Comparison

CORE Thermal Sensor vs Thermometer

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

Head to head
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.

About

Thermometer

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
Read full description

No thermometer, no problem. Calculate body temperature with your iPhone. Turn your smartphone into a versatile tool for tracking temperature, heart rate, and blood pressure—anytime, anywhere. Functionalities:- -Temperature Estimation: Use your smartphone to estimate body temperature without the need for a physical thermometer. -Apple Watch Sync: Connect seamlessly with Apple Watch Series 8 for automatic temperature readings and real-time fever alerts. -High Fever Alerts: Receive automatic alerts from your Apple Watch when a high fever is detected, keeping you informed in real-time. -Blood Pressure Tracking: Effortlessly log and track your blood pressure, complete with trend analysis for better insights and PDF sharing. -Custom Health Logs: Add personalized notes to track symptoms, treatments, or anything else alongside your health data. -Apple Health sync and PDF reports: Sync with Apple Health and generate easy-to-share temperature PDF reports to keep your family informed. Whether you’re managing a fever, keeping an eye on your cardiovascular health, or tracking your blood pressure, this app offers a simple and effective way to stay in control of your wellness. Ideal for personal use, families, and healthcare providers, our app ensures you stay informed about your vital signs and make confident health decisions. Important: This app is not intended to replace medical advice or treatment. Please consult with a healthcare professional for any medical issues. Terms of use: https://bodytemperatureche.wixsite.com/website-5/legal Privacy policy: https://bodytemperatureche.wixsite.com/website-5/legal Visit us: https://https://bodytemperatureche.wixsite.com/website-5

Screenshots

CORE Thermal Sensor4 screens
Thermometer4 screens

Verdict

The call

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.

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
CORE Thermal Sensor versus Thermometer: the parameters behind the verdict, then further details
ParameterCORE Thermal SensorThermometer
PriceFreeFree
Rating2.5 (35 ratings)4.6 (407 ratings) — better
Positive reviews15.6% of reviews32.1% of reviews — better
Number of ratings35407 — better
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPod, Apple Watch
Requires iOS15.115.0 — better
Further details — not scored
Size55 MB59 MB
Age rating4+17+
Developergreenteg AG199 Developments Private Limited

Customer experience

CORE Thermal Sensor

All ratings35 ratings
Positive22.9%
Neutral20.0%
Negative57.1%
Written reviews32 reviews
Positive15.6%
Neutral25.0%
Negative59.4%

Thermometer

All ratings407 ratings
Positive92.6%
Neutral0.5%
Negative6.9%
Written reviews56 reviews
Positive32.1%
Neutral7.1%
Negative60.7%

Bugs and requests

CORE Thermal Sensor

Not enough reviews yet to summarise bugs or requests.

Thermometer

Reported bugs

2 issues
  • Subscription issues and unexpected charges
  • App not functioning as advertised

Requested features

3 requests
  • Option to default to Fahrenheit
  • Ability to share breathing exercises
  • Improved compatibility with newer devices

In-app purchases

None

CORE Thermal Sensor

No in-app purchases

6 purchases

Thermometer

Subscriptions5
  • Week- Body Temperature Checker$5.997 Days
  • Year Promo- Body Thermometer$19.991 Year
  • Year- Body Temperature Checker$29.991 Year
Show 2 more
  • Yearly- Body Fever Checker3 Days trial$29.991 Year
  • Yearly - Thermometer + Blood Oxygen$29.991 Year
One-time1
  • Lifetime- Body Fever Checker$49.99

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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