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Frontier X2

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Regular price $449
Regular price $549 Sale price $449 🔥 Valid Until 29th May Sold out

No cost

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Delivers within 2-3 days* in USA

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1 Year Limited Warranty

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"Heart rate only tells you how many times your heart is beating. Frontier X2 has continuous EKG feature to monitor your heart health beyond Heart Rate and guides you to a stronger, healthier heart."


Science Backed Metrics

Get accurate reliable data trusted by experts to guide your progress.

Review and share detailed workout data

See your entire ECG and correlate it with your breathing rate, heart rate, strain and activity.

AI-Enabled Algorithms

Continuously evolving advanced algorithms that bring together the best of cardiac science and AI.


Heart Rate



Real-Time Alerts

Continuous EKG

EKG During Exercise

EKG Spot Check

Remote Sharing

Frontier X2 Features
  • Accurately record continuous EKG for up to 24hrs during any activity (including sleep).
  • Spot changes in your rhythm with AI generated Cardiac Rhythm markers.
  • Avoid overstraining your heart by combining your HR with Cardiac 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 behaviour affect your heart health.
  • Accurately assess your true effort with our proprietary Breathing Rate algorithm.
  • Share your EKG & other metrics instantly and securely with anyone across the world.
  • Simultaneously connect to upto 2 external HRM devices that use Bluetooth Low Energy/Bluetooth Smart.
  • AI enabled algorithms - Receive post-activity training insights, recommendations, and weekly goals.
FRONTIER X2 Specifications


  • Heart: Heart Rate, Rhythm, Strain, HRV (Heart Rate Variability)
  • Performance: Breathing Rate, Training Load, Body Shock, Step Cadence


  • Weight: 25 grams
  • Dimensions: 73mm x 24mm x 13mm
  • Water resistant up to 1.5 meters


  • Upto 24 hours of continuous usage; 12 - 15 days under typical usage
  • Full charge in under 45 minutes


  • Frontier X2 now has Bluetooth 5.0 for 3X speed and greater range.
  • Frontier X App available for iOS and Android phones, as well as the Apple Watch
  • Displays Heart Rate on compatible BLE sports watches


  • Frontier X2, 2 x Elastic Chest Straps, Micro USB Cable, 2 x Micro USB Rubber Covers, Quick Start Guide

What people are saying

We're highly rated, view our other reviews on Trustpilot & Amazon

Frontier X2 Certifications

Frontier X2 is manufactured in accordance with the highest international standards.

Frontier X2 Integrations

The Frontier X2 uses Bluetooth Low Energy (BLE) technology to sync with third-party devices and provide Heart Rate data in real-time. That means you can train distraction-free with the device you already own without losing out the Frontier X2 metrics.

All Features

High Quality ECG

Continuous ECG up to 24 hours

The world's first and only consumer wearable that allows you to record high-quality ECG in real-time for upto 24hrs during any activity.

Real time, live ECG streaming

Share your Live ECG in real-time with experts, family, or friends, whenever you want, wherever you want, even while exercising!

Detailed ECG graphs

The Frontier X2’s patented ECG technology gives you the unique ability to record up to 24 hours of highly detailed, accurate data through any activity of your choice!

Route maps witn ECG

Correlate your ECG data with your GPS data to gain unrecedeted insights into your ECG response to pace, elevation, intensity and distance.

Heart Health Metrics

Accurate Chest-Based Heart Rate

Track accurate chest-based Heart Rate through sleep, rest or exercise and get detailed post-activity insights.

Heart Rate Variability (HRV)

Get insights into how your body manages stress and recovery and by measuing your HRV before and after workouts.

Stay Safe with Strain monitoring

‘Strain’ measures the amount of oxygen deprivation experienced by your heart. Manage training intensity to avoid high strain on your heart for prolonged periods.

Heart Rhythm Chart

Get a heart rhythm chart identifying deviations from the norm, with data explaining the duration, frequency, and occasions when these rhythms occurred.

Heart Health Insights

Activity Tagging & Health Entries

Frontier X2 allows you to capture key events, feelings, or choices in your day to help better understand the response of your heart health to those aspects.

Heart Rate Zone Training

Training in different Heart Rate Zones achieves different goals. Frontier X2 ensures you stay within your chosen zone so your goals are achieved most efficiently

Monitor progress over time

Analyse the daily, weekly, and monthly progression of all key heart metrics including HR, BR, Strain, and HRV.

Detailed physiological graphs

Use our dynamic web dashboard to view detailed graphic representations of all the physiological metrics measured by the Frontier X2.

Heart Rate Zone Insights

Use our dynamic web dashboard to view detailed graphic representations of all the physiological metrics measured by the Frontier X2.

AI-generated recommendations

Push yourself safely with personalized workout insights and AI-generated recommendations for future workouts.

Exercise and Training

Monitor 20 types of activities

Track and analyse 20 different types of activities, including running, cycling, meditation, sleep, rest, swimming, trekking etc

Effortless zone based training

Set real-time vibration alerts for a range of metrics so you stay within the right workout zone without needing to look at your phone or smartwatch.

