Frontier X

Name: Frontier X
Rating: 4.6 (270 reviews)
Author: Fourthfrontier

Health & Fitness

Free · In‑App Purchases

270 Ratings
Ages

9+
Years
Category

Health & Fitness
Developer

Fourthfrontier
Language

EN
English
Size

406.5
MB

With your Frontier X/X2, track your 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 - Heart Rate - Heart Rate Variability (HRV) - Breathing Rate - Strain - Rhythms - Training Load - Calories - Stress, and a lot more. • Accurately record your activity like exercise, running, cycling, resting, sleeping, meditation, etc for up to 24hrs with 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. • 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. • Frontier X integrates with HealthKit to export your Frontier X activities into the Health app and to read heart rate and biometric data. • IP67 Waterproof up to 1.5 M • Battery: 14+ days of typical use 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 Vo2 Max data. While other wearables estimate using motion and heart rate, our advanced algorithms provides precise Vo2 Max readings outside of a lab, tracking cardiovascular efficiency and endurance potential. Readiness Score: Determine if your body is ready for peak performance or needs recovery. Advanced algorithms use heart rate, heart rate variability (HRV) to guide your daily activities and training. Sleep Stage Analysis: Get a comprehensive understanding of your sleep quality (Webapp). With Frontier's Premium subscription and Metabolic Profile Analysis, tracking your VO₂ max becomes simpler and more precise. *A Paid Frontier Premium subscription is required to access the full feature set . The Premium feature subscription comes with a complimentary 7 days free trial, and continue at a minimal monthly cost starting from USD 14.99, or opt for an annual plan for substantial savings. Please note that prices may fluctuate based on your geographical location, currency, and current exchange rates The Terms of use are available in the app and our website: https://in.fourthfrontier.com/pages/terms-of-use About Fourth Frontier Fourth Frontier is an innovative health-tech company focused on revolutionizing heart health monitoring with its cutting-edge wearable 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 iPhone and Apple Watch.

Ratings & Reviews

4.6

out of 5

270 Ratings

Incredibly Powerful
05/24/2025

Seymour Fourier
My main passion that I study a lot is cardiology, however I am not a doctor. I have had issues with palpitations in the past and trying to be seen by a condescending cardiologist where I am is insanely difficult. My Frontier X2 has unlocked a door that is mind blowing to me. Being able to monitor my heart on my OWN has been life changing. Of course (thanks to this app) pulling up a live ECG is very impressive to everyone I’ve shown, it is very accurate and useful. I initiated events to record entire workdays and entire nights and the data quality is stellar upon review. I love how quickly it can process 10 hours of data and prepare itself for another session, it’s very efficient. I love the metrics that are calculated for you as well! It’s been very liberating and helped me to reduce my anxiety seeing my heart performing well through all I put it through despite the occasional PVC- which is not concerning to me at this point. This app has allowed me to clearly link it with anxiety. I like being able to mark when I’m stressed or doing different things. The app also works well and hasn’t given me any major issues. The only minor one is needing to be closed and re opened after ending and finishing processing a long activity. If not, the live ECG will not load. This isn’t a complaint though, it’s easy enough to deal with.
Incredibly Powerful
05/24/2025

Seymour Fourier

My main passion that I study a lot is cardiology, however I am not a doctor. I have had issues with palpitations in the past and trying to be seen by a condescending cardiologist where I am is insanely difficult. My Frontier X2 has unlocked a door that is mind blowing to me. Being able to monitor my heart on my OWN has been life changing. Of course (thanks to this app) pulling up a live ECG is very impressive to everyone I’ve shown, it is very accurate and useful. I initiated events to record entire workdays and entire nights and the data quality is stellar upon review. I love how quickly it can process 10 hours of data and prepare itself for another session, it’s very efficient. I love the metrics that are calculated for you as well! It’s been very liberating and helped me to reduce my anxiety seeing my heart performing well through all I put it through despite the occasional PVC- which is not concerning to me at this point. This app has allowed me to clearly link it with anxiety. I like being able to mark when I’m stressed or doing different things. The app also works well and hasn’t given me any major issues. The only minor one is needing to be closed and re opened after ending and finishing processing a long activity. If not, the live ECG will not load. This isn’t a complaint though, it’s easy enough to deal with.
Few issues
12/25/2022

dr-happy
App can't be viewed in landscape which I would like to do on row erg. Device comes with $10 strap that pops off and stops recording. Cool part about that is the app doesn't tell you. When you go to view the ecg tracing it's garbage from the time the little popper connection loosens. And no, you cannot necessarily tell one connection loosened. Device will not connect with PM5 on C2 row erg although it seems to come close. Feel like problem there may be the PM5. Even if it did you can only connect device to 1 Bluetooth thing. You would have to choose rower or phone. So if you want to know your heart rate you have to turn your head on its side.Edit: it does work in landscape now. I almost never get poor signal quality now positioning device slightly left of center. You connect it to PM5 by starting the activity. Then download the data to the app. Cool device cool app

