Our Lowest Price Ever

WORLD'S FIRST SMART HEART MONITOR

Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2
Frontier X2

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14 day risk-free trial

24/7 customer support

Our Lowest Price Ever

WORLD'S FIRST SMART HEART MONITOR

  • 24/7 Continuous ECG during 20+ activities
  • Syncs with Apple Health, Garmin & more via BLE Syncs with Apple Health, Garmin & more via bluetooth 5.0
  • Lightweight. Sweat & water-resistant. (IP67)
  • Superior battery life for 14 days on typical usage
£449
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*14-day money-back guarantee

  • 24/7 Continuous ECG during 20+ activities
  • Syncs with Apple Health, Garmin & more via bluetooth 5.0
  • Lightweight. Sweat & water-resistant. (IP67)
  • Superior battery life for 14 days on typical usage

Use code AFIB25 to get £120 Off

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Frontier X2 v/s Smart Watches & Smart Rings

There’s a reason cardiologists rely on 24 hr ECG readings. Unlike SmartWatches, SmartRings & other HRMs, Frontier X2 provides Continuous ECG with realtime heart health feedback even during exercise, ensuring high signal quality with comprehensive heart health monitoring during any activity.

Optional Add On
  • Frontier Premium Subscription: For the most accurate VO2 Max outside a lab, Zone 2 training with VT1, VT2 Zones, Readiness Score, Oxygen Uptake, and Sleep Stage Analysis, Learn More.
  • HRM Sports Bra: Features integrated electrodes for external heart rate monitors like Garmin, Polar H7, Frontier X2, and more. Moisture-wicking, high-performance fabric, and standard snap compatibility (45mm distance between snaps), Learn More.
Free Add On

With Frontier X2, you’ll receive:

  • 1 Free consultation with our expert
  • Lifetime customer support
  • 1-year warranty for added peace of mind
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Measure the
Metrics that Matter

Why Frontier X2?

45% of heart attacks are silent

You may feel fine until it’s too late. Frontier X2 keeps you connected through continuous heart monitoring, revealing rhythms and changes your body might not show. Understand your heart with every beat, so you can keep living and doing what you love.

*Frontier Premium includes a 7-day risk-free trial with a money-back guarantee if you're not satisfied by the end of the trial period.

Certification

Frontier X2 meets top international standards with 10+ testing certifications

Why Measure From The Chest?

Measure From The Source Your heart's signals are strongest at the chest, giving you more precise readings.

ECG Vs. PPG Chest-worn ECG tracks heart activity directly, unlike wrist PPG, which relies on blood flow changes.

Reduce Noisy Signal Chest placement reduces motion artifacts, giving you cleaner, more reliable data during activity.

Why Measure From The Chest?

Measure From The Source

Your heart's signals are strongest at the chest, giving you more precise readings.

ECG Vs. PPG

Chest-worn ECG tracks heart activity directly, unlike wrist PPG, which relies on blood flow changes.

Reduce Noisy Signal

Chest placement reduces motion artifacts, giving you cleaner, more reliable data during activity.

How It Works

Comfortable Chest Placement

Worn directly over your heart, the Frontier X2 uses a soft, adjustable strap for all-day comfort and accurate readings, even during workouts or sleep.

Comfortable Chest Placement Comfortable Chest Placement

Continuous Heart Monitoring

Tracks your heart’s electrical signals, breathing, and movement in real time — no gaps, no interruptions, even during intense activity.

Continuous Heart Monitoring Continuous Heart Monitoring

Measure What Matters Most

Measure What Matters Most Monitors key metrics like heart rate, HRV, strain, breathing rate, VO2 Max*, & readiness score*, so you understand how your heart responds to stress, effort, and recovery.

Measure What Matters Most Measure What Matters Most

Smart Data Transmission

Securely transmits data to the Frontier X app via Bluetooth, with live dashboards, trends, and workout history always available.

Smart Data Transmission Smart Data Transmission

Generate and share ECG PDF

Generate and share ECG PDF View and share detailed ECG and activity reports from your web dashboard with your healthcare provider for more informed conversations.

Generate and share ECG PDF Generate and share ECG PDF
Comfortable Chest Placement
Continuous Heart Monitoring
Measure What Matters Most
Smart Data Transmission
Generate and share ECG PDF

Features

  • Advanced Heart Monitoring
  • Smarter Training
  • Recovery Optimization
  • Deeper Heart Insights
  • Connected & Shareable Data
High Quality Continuous ECG

Record high-quality ECG for a full day during any activity.

Share real-time heart data with your doctor, coach, or family from anywhere.

