Frontier X
Companion App of Frontier X for runners, cyclists and other endurance athletes
App info
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App description
Android App Analysis and Review: Frontier X, Developed by Fourth Frontier Technologies Private Limited. Listed in Health & fitness Category. Current Version Is 10.0.1.6, Updated On 03/10/2025 . According to users reviews on Google Play: Frontier X. Achieved Over 8 thousand Installs. Frontier X Currently Has 322 Reviews, Average Rating 4.4 Stars
With your Frontier X/X2, track your ECG during any activity including exercise, rest or sleep to get detailed insights on heart health and exercise performance. This companion app allows you to connect with Frontier X2 - a revolutionary chest strap wearable smart heart monitor and view your recorded data.Trusted by world-class athletes across the globe, the Frontier X2 is a chest-worn Smart Heart Monitor that provides in-depth real-time feedback on your heart health. It can monitor your
Heart Health
24/7 Continuous ECG
Heart Rate
Heart Rate Variability (HRV)
Breathing Rate
Strain
Rhythms
Training Load
Calories
Stress, and a lot more.
● Accurately record continuous ECG for up to 24hrs during any activity like exercise, running, cycling, resting, sleeping, meditation, etc for comprehensive heart health insights.
● Spot changes in your heart health with Rhythm and Strain.
● Train in the right zone without distractions with real-time, personalized, and discreet vibration alerts.
● Add health event tags to help you understand how lifestyle choices and behavior affect your health.
● Generate PDF reports of your ECG and securely share it, along with other health metrics, with anyone worldwide.
● Seamlessly integrate with Bluetooth-enabled wearables and third-party devices such as GPS sports watches, bike computers, and more.
● AI-enabled algorithms - Receive post-activity training insights, recommendations, and weekly goals.
Now get deeper insights and data with Frontier Premium Subscription*:
Metabolic Profile Analytics: Track training intensity and the impact of lifestyle changes on metabolic health with key metrics like VO2 Max, VO2 Zones, Oxygen Uptake, and Ventilatory Thresholds (VTs).
VO2 Max: Get the most accurate real-time VOo2 Max data. While other wearables estimate using motion and heart rate, our continuous ECG provides precise VOo2 Max readings outside of a lab, tracking cardiovascular efficiency and endurance potential. Unlike wrist-based devices, our 24/7 ECG-based system consistently captures your heart's electrical signals, offering reliable data.
Readiness Score: Determine if your body is ready for peak performance or needs recovery. Advanced algorithms use heart rate, heart rate variability (HRV), and ECG data to guide your daily activities and training.
Sleep Stage Analysis: Get a comprehensive understanding of your sleep quality. Our system uses continuous ECG to track heart patterns and sleep stages.
With Frontier's Premium subscription and Metabolic Profile Analysis, tracking your VO₂ max becomes simpler and more precise.
About Fourth Frontier
Fourth Frontier is an innovative health-tech company focused on revolutionizing heart health monitoring with its cutting-edge wearable ECG technology.
We are the World’s First Smart Heart Monitor. With over 5 billion heartbeats recorded from 120,000+ users across 50+ countries, we are empowering users to understand and manage their heart health in real-time.
These features make the Frontier App a comprehensive tool for heart health management and fitness improvement.
Download the app today and access the most accurate heart health data available.
Apps available for iOS, Android, and Apple Watch.
*A Paid Frontier Premium subscription is required to access the full feature set .
We are currently offering version 10.0.1.6. This is our latest, most optimized version. It is suitable for many different devices. Free download directly apk from the Google Play Store or other versions we're hosting. Moreover, you can download without registration and no login required.
We have more than 2000+ available devices for Samsung, Xiaomi, Huawei, Oppo, Vivo, Motorola, LG, Google, OnePlus, Sony, Tablet ... with so many options, it’s easy for you to choose games or software that fit your device.
It can come in handy if there are any country restrictions or any restrictions from the side of your device on the Google App Store.
What's New
Bug fixes and improvements

Recent Comments
Patrick T
This app just ended my workout and erase my workout just because I set it down in during a res in the most intense part of the workout. Probably the most important part to record. My heart rate was so high, I ended up laying down in the grass unfortunately the blades of grease touched the end button. It really needs to be at the bottom of the screen . . . After all you have to scroll down to see that, maybe scroll for end too (or confirm button) same with erase workouts from device.
David Grieve
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.
Evan
Excellent product for cardiac monitoring and training. I purchased this device for arrhythmia monitoring mainly, but I also wear when exercising. The battery life is great at around 2 days of continuous monitoring, and the unlimited cloud storage is very nice. The EKG quality is clear; short and wide complex rhythms are easily discernable. I would recommend.
Jason Johns
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!
Steven Wann
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
Courtney N
The app has been bugging me lately. It keeps kicking me out and saying my user doesn't exist. The first time it did this, it caused my whole app to mess up. It doesn't let the actual ecg of your activity pop up till days later now and you have to keep the device itself consistently on and running just to eventually get the app to register previous activities? Which is dumb. When it's processing to sync, it should automatically be syncing up for the ecg, not waiting till a week later.
Paul Smith
Had this for 2 years now. The first one cracked and then got water in it. Great for heat rate and strain ECG starts, etc. Quite buggy. Often struggle to sync stats and need to reset the device. Sometimes, I can't start the heart rate monitor and again have to reset it, which is annoying when you are trying to start your workout. Rubber came off one of the straps quite quickly, but frontier replaced that, which was great service. The customer service is generally really good and responsive.
B12ANR
Sandeep? Unable to connect the app until Sandeep approves it? Also unable to make selections at key stages such as 'goals' and 'location services' where it either does not accept the selection or there is no option to select. Not a great start to owning a FF2 monitor!