Train without distraction

Use the Frontier X2 without connecting it to the mobile app. Review all your physiological metrics without repeated glances at your phone or smartwatch.

Real-time vibration alerts

Train with confidence knowing your heart is protected. Set custom alerts to give you real time feedback when you’re overstraining yourself.

Light, sturdy and durable

The Frontier X2 is so light that you’ll barely feel it on you, but also so durable that no activity is off limits!


The Frontier X2 is IP67 rated - waterproof and sweatproof up to 1.5 meters. Perfect for swimming!

Performance Insights

Sustainable Training with Training Load

Get a true estimate of total exertion during any activity. Weekly training load goals help ensure you’re improving your performance without over-training.

Prevent injury by monitoring Body Shock

Monitor your Body Shock to analyse the impact of running surfaces, gear, form changes or fatigue, helping prevent injuries during high impact activities.

Step Cadence

Measure the number of steps taken per minute while running to get additional insights into your running, walking or hiking performance.


Bluetooth 5.0 connectivity

Sync with external devices (Apple Watches, Garmins, Pelotons, Zwifts, and more) as an HRM via Bluetooth Low Energy.

Integrate with your favorite Apps

Connect the Frontier X2 to external apps in your exercise ecosystem, including Apple Health, Google Fit, Garmin, and Strava.

Sync your data across apps

Automatically sync your health and workout data from your favorite apps through Apple Health, Google Fit, Garmin, and Strava.

Simultaneous multi-device connectivity

Now connect the Frontier X2 to 3 devices at the same time as an HRM

Share your data

Securely share your data

Instantly share Frontier X2 data using a secure link so your doctor, family, or friends can stay worry free, always!

Unlimited, unrestricted downloads

Download a .FIT file of your activity summary to upload on to other platforms like Strava.

On-device memory of 24 hours

Frontier X2's on-device memory can store ECG recordings for up to 24 continuous hours, making it perfect for constant monitoring.

Unlimited cloud storage

Get unlimited storage in your own free cloud account. Get lifetime access to 1000s of hours of ECG recordings and analysis.

Share PDF reports

Download a .PDF file of your continuous ECG to either analyse yourself, or easily share with an expert.

Onboarding and Support

Get a Free Demo

Get a Free Virtual Demo upon purchasing the Frontier X2 to learn all about the device and its variety of features.

Complimentary consultation

Receive personalised insights on your training and heart health from a heart health coach who will review your Frontier X2 data and provide personalised guidance.

Lifetime 24x7 support

24x7 support available via email (, live chat on our website or mobile app, or by dialling in to our toll free number.

Engage with our community

Engage with thousands of our community members, sharing stories, workouts, and recommendations in your journey towards better heart health.

Quick and easy onboarding

Get in-app onboarding and an easy to use knowledge base to get familiar and comfortable with all of the Frontier X2 features.

Quick Start User manual

Download a PDF version of the user manual by clicking here, if the step-by-step online manual isn't for you.


Frontier X2 comes with a 30-day risk-free money back guarantee and 1 Year Limited Warranty.

Add To Cart


What makes the Frontier X2 unique?

What makes the Frontier X2 so much more advanced than a regular Heart Rate Monitor?

The Frontier X2 is the World’s First Smart Heart Monitor that allows you to record your EKG during exercise.

Unlike a regular heart rate monitor, which typically only transmits heart rate, the Frontier X2 records, stores, and processes your EKG (while exercising or stationary, both), Heart Rate, Strain, Breathing Rate, as well as biomechanical parameters like Cadence (step rate) and Body Shock.

The X2 can also give you real-time feedback through vibration alerts, when you cross preset thresholds for Heart Rate, Breathing Rate and Strain. Moreover, you can transmit the physiological metrics recorded on the Frontier X2 to anyone across the world, in real-time. This includes the ability to live-stream your EKG in real-time to anyone at anytime as well.

How does the Frontier X2 compare with other EKG devices on the market?

Most devices in the market that allow you to record EKG are either watches or hand-held. Hand-held and Watch EKGs require you to sit still and hold the device with both hands, so they cannot be used during exercise. They also suffer from poor data quality, because the EKG is being acquired from the finger or wrist, instead of the chest. Further, they typically record only 30-60 second segments of EKG and do not allow for long continuous recordings like the Frontier X2.

With the ability to record up to 24hrs of continuous EKG data, the Frontier X2 was designed to get the best quality metrics while on the move, in any environment. The chest-worn design keeps your hands free for sport and is tightly fastened to ensure good data quality during motion. By collecting the EKG from the skin just over the heart, the Frontier X2 can pick up minute electrical changes that may be lost if the EKG is picked up from points further away, like the arm, wrist or fingertips.The EKG quality on the X2 has been validated against a GE Holter Monitor and most closely resembles the V5 lead position of a 12-Lead EKG.

How does the Frontier X2 help keep your heart safe?

