CORE Thermal Sensor vs Azum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
Read full descriptionHide 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.
Azum
Read full descriptionHide full description
AZUM understands the unique challenges that sports coaches face in today's fast-paced world. That's why we've created a comprehensive platform that combines cutting-edge technology with personalised support. We make it easy for you to communicate with your athletes and simplify your life as a coach so that your coaching business is successful. AZUM Mobile is your number 1 app for training and nutrition! Athletes have their training always and everywhere at their fingertips with AZUM mobile. The app supports athletes in their daily training, motivates them and analyses their performance development. AZUM system helps athletes of all performance levels to achieve their goals. Selected functions: Clear presentation of your workouts, events and completed training sessions. Understandable explanations and video instructions for the exercises Individual training zones and the possibility to create a metabolic profile Analysis of your workouts and tracking of your performance development Direct training feedback for your coach Automatic synchronisation with Garmin, Polar, Suunto, Coros, Wahoo or Strava Practical target/actual comparison that shows you whether you are sticking to your training plans A comprehensive food database and nutrition monitoring allow you to optimise your diet Track various parameters of your subjective well-being and use them to control your training load And many other functions that support you in your daily training routine.
Screenshots
Verdict
The clearest difference is ads: CORE Thermal Sensor at none against Azum's shown. Azum's advantage is update cadence (every 3 weeks vs every 2 months). On price, in-app purchases, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CORE Thermal Sensor ships an update every 2 months, Azum every 3 weeks. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.
| Parameter | CORE Thermal Sensor | Azum |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (35 ratings) — better | — |
| Positive reviews | 18.8% of reviews | — |
| Number of ratings | 35 — better | — |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 55 MB | 45 MB |
| Age rating | 4+ | 17+ |
| Developer | greenteg AG | AZUM system AG |
In-app purchases
CORE Thermal Sensor
No in-app purchases
Azum
No in-app purchases