Cutting-edge sensors track every beat for precise, real-time insights

Track location with your phone and view ECG variations in the Frontier X app.

High Quality Continuous ECG
Track 20+ Activities

Monitor performance across running, cycling, rowing, hiking, and more.

Customised vibration alerts for HR, BR, and Strain help you train safely and stay within your target zones.

Measure weekly workout stress to balance effort and recovery.

Track impact forces during activity to help reduce strain and lower injury risk.

Measure your endurance capacity outside the lab, with reliable and continuous data.

Target Zone 2 with precision (at or below VT1–VT2) to build aerobic endurance.

Analyse step rate to improve running form, conserve energy, and reduce joint stress.

Track 20+ Activities
Readiness Score

HRV-powered readiness score* helps you train at peak and recover smarter.

Measure heart stress during exercise and daily activity to avoid overexertion.

Track and improve deep, light, and REM sleep quality.

Track stress levels in real time to manage recovery and protect long-term health.

Readiness Score
Activity Tagging & Notes

Share notes and add tags during workouts to link lifestyle, choices, and performance.

See how time in each zone impacts your fitness and recovery.

Review daily, weekly, and monthly trends for key heart metrics.

Get tailored advice to train smarter and safer.

Activity Tagging & Notes
Multi-Device Connectivity

Pair with your smartwatch, cycling computer, or fitness apps.

Works with Apple Health, Google Fit, Strava, TrainingPeaks, Zwift, Wahoo, Garmin and more.

Seamlessly update all your metrics across the Frontier X App and the web dashboard.

Send full ECG and heart health reports to your doctor or coach.

Multi-Device Connectivity

Go Beyond Heart Rate Monitors & Smartwatches

Features FRONTIER X2 Heart Rate Monitor Smart Watch Smart Ring

Monitor your heart health with a high-quality Continuous ECG 24/7 in real-time.

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Captures heart health data with live ECG while you train.

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Measures stress on joints and musculoskeletal system

×××

Measure how efficiently your body uses oxygen during exercise

×××

Measures when your body shifts from aerobic to anaerobic exercise

×××

Easily generate, download, and share your ECG reports.

×××

Live-streaming of continuous ECG & view real-time heart health metrics.

×××

Get discreet real-time vibration alerts to keep you in the optimal zone.

×××

Measures cardiovascular strain during any activity.

×××

Total physiological work based on time spent in various breathing rate zones.

×××

Evaluates autonomic nervous system health

Comparison Table Mobile

Technical Specifications

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Mobile Top Image
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Fits Right Into Your Ecosystem

What's In The Box

Frontier X2 Device

Frontier X2 Device

1x elastic Chest strap

1x elastic Chest strap

Quick start guide

Quick start guide

USB cable

USB cable

Spotlight Stories

Inspiring heart health journeys shared by our community members.

Try it for 14 days, risk free

Frontier X2 comes with a 14-day money back guarantee and 1-year warranty.

Frequently Asked Questions (FAQs)

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 ECG during exercise.

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

The Frontier 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 ECG in real-time to anyone at anytime as well.

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

Most devices on the market that allow you to record ECG are either watches or hand-held. Hand-held and Watch ECGs 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 ECG is being acquired from the finger or wrist, instead of the chest. Further, they typically record only 30-60 second segments of ECG and do not allow for long continuous recordings like the Frontier X2.

With the ability to record up to 24hrs of continuous ECG 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 ECG from the skin just over the heart, the Frontier X2 can pick up minute electrical changes that may be lost if the ECG is picked up from points further away, like the arm, wrist or fingertips.

How does the Frontier X2 help keep your heart safe?

The Frontier X2 measures changes in your ECG, which may indicate oxygen deprivation and heart muscle damage. The device subsequently provides your 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 ECG measured by the Frontier X2?

The ECG obtained from the Frontier X2 resembles the V5 lead position of a 12-Lead ECG. The quality of the ECG 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 X2 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 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 ECG (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 Frontier 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 meter (approx. 3 ft) of water for 30 minutes.

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.

Frontier X2 or Frontier X Plus: How do I find the right fit for me?

To understand the differences between Frontier X2 and Frontier X Plus, click on this link.

Is the Frontier X2 a medical device?

The Frontier X2 is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease or medical condition. It is designed for general wellness purposes only and provides fitness and performance insights. Any health-related information provided by the device is for informational purposes only and should not be considered medical advice. Please consult a qualified healthcare professional before making any changes to your health or fitness regimen.