The Frontier X2 measures changes in your EkG, indicating oxygen deprivation and heart muscle damage. The device subsequently provides your Cardiac Strain values in
real-time on our app. It also warns you with a double-vibration alert if you cross your pre-set threshold, helping you exercise at an exercise
intensity that is safe for your heart. This alert can tell you whether
you should finish the last lap, run that extra mile, do those last few
push ups, or just give your heart a rest.

How does the Frontier X2 help improve your performance?

The Frontier X2 measures both, Breathing Rate and Heart Rate. Breathing rate is much more closely correlated with your true internal effort than heart rate, because unlike heart rate, it is not influenced by external factors like caffeine, lack of sleep, temperature, humidity and stress, which are some of the problems with heart rate based training. The Breathing Rate based alerts on the Frontier X2 tell you when to speed up and when to slow down, enabling you to optimize your performance.

How accurate is the EKG measured by the Frontier X2?

The EkG obtained from the Frontier X2 resembles the V5 lead position of a 12-Lead EkG. The quality of the EkG has been validated against a GE Holter Monitor.

Please note the Frontier X2 is a health & fitness product, and is not intended to be used for diagnostic or treatment purposes. Please read our detailed disclaimers here.

Is the Frontier X2 compatible with other external Heart Rate Monitors?

​The Frontier X uses Bluetooth Low Energy (BLE) Technology/Bluetooth Smart to sync with other devices as a heart rate monitor. These devices include certain models of ​Apple Watches, Garmins, Whoop Straps, Pelotons, Zwifts and more. If your external device is equipped with BLE/Bluetooth Smart technology, the Frontier X2 should easily sync as a heart rate monitor (HRM) with no issues whatsoever. 

The Frontier X2 can simultaneously connect to a maximum of 3 devices - 1 Mobile App & 2 External HRMs.

While the external device will only reflect Heart Rate, the Frontier X2 itself will reflect various metrics such as EKG (live and recorded), Breathing Rate, Strain, Heart Rate, Body Shock, and Training Load once it is connected to the mobile app, post your workout. You can see a more detailed view on the Frontier X web dashboard as well, once you've uploaded data from your device to the cloud.

Please note that the Frontier X2 does not support ANT+.

Is the Frontier X2 compatible with other third-party fitness apps like Strava or Training Peaks?

There is currently no direct integration between the Frontier X2 and these fitness apps. However, there are a couple of workarounds.

When the Frontier X2 is connected to your phone/apple watch app and the phone/watch is carried along - it allows you to record GPS data as part of your workouts as well. The Frontier X2 doesn't have a GPS chip of its own, and thus uses the phone's/watch's GPS. You can then download a .FIT file of your workout from the Frontier X2 dashboard and upload it to apps like Strava, Training Peaks, JeFit etc. for further analysis. 

Alternatively, you can connect the Frontier X2 to an external HRM like a Garmin or Polar and then pass the information on to Strava or Training Peaks from your external HRM. The data uploaded onto Strava in this case will include the Heart Rate measured by the Frontier X2.

What is the battery life of the Frontier X2?

A fully charged Frontier X2 can last for up to 24 hours when recording data continuously and 14 days if used for an average of 1 hr/day.

Can I use the Frontier X2 without it being connected to my phone?

Yes. You can record data on the Frontier X2 without connecting the device to the mobile app. The X2 is equipped with a memory chip, unlike most other devices on the market. This ensures that even if you don't connect it to your phone during your workout, or choose to connect it to an external device like Garmin, there's zero data loss as you can come back home and connect the Frontier X2 to the phone later. Once synced, all metrics recorded on the device will be accessible.

Is the Frontier X2 waterproof?

Swimming is one of the most common use cases of the Frontier X2. The Frontier X2 is IP67 rated, which means that it is completely waterproof for up to 1.5 meters (approx. 5 ft).

Can the Frontier X2 be worn while exercising or playing sports?

Yes. The chest-worn design of the Frontier X2 keeps your hands free for sport and is tightly fastened to ensure good data quality during motion.

Can you use the Frontier X2 with a pacemaker?

While Frontier X2 has not gone through the official safety testing for use with pacemakers, we have several users who use the device with pacemakers. None of these users have reported any issues.

What is your policy for FSA/HSA?

We may support FSA/HSA. By interacting with some of our existing users, we found that the Frontier X2 product can be covered by FSA/HSA. We regret not having the FSA authorization from the US yet, but one of our users who has used HSA to purchase our product has provided some valuable feedback:

“I felt that if my medical insurance would be willing to pay for a Holter Monitor, they should be willing to pay for an FX! So rather than jump through all of the hoops and paperwork I'd have to do, for a product that is not yet medically approved/licensed, I decided to buy an FX myself and charge it to my Health Savings Account."

When trying to purchase and charge the FX on my Optum debit card, the $500 was denied (possibly because Fourth Frontier is not a recognized or approved product/service). So, I then just purchased the FX with my personal credit card, and reimbursed myself from my Optum HSA after filling out an online form explaining what and why the FX was needed. Having included the receipt of payment, the expense was approved and the reimbursement was received a day later. This whole process all happened within 24 hours”.