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
Use code WHD25 to get 25% Off
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
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
Real Stories That Inspire Us Trusted by 25K+ Users in 50+ Countries
Easy to use, easier to analyse!
“The Frontier X2 has just given me an incredible level of clarity and detail about my heart during prolonged endurance events and you just can't get that kind of detail with other devices. It helps me dispel fear and uncertainty."
Mark Dutton
(Frontier X2 User)
Easy to use, easier to analyse!
"I like that it has the vibrating alert when I'm going too hard, so I don't need to be looking at my device while I am pedaling and take my eyes off the road."
Elizabeth
(Frontier X2 User)
Easy to use, easier to analyse!
"…Frontier X2 Tracks your inherent abilities and keeps you safe. It's a must have and It's something that I just don't train without anymore…"
Fillip
(Frontier X2 User, Lawyer and Athlete)
Easy to use, easier to analyse!
"the Frontier X2 which helps me monitor what I’m doing and gives better representation of the stress on my heart during various activities"
Darren Mott
(Frontier X2 User, Former FBI Agent)
Easy to use, easier to analyse!
"Frontier X2 has been extremely powerful. Effectively I wear it for all exercise and while sleeping. It’s nice to have a data collection tool that I can put on during those periods.”
Scott Kaintz
(Frontier X2 User)
Easy to use, easier to analyse!
“The first run I had with the device showed me how comfortable, simple, and easy to use it was, but more importantly, it gave me reassurance after years of pushing my body and my heart to its limit, that I hadn’t caused any lasting damage.”
Paula Radcliffe
(Former Women’s World Marathon Record Holder for 16 Years)
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 SignalChest 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.
Who Is It For?
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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.
Continuous Heart Monitoring
Tracks your heart’s electrical signals, breathing, and movement in real time — no gaps, no interruptions, even during intense activity.
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.
Smart Data Transmission
Securely transmits data to the Frontier X
app via Bluetooth, with live dashboards, trends, and workout history always
available.
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.
Features
Advanced Heart Monitoring
Smarter Training
Recovery Optimization
Deeper Heart Insights
Connected & Shareable Data
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.
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.
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.
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.
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.
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
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Measure how efficiently your body uses oxygen during exercise
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Measures when your body shifts from aerobic to anaerobic exercise
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Easily generate, download, and share your ECG reports.
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Live-streaming of continuous ECG & view real-time heart health metrics.
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Get discreet real-time vibration alerts to keep you in the optimal zone.
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Measures cardiovascular strain during any activity.
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Total physiological work based on time spent in various breathing rate zones.
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Evaluates autonomic nervous system health
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Technical Specifications
Fits Right Into Your Ecosystem
What's In The Box
Frontier X2 Device
1x elastic Chest strap
Quick start guide
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.
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 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.
I have had a Fourth Frontier X2 for some time. I am an older athlete. I had some different patterns on the ECG traces during exercise which I wasn't sure about. I raised a question with Fourth Frontier and within an hour got an appointment with one of their medical technicians. On the call she went through all of the patterns explaining what was a trace and what was interference, such as during strength training where chest muscle activity can effect the trace. She also went through very helpfully the other parameters such as HRV, etc.. Really helpful call and hats off to the best customer service I have ever experienced.
I simply cannot recommend both the product and staff highly enough.
G
Gregory Hartman
Incredible Product with even more incredible service
The product, the X2, is amazing and just what I needed as I'm a 72 year old former competetive runner, then cyclist for the last fifty years. I have suffered from Afib for the last nine years and continue to exercise and train as before though having the additional information provided by the X2 is extremely helpful for me and my cardiologist. I am most impressed, however, with the personal attention I've received while this old guy attempts to learn the intricacies of this truly valuable product. I have contacted the company several times during my learning curve and the staff, especially Poonam, has been kind, attentive and patient. Always following up to check that I'm satisfied and things are working to my expectation.
I simply cannot recommend both the product and staff highly enough.
A
Annette Chaplin
Five Star All The Way
Had a great experience with this company, i love the products and the quality of the customer service has just taken it to a long forgotten place, they have been so helpful and attentive in answering all my queries. Customer service is not something we can take for granted, I rarely find it, often not getting responses from companies as they can�t be bothered, not so with Fourth Frontier, their products match their customer service, five star all the way *****
Z
Zedatomic
5 stars and well deserved
5 stars and well deserved. After a few years my FF HRM was becoming problematic. It took a beating so I was not surprised. Just before a major cycling event it stopped recording my ECG. I have some heart challenges so I monitor my ECG carefully. This was a big cycling event in three days. I contacted customer support and they FEDXed a new device to the hotel I was staying at in approximately 24 hours from when I first called them. The customer service rep. Sahid followed up repeatedly with me and made sure the process was flawless! Totally awesome customer service. I got the new device with plenty of time before my cycling event.
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!
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Frontier X2 Smart Heart ECG Monitor | Real Time Wearable Heart Rate Monitoring | ECG Chest Strap Heart Tracker