zones. Heat Zone 3 will likely lead to a performance loss, BUT it is the needed stimuli to create adaptations in your body. During heat training, strive for time in heat zone 3. During racing, stay cool and prevent a performance loss by staying in heat zone 1 or 2. • Heat Training Load: a cumulative daily metric of the heat strain on your body. A daily value of 10 out of 10 indicates ideal contribution to heat adaptations. More is not always better! • Heat Adaptation Score: Track your heat adaptations over time with effective heat training. Get a heat champion to perform best in the heat. Long-term heat training will most likely lead to improvements also in cool conditions. • Add your passive heat training: Supplementing your active heat training or general training with passive heat exposure in a sauna or hot bath. You can track your sessions in the app manually, contributing to your heat adaptation score. NOTE: do NOT take your CORE sensor into the sauna or hot environments. What else you can do in the CORE app: • Dig into the details: See a breakdown of your thermal data, and even see trends across days, weeks and months. • Share your CORE metrics with your friends through the social sharing feature, earning more kudos and likes • Connect your connectivity accounts (e.g. Garmin) to directly synchronize your data after the training. • Update your sensor to the latest firmware ensuring having the best sensor functionality. Note: CORE provides products and services designed for general fitness and training purposes. For accurate measurement readings during sports, a connection to a heart rate monitor is necessary. CORE products and services are not medical devices, not intended to treat or diagnose any disease, and should not be used as a substitute for professional medical advice, diagnosis or treatment. All content available through CORE products and services is for general informational purposes only.

Screenshots

ThermoWatch+ for Watch3 screens
CORE Thermal Sensor4 screens

Verdict

The call

The clearest difference is ads: CORE Thermal Sensor at none against ThermoWatch+ for Watch's shown. CORE Thermal Sensor also leads on monetization model (free vs ad-supported). ThermoWatch+ for Watch's advantage is iOS requirement (8.2 vs 15.1). On price, rating, review sentiment and ratings volume there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 2.5 for ThermoWatch+ for Watch against 2.5 for CORE Thermal Sensor. Both are backed by a comparable volume of ratings — 90 and 35 respectively. Written reviews are what separate them: 21% of ThermoWatch+ for Watch's written reviews are positive against 19% of CORE Thermal Sensor's.

UpkeepUpdate frequency

ThermoWatch+ for Watch ships an update every 3 months, CORE Thermal Sensor every 2 months. The most recent releases landed on October 24, 2026 and October 23, 2026 respectively.

Scorecard3 real differences · 7 level
ThermoWatch+ for Watch versus CORE Thermal Sensor: the parameters behind the verdict, then further details
ParameterThermoWatch+ for WatchCORE Thermal Sensor
PriceFreeFree
Rating2.5 (90 ratings) — better2.5 (35 ratings)
Positive reviews21.2% of reviews — better18.8% of reviews
Number of ratings90 — better35
Update frequencyEvery 3 monthsEvery 2 months — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supportedFree — better
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod
Requires iOS8.2 — better15.1
Further details — not scored
Size10 MB55 MB
Age rating4+4+
DeveloperAirwire products.greenteg AG

Customer experience

ThermoWatch+ for Watch

All ratings90 ratings
Positive30.0%
Neutral18.9%
Negative51.1%
Written reviews66 reviews
Positive21.2%
Neutral9.1%
Negative69.7%

CORE Thermal Sensor

All ratings35 ratings
Positive22.9%
Neutral20.0%
Negative57.1%
Written reviews48 reviews
Positive18.8%
Neutral25.0%
Negative56.3%

In-app purchases

None

ThermoWatch+ for Watch

No in-app purchases

None

CORE Thermal Sensor

No in-app purchases

Questions

Is ThermoWatch+ for Watch free?
ThermoWatch+ for Watch is free to download, with no in-app purchases.
Is CORE Thermal Sensor free?
CORE Thermal Sensor is free to download, with no in-app purchases.
Which has better reviews, ThermoWatch+ for Watch or CORE Thermal Sensor?
ThermoWatch+ for Watch is rated higher. ThermoWatch+ for Watch averages 2.5 out of 5 from 90 ratings, while CORE Thermal Sensor averages 2.5 from 35 ratings.
Do ThermoWatch+ for Watch or CORE Thermal Sensor have ads?
ThermoWatch+ for Watch shows ads; CORE Thermal Sensor does not.
Which is updated more often, ThermoWatch+ for Watch or CORE Thermal Sensor?
ThermoWatch+ for Watch ships an update every 3 months, and CORE Thermal Sensor every 2 months. Most recently, ThermoWatch+ for Watch was updated on October 24, 2026 and CORE Thermal Sensor on October 23, 2026.

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