COROS vs calera
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
COROS
Enhance your fitness journey with detailed daily data, activity summaries, and advanced navigation tools. Customize your devices, download training plans, and seamlessly sync with popular third-party health platforms.
- Daily data tracking (sleep, steps, calories)
- Activity summaries for all sports
- Map and route management
- Device and personal settings customization
- Third-party app integration
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The COROS app is your tool to help improve your fitness, download training plans, navigate with confidence, customize your devices, and more. The app will help you to track, and view: - Daily Data such as Sleep, Steps, Calories and more - Activity Summaries for all sports recorded on your watch - The Explore Page to manage maps, routes, and saved locations - Profile Page to customize your watch and personal settings - Connect and sync to 3rd party apps like Apple HealthKit, Google Health Connect, Strava, and more Note: - Sync steps, heart rate and other data to Apple devices using HealthKit - Continuous background use of GPS can decrease battery life
calera
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Calera is the first solution to monitor core body temperature continuously and non-invasively. Using the same technology as CORE but being specifically designed for researchers, calera will allow real-time core body temperature monitoring and high-resolution (1 Hz) data downloading. Individually calibrated devices will make sure your measurements are of the highest accuracy. IMPORTANT: The calera app is designed to work with the calera device, which can be ordered at https://corebodytemp.com/products/core-calera-research. This app is not designed for use with the CORE sensor. 1. What does calera do? calera helps you track the core body temperature. This is the interior temperature of the body – including organs and other tissues – which can substantially differ from the skin temperature. Core temperature changes due to physiological processes such as illness, intense activity, circadian cycles, or ovulation. calera will allow you to continuously and non-invasively track this internal temperature with high accuracy during your research experiments. 2. Get access to your data at any time calera stores your data locally on the device and connects to the app to display it. If you use the app to display the temperature, the data is also pushed to a secure cloud solution, where you can view it and download it for further analysis. calera additionally comes with two unique features: the computer based Research tool and high time resolution logging mode. For more information about data storage and accessibility, please check the calera manual. 3. Why is calera different from other solutions? Before calera, only invasive methods such as rectal probes or ingestible e-pills were available for measuring the core body temperature. For the first time, calera provides an accurate, continuous, non-invasive solution for monitoring core body temperature, regardless of the activity and environment. As proof of its unique value, the consumer version of calera, CORE, is already used by UCI World Teams and top triathletes worldwide. The full list of well-known athletes, trainers and other users is available at: www.corebodytemp.com. 4. How does it work? The calera device clips onto your heart-rate monitor belt or sports bra. It can also be worn using specially designed medical-grade patches. For best results, wear calera on the same side as your smartwatch. calera supports ANT+ and works with most Garmin Connect IQ and Wahoo devices. More info: Website: https://corebodytemp.com/pages/research Privacy Policy: https://www.greenteg.com/privacy Terms and conditions: https://www.greenteg.com/terms
Screenshots
Verdict
The clearest difference is update cadence: COROS at every 2 weeks against calera's every 4 months. On price, ads, in-app purchases and device support 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.
COROS ships an update every 2 weeks, calera every 4 months. Both last shipped on November 3, 2026.
| Parameter | COROS | calera |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (800 ratings) — better | — |
| Positive reviews | 54.2% of reviews | — |
| Number of ratings | 800 — better | — |
| Update frequency | Every 2 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 856 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | COROS Wearables Inc. | greenteg AG |
Bugs and requests
COROS
Reported bugs
5 issues- App crashes frequently
- Inability to log in or sync data
- Inconsistent data between watch and app
- Elevation/GPS tracking issues
- Strength training mode not working properly
Requested features
5 requests- Add more watch face options
- Improve sleep tracking accuracy
- Integrate with Apple Health app
- Add ability to edit/delete activities
- Provide more customization options
calera
Not enough reviews yet to summarise bugs or requests.
In-app purchases
COROS
No in-app purchases
calera
No in-app purchases









