Comparison

CORE Thermal Sensor vs Sauce for Strava™

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

Sauce for Strava™

Enhance your cycling and running data with this lightweight browser extension. It provides more detailed information directly within the platform, offering a richer experience for athletes.

Highlights
  • Enhanced cycling data
  • Improved running metrics
  • Client-side JavaScript
  • Lightweight extension
  • Simple interface
Features
Read full description

The Sauce extension upgrades Strava with better cycling and running information. It's a simple, lightweight and pure client-side JavaScript addition.

Screenshots

CORE Thermal Sensor4 screens
Sauce for Strava™3 screens

Verdict

The call

The clearest difference is review sentiment: Sauce for Strava™ at 71% against CORE Thermal Sensor's 19%. Sauce for Strava™ also leads on rating (4.8 vs 2.5). CORE Thermal Sensor's advantage is ratings volume (35 vs 4) and iOS requirement (15.1 vs 18.0). On price, update cadence, ads and in-app purchases 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

Sauce for Strava™ holds the better App Store score, 4.8 against 2.5. That said, the two scores are not equally well evidenced: CORE Thermal Sensor has 35 ratings behind it against 4, 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 71% of Sauce for Strava™'s.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 15, 2026 and October 4, 2026 respectively.

Scorecard4 real differences · 6 level
CORE Thermal Sensor versus Sauce for Strava™: the parameters behind the verdict, then further details
ParameterCORE Thermal SensorSauce for Strava™
PriceFreeFree
Rating2.5 (35 ratings)4.8 (4 ratings) — better
Positive reviews18.8% of reviews71.4% of reviews — better
Number of ratings35 — better4
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.1 — better18.0
Further details — not scored
Size55 MB6 MB
Age rating4+4+
Developergreenteg AGSauce, LLC

Customer experience

CORE Thermal Sensor

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

Sauce for Strava™

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

In-app purchases

None

CORE Thermal Sensor

No in-app purchases

None

Sauce for Strava™

No in-app purchases

Questions

Is CORE Thermal Sensor free?
CORE Thermal Sensor is free to download, with no in-app purchases.
Is Sauce for Strava™ free?
Sauce for Strava™ is free to download, with no in-app purchases.
Which has better reviews, CORE Thermal Sensor or Sauce for Strava™?
Sauce for Strava™ is rated higher. CORE Thermal Sensor averages 2.5 out of 5 from 35 ratings, while Sauce for Strava™ averages 4.8 from 4 ratings.
Do CORE Thermal Sensor or Sauce for Strava™ have ads?
Neither CORE Thermal Sensor nor Sauce for Strava™ shows ads.
Which is updated more often, CORE Thermal Sensor or Sauce for Strava™?
CORE Thermal Sensor ships an update every 2 months, and Sauce for Strava™ every 2 months. Most recently, CORE Thermal Sensor was updated on October 15, 2026 and Sauce for Strava™ on October 4, 2026.

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