Developer Response
This is to bring to your notice, that we've added an update to the app and it now supports landscape mode, thanks for your feedback!With respect to your PM5, we can help you with that as well over a video call (https://4fsupport.paperform.co) The strap issue should definitely not occur - please reach out to us at support@fourthfrontier.com and we'll immediately send a replacement over. If there's any other issues, you can reach out to us on the same email :)
Few issues
12/25/2022

dr-happy

App can't be viewed in landscape which I would like to do on row erg. Device comes with $10 strap that pops off and stops recording. Cool part about that is the app doesn't tell you. When you go to view the ecg tracing it's garbage from the time the little popper connection loosens. And no, you cannot necessarily tell one connection loosened. Device will not connect with PM5 on C2 row erg although it seems to come close. Feel like problem there may be the PM5. Even if it did you can only connect device to 1 Bluetooth thing. You would have to choose rower or phone. So if you want to know your heart rate you have to turn your head on its side.Edit: it does work in landscape now. I almost never get poor signal quality now positioning device slightly left of center. You connect it to PM5 by starting the activity. Then download the data to the app. Cool device cool app
Developer Response 11/15/2021
This is to bring to your notice, that we've added an update to the app and it now supports landscape mode, thanks for your feedback!With respect to your PM5, we can help you with that as well over a video call (https://4fsupport.paperform.co) The strap issue should definitely not occur - please reach out to us at support@fourthfrontier.com and we'll immediately send a replacement over. If there's any other issues, you can reach out to us on the same email :)
Amazing piece of hardware/software.
08/17/2024

Jason3069
I wanted to get an accurate reading on my HRV at night and this is actually two points higher than my Fitbit charged six. Very nice to know. Also I wear it when I’m cycling. My other device just told me what my heart rate was which was on average for an hour and a half ride 145 to 150 for an hour and a half. The frontier device I can leave on and look at it and when I reach to the maximum heart rate zone, I can stay there as long as I want and then let up to a lower level. I absolutely love this device don’t have any complaints. If you’re thinking about buying it just do it. You’ll love it. Thanks for an amazing product and something that’s so crazy accurate.
Amazing piece of hardware/software.
08/17/2024

Jason3069

I wanted to get an accurate reading on my HRV at night and this is actually two points higher than my Fitbit charged six. Very nice to know. Also I wear it when I’m cycling. My other device just told me what my heart rate was which was on average for an hour and a half ride 145 to 150 for an hour and a half. The frontier device I can leave on and look at it and when I reach to the maximum heart rate zone, I can stay there as long as I want and then let up to a lower level. I absolutely love this device don’t have any complaints. If you’re thinking about buying it just do it. You’ll love it. Thanks for an amazing product and something that’s so crazy accurate.
Good technicals but needs LOTS of work on user interface
01/01/2022

PJBeaumt
UPDATE- I finally got the app to offer me an option to sign up, but it took a few tries. In use the app works well on my iPhone 12 Max Pro, but the biggest peeve is that the numbers for heart rate, distance, etc. are very hard to read on the phone while exercising. THERE IS AN IN-DEPTH REVIEW of the sensor and app at www dot pjfiguresitout dot com. ORIGINAL REVIEW— I spent $250 on this cardiac monitor and I expected a lot. I should have suspected something when the quick start instructions don’t mention downloading the app before telling the user to connect the device to it. What, they expect the app to magically appear on your phone? So I download the app. The app tells me to sign in. THERE IS NO OPTION FOR CREATING A NEW ACCOUNT!!! I even went to the site with my browser, still no option for create new account. For Pete’s sake, people, get some actual professional project managers working on this!
Good technicals but needs LOTS of work on user interface
01/01/2022

PJBeaumt

UPDATE- I finally got the app to offer me an option to sign up, but it took a few tries. In use the app works well on my iPhone 12 Max Pro, but the biggest peeve is that the numbers for heart rate, distance, etc. are very hard to read on the phone while exercising. THERE IS AN IN-DEPTH REVIEW of the sensor and app at www dot pjfiguresitout dot com. ORIGINAL REVIEW— I spent $250 on this cardiac monitor and I expected a lot. I should have suspected something when the quick start instructions don’t mention downloading the app before telling the user to connect the device to it. What, they expect the app to magically appear on your phone? So I download the app. The app tells me to sign in. THERE IS NO OPTION FOR CREATING A NEW ACCOUNT!!! I even went to the site with my browser, still no option for create new account. For Pete’s sake, people, get some actual professional project managers working on this!

Upgrade to a Smarter Home Experience We heard your feedback and here is an all new UI for a smoother experience. Spot Patterns with the New Trends Feature Powerful Trends feature to spot patterns across weeks and months to help you with data backed decisions. Readiness — Reimagined A streamlined flow with clearer guidance, and easy-to-understand results to understand your readiness for the day. Smoother Activity Start The Start Activity screen now offers a cleaner layout and quicker access to the right activity, helping you get moving faster. Performance Improvements Smashed some pesky bugs and did under-the-hood enhancements for a smoother, more reliable experience.