Comparison

COROS vs calera

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Daily data tracking (sleep, steps, calories)
  • Activity summaries for all sports
  • Map and route management
  • Device and personal settings customization
  • Third-party app integration
Features
Read full description

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

About

calera

Features
Read full description

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

COROS4 screens
calera3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

COROS ships an update every 2 weeks, calera every 4 months. Both last shipped on November 3, 2026.

Scorecard1 real difference · 9 level
COROS versus calera: the parameters behind the verdict, then further details
ParameterCOROScalera
PriceFreeFree
Rating4.3 (800 ratings) — better—
Positive reviews54.2% of reviews—
Number of ratings800 — better—
Update frequencyEvery 2 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS14.0 — better15.6
Further details — not scored
Size856 MB6 MB
Age rating4+4+
DeveloperCOROS 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

None

COROS

No in-app purchases

None

calera

No in-app purchases

Questions

Is COROS free?
COROS is free to download, with no in-app purchases.
Is calera free?
calera is free to download, with no in-app purchases.
Do COROS or calera have ads?
Neither COROS nor calera shows ads.
Which is updated more often, COROS or calera?
COROS ships an update every 2 weeks, and calera every 4 months. Most recently, COROS was updated on November 3, 2026 and calera on November 3, 2026.

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