Comparison

CORE Thermal Sensor vs Factors

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

Factors

Read full description

AI-driven app that uses machine-learning to help track cyclists go faster. Syncs all of your training data into a single performance platform. Showcasing links between sleep, strength, speed, weight, heart rate, nutrition, cadence, and power data. Specific AI-powered insights developed in partnership with development athletes and track cycling world champions. Terms of Use (EULA): https://www.factorstraining.com/terms-of-use-eula Privacy Policy: https://www.factorstraining.com/privacy-policy

Screenshots

CORE Thermal Sensor4 screens
Factors4 screens

Verdict

The call

The clearest difference is in-app purchases: CORE Thermal Sensor at none against Factors's 2. Factors's advantage is update cadence (every 11 days vs every 2 months). 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. Factors sells 2 in-app purchases, starting at $9.99 per month. CORE Thermal Sensor asks for nothing beyond the download.

UpkeepUpdate frequency

CORE Thermal Sensor ships an update every 2 months, Factors every 11 days. The most recent releases landed on October 23, 2026 and October 14, 2026 respectively.

Scorecard2 real differences · 8 level
CORE Thermal Sensor versus Factors: the parameters behind the verdict, then further details
ParameterCORE Thermal SensorFactors
PriceFreeFree
Rating2.5 (35 ratings) — better—
Positive reviews18.8% of reviews—
Number of ratings35 — better—
Update frequencyEvery 2 monthsEvery 11 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.115.1
Further details — not scored
Size55 MB74 MB
Age rating4+4+
Developergreenteg AGTrainingFactors

In-app purchases

None

CORE Thermal Sensor

No in-app purchases

2 purchases

Factors

Subscriptions2
  • Monthly Subscription1 Month trial$9.991 Month
  • Yearly Subscription1 Month trial$99.991 Year

Questions

Is CORE Thermal Sensor free?
CORE Thermal Sensor is free to download, with no in-app purchases.
Is Factors free?
Factors is free to download, with in-app purchases available.
Do CORE Thermal Sensor or Factors have ads?
Neither CORE Thermal Sensor nor Factors shows ads.
Which is updated more often, CORE Thermal Sensor or Factors?
CORE Thermal Sensor ships an update every 2 months, and Factors every 11 days. Most recently, CORE Thermal Sensor was updated on October 23, 2026 and Factors on October 14, 2026.

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