Frontier X

108 reviews
Content rating
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About this app

This application allows you to connect with and use Frontier X - a revolutionary new wearable device that monitors your lungs and heart and gives you real-time alerts as you exercise. Once you download this application on your Android Phone, you can view your real-time data if you exercise with the Frontier X and your phone. In order to use this application, you need to have the Frontier X device, available at

The Frontier X is a chest-worn device that has the following features:

--Suitable for Running, cycling, swimming and any other endurance exercises

--Effort estimation based on Breathing Rate

--Cardiac Strain estimation based on your ECG

--Real-time vibration alerts when you cross your Effort and Strain thresholds

--Accurate internal training load computation spanning all exercises

--Ability to live-stream and record your ECG for up to 24 hours

--Actionable training insights

--Easy to use. Strap on and start. Sync later

--View quick workout summary on device screen

--Highly accurate Heart Rate data

--IP67 Waterproof up to 1.5 M

--Battery: 14+ days of typical use, up to 24-hrs continuous use
Updated on

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 3 others
Data is encrypted in transit
You can request that data be deleted
108 reviews
Jason Johns
9 April 2022
Works amazing when you aren't wearing a dry fit shirt. The static interferes with the data. Great customer service. Lots of useful information generated. Love the breath rate and heart rate warnings. HRV metrics could be improved but that's hard when you are moving. Would be great if the heart rate updated every second on a connected smart watch. Hope some feature updates are pushed out soon but great product overall!
3 people found this review helpful
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Fourth Frontier
14 April 2022
Hi, Thank you for providing your valuable feedback. With every new app version we are introducing new features and improving existing ones. We are sure that your feedback will only help us improve further.
David Grieve
12 January 2022
Flakey device, poor support, buggy firmware. Device was showing zero percent charge when it was fully charged. Asked support about this and never got a response. Sometimes syncing activity on app goes over 100% complete, which doesn't give me confidence in the quality of the firmware and app. Now the device won't sync at all; the app gives an error message which is of no use. I'm hoping resetting device and removing/reinstalling the app will help.
1 person found this review helpful
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Fourth Frontier
13 January 2022
Hi David, Thank you for your review and for reporting issues that you're facing with the app. ​They've been reported to our engineering team and we shall keep you posted on the developments as well as the solutions. We'd replied to your email regarding the same as well. Please reach out to us for any other concerns at
Chuck Swanson
7 August 2022
The programmer for this app is a moron. It is not possible to enter a birth date manually and the app requires you to use a pop up calendar. So if you are of any age at all you have to tap the calender 12 times for each year of age. So for a 12 year old, that's 144 times. Then, after you select you age and enter everything and select "I accept". The app takes you back to the enter you information screen. Unable to sign up.
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Fourth Frontier
12 August 2022
We are using Android system date picker, you need to tap on year (top left in popup calendar) and it will give you an option to pick year directly. However our technical team has made changes to make it more intuitive. Please update your app to the latest version. If you have other problems, please contact us at

What's new

Bug fixes and improvements.