Frontier X

215 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
5 Dec 2023

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

Ratings and reviews

204 reviews
Steven Wann
9 April 2023
The device itself "Frontier X2" I'd rate above 5-Stars if I could 6 or 7 even, been using it the past day and everything about it is amazing. The GUI for the app has a few bugs still, hiccups, navigation issues. Unable to back up from streaming. Graphs not entirely user friendly though this may just be a Pixel 7/Android issue. The data recorded is what matters. Haven't seen yet if there is a web app. Tho these are all just minor inconveniences for now and to me seem like the UI can be updated
2 people found this review helpful
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Fourth Frontier
9 March 2023
Thank you for your feedback. We would like to let you know that you can view your data on the web application by logging into For more information on viewing your data on the web application, please visit the link below:
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!
4 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.
3 people 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

What's new

Bug fixes and improvements

App support