Disclaimer : The Frontier X2 is not a medical device and does not diagnose or treat medical conditions. It is intended for general wellness, fitness, and performance insights. Always consult a healthcare professional before making changes to your health or fitness routine.

Customer Reviews

Based on 455 reviews
80%
(366)
10%
(46)
4%
(17)
4%
(16)
2%
(10)
L
Leonardo Sperle Ferreira Lage
Client services is amazing

Client services is amazing. I had a technical issue with my device, I don't live in any of the countries serviced but they managed to send whatever I needed to me. Great experience!

R
Richard Strauss
Ultimate accuracy and convenience

Review content- The X plus provides truly a medical grade ECG. I am a physician with both atrial and ventricular arrhythmias. The X plus provides a comfortable and accurate way to monitor 24 hour ECGs both during activity and sleep. It is both more convenient and gives a better read than electrode based systems that I have used, which often fall off or cause skin irritation.

P
Patrick Salvatore
Experience with the X2 device & the premium subscription

I had provided a 3 star review earlier difficulty working on a product Demo. My errors WRT to that review were due to use of a New PC and using a smartphone as a camera. A bad combination which has been corrected. More importantly I want to speak about my satisfaction with the X2 Heart Monitor Strap and the advanced software subscription. I bought this device for better details and health safety risk profiling, during self regulated cardio-pulmonary rehabilitation. I have logged 17 work outs across 18 days with the X2. X2 performs exceptionally well. I wear it properly and assure good skin contact. All device aspects, including charging, Bluetooth use perform extremely well. The advanced software subscription, properly ports data sets out and detailed analysis reports back seamlessly & timelessly over normal cell phone bandwidth of 1 to 2 bar cell strength. Since I am primarily working from Pulmonary limitations (as a reason for rehab) the generated metrics for V02 max and V0 bands and also cardiac pulse rate data. The cardiac pace on the interface matches (to within a beat with APPLE Watch heart rate & the sensors in grips on the high end "Lifefitness" treadmills. The picture developed by fourt frontier and software is very complete. The subscription price is well-worth the investment for the refined analysis it provides. The phone application interface is extremely easy to use, and to annotate remarks. Even the availability to publish a web link to share a good look at work out data, are easily studied by others. It supplements the excellent more detailed presentation available on the smartphone. In these 18 days of use, I can't think of anything else needed for their package. It is also worth noting that all of the agents who were working to support the X2 Demo, and also a discussion around X+ (soon to be released) bent over backwards to try and help me with my connectivity issue to see their demos and discussions. Kudo's to their group. I feel like, within their organization, I could get support and help if it were ever needed. If you are looking for a comprehensive device to support your understanding of workouts / work loads for cardiac functional safety this its a great solution. The buy-in price for an X2 a year with all elements, is significantly lower in price than any monthly sessions from "sports medical office-controlled" cardio-pulmonary rehabilitation, or advanced sport coaching engagements. With the advantage that you own your own schedule and selection of activities. The safety net the device provides is priceless. The Premium subscription gives detailed metrics, detailed analysis, the summary guidance gives just the right constructive considerations that should apply to improving one's fitness goals. Well done Forth Frontier !!!! This company and their principals will own this space for years to come, because of the pursuit of advanced AI work inside the device, and through their gateway that serves back the processed data.

F
Fourth Frontier User
Best Heart Rate Monitor

Had my doubts on the Frontier X but after a week of wearing it and using the device best decision ever made and worth the money I highly recommended to anyone who wants to up their endurance and need to see how far they can push there body.

R
Ron Kimura
Pacemaker recovery with A-fib

As an 81 year old former triathlete, skier, tennis player and golfer, I recently had a pacemaker implanted which resulted in complications (pericarditis--inflammation of the area around the heart) and hospitalization for almost a week. Part of the reason for the pacemaker was A-fib (bradycardia--low heart rate); unfortunately the a-fib is still a problem that might require another procedure (Farapulse) which I'm in discussion with an electrophysiologist and a cardiologist. Fortunately with the Frontier X2 I am able to gather ECG and A-fib workout data for my physician's assessment. The predominant data of interest is my A-fib "load"--the amount of time my heart is experiencing Afib while I'm working out. In the weeks and months ahead I'll be gathering data during sleep, workouts, and rest--and presenting it to my electrophysiologist and cardiologist to determine whether I'm a candidate for either the Farapulse procedure, or if medication is a better alternative. Thanks to my Frontier X2 we'll be able to base our decision on facts vs subjective "feelings." In addition, I am able to regain my former strength and endurance without concern that I'm overdoing it and putting undue strain on my heart--my Frontier X2 is a game changer.