Comparison

CORE Thermal Sensor vs Pacer for Running

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

Pacer for Running

This app guides users through a Cardiopulmonary Exercise Test (CPET) using a connected device for precise cardio performance data. It provides detailed reports and personalized training plans to enhance running progress and reduce injury risk.

Highlights
  • Guided Cardiopulmonary Exercise Test (CPET)
  • Connects with PACER device
  • Accurate cardio performance data
  • Detailed test reports
  • Personalized training plans
  • Injury risk minimization
Features
Read full description

Connect with our PACER device to take a guided Cardiopulmonary Exercise Test (CPET) using precise protocols. Our app supports you through each step, ensuring accurate data collection and reliable results on your cardio performance. After the test, receive a detailed report and personalized training plans based on your results, designed to maximize your running progress and minimize injury risk. Users can also download their test data for flexible use according to their individual needs. Disclaimer: This app is intended for fitness purposes only. Always consult a medical professional for advice before using this app or making any medical decisions.

Screenshots

CORE Thermal Sensor4 screens
Pacer for Running4 screens

Verdict

The call

The clearest difference is rating: CORE Thermal Sensor at 2.5 against Pacer for Running's 1.0. CORE Thermal Sensor also leads on ratings volume (35 vs 1) and review sentiment (19% vs 0%). Pacer for Running's advantage is update cadence (every 5 days vs every 2 months). On price, ads, in-app purchases and monetization model 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

CORE Thermal Sensor holds the better App Store score, 2.5 against 1.0. That said, the two scores are not equally well evidenced: CORE Thermal Sensor has 35 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 19% of CORE Thermal Sensor's written reviews are positive against 0% of Pacer for Running's.

UpkeepUpdate frequency

CORE Thermal Sensor ships an update every 2 months, Pacer for Running every 5 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

Scorecard4 real differences · 6 level
CORE Thermal Sensor versus Pacer for Running: the parameters behind the verdict, then further details
ParameterCORE Thermal SensorPacer for Running
PriceFreeFree
Rating2.5 (35 ratings) — better1.0 (1 ratings)
Positive reviews18.8% of reviews — better0.0% of reviews
Number of ratings35 — better1
Update frequencyEvery 2 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.1 — better15.6
Further details — not scored
Size55 MB102 MB
Age rating4+4+
Developergreenteg AGNeumaFIT Co.,ltd

Customer experience

CORE Thermal Sensor

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

Pacer for Running

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

CORE Thermal Sensor

No in-app purchases

None

Pacer for Running

No in-app purchases

Questions

Is CORE Thermal Sensor free?
CORE Thermal Sensor is free to download, with no in-app purchases.
Is Pacer for Running free?
Pacer for Running is free to download, with no in-app purchases.
Which has better reviews, CORE Thermal Sensor or Pacer for Running?
CORE Thermal Sensor is rated higher. CORE Thermal Sensor averages 2.5 out of 5 from 35 ratings, while Pacer for Running averages 1.0 from 1 ratings.
Do CORE Thermal Sensor or Pacer for Running have ads?
Neither CORE Thermal Sensor nor Pacer for Running shows ads.
Which is updated more often, CORE Thermal Sensor or Pacer for Running?
CORE Thermal Sensor ships an update every 2 months, and Pacer for Running every 5 days. Most recently, CORE Thermal Sensor was updated on November 3, 2026 and Pacer for Running on November 4, 2026.

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