Continuous Ambulatory ECG & Arrhythmia Analysis

Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus
Frontier X Plus

Pay as low as $43 with Affirm

1-Year Warranty

14-Day Return & Exchange

24/7 Customer Support

Continuous Ambulatory ECG & Arrhythmia Analysis

  • Detect AFib Early: 24/7 Continuous ECG with arrhythmia burden analysis.
  • No Adhesives or Wires: Designed for comfortable wear during exercise, rest, and sleep. No Adhesives or Wires: Designed for comfortable wear during exercise, rest, and sleep.
  • View & Share ECG Reports: Instantly access and share reports with your physician.
  • Weekly Rhythm Insights: Track heart rate and arrhythmia burden over time.
Regular price test2 $649
/

Use code PLUS20 to get 20% Off

  • Detect AFib Early: 24/7 Continuous ECG with arrhythmia burden analysis.
  • No Adhesives or Wires: Designed for comfortable wear during exercise, rest, and sleep. No Adhesives or Wires: Designed for comfortable wear during exercise, rest, and sleep.
  • View & Share ECG Reports: Instantly access and share reports with your physician.
  • Weekly Rhythm Insights: Track heart rate and arrhythmia burden over time.
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HSA/FSA
Eligible

Affirm

As Low As $43
With Affirm

$43/m with Affirm

14 Day Risk Free

14 Day Risk-
Free Trial

24/7 Support

24/7
Support

Free Shipping

Free Shipping
Across The USA

Free Shipping

Have a prescription? Submit the form after purchase; we'll ship upon approval.

Get prescription with our virtual care platform.

Optional add-ons

Weekly Cardiac Rhythm Report – Receive a comprehensive weekly report on your cardiac rhythm, including a detailed analysis of AFib, bradycardia, and tachycardia, learn more.

How The Prescription Works

For "I Need a Prescription": If you don’t have a prescription, you’ll be directed to our physician network (managed by Beluga Health) to complete a medical form after purchasing the device. Once your prescription is approved by a physician, your order will be processed. To learn more, click here.

For "I Have a Prescription": Complete your order and upload your prescription over a secure link. The device will be dispatched once your prescription has been verified. To learn more, click here.

Free add-ons / Shipping

With Frontier X Plus, you’ll receive:

  • 1 Free consultation with our expert
  • Lifetime customer support
  • 1-year warranty for added peace of mind
  • Free Express Delivery
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GJ
Gareth Jenkins
1 reviews   •   NL
Jun 3, 2026
Frontier device provides the best insights into your cardiovascular health and fitness. While I am extremely fit and active, that alone was insufficient. I experience cardiovascular anomalies at times, such as AFib and palpitations, that are related to other aspects of my health. Having a solution that I can trust helps me know that I am managing those other health conditions well.
K
Kevin
4 reviews   •   US
Mar 18, 2026
I didn’t realize how inaccurate and delayed my Apple Watch was in reporting my HR during HIIT and other training sessions. FX Plus has been game changer for me as someone who underwent an ablation for SVT(AVNRT). The peace of mind and confidence this device allows is well worth the cost. Highly recommend.
CA
Carol
10 reviews   •   GB
Mar 18, 2026
This FF device does more than just keep track of vitals during exercise.  have been wearing the device every day, 24 hours a day, since my AFib diagnosis in 2022. I use it to continuously keep track of my heart rate. I do not feel Afib symptoms when they occur.
PS
Partha Srinivasan
1 reviews   •   NL
Mar 18, 2026
I bought Frontier X Plus to monitor PVCs that I was having and try to determine the burden from them over a period of rest and workout activity, walking, etc. It works for 8-10 hours of sleep monitoring or just an hour of interval training or yoga. All the things I cannot do with just my Apple Watch or Whoop.
MC
Mark C
4 reviews   •   US
Mar 18, 2026
I was diagnosed with obstructive sleep apnea (OSA), which likely contributed to my heart rhythm issues. Despite being fit and having what my doctors call an “athlete’s heart,” this had gone undetected for years. I use a Kardia 6L, which is great, but it doesn’t provide the same continuous tracking or depth of data as the Frontier X Plus.

*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.

Measure the
Metrics that Matter

Frontier X Plus Compliance

*Disclaimer: RoHS2 & Reach Compliant chest strap.

WHO IS IT FOR?

When symptoms don't show up at the clinic

AFib or suspected AFib

For people monitoring known or possible atrial fibrillation.

Palpitations

For racing, fluttering, skipped, or irregular heartbeat sensations.

Post-procedure recovery

For people tracking rhythm changes after ablation, angioplasty, bypass, or another cardiac procedure.

Ongoing observation

For people whose physician suggested longer-term ECG monitoring.

Overnight rhythm changes

For people who want visibility into rhythm changes during sleep or rest.

Is Frontier X Plus Right for You?

1. Monitoring Arrhythmias During Exercise

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1. Monitoring Arrhythmias During Exercise

Some arrhythmias may only appear during physical activity. Frontier X Plus helps you monitor your heart rhythm continuously when it matters most.

Benefits

  • Ambulatory ECG monitoring during exercise
  • Early detection of rhythm irregularities
  • Understand activity-related heart rhythm patterns

2. Living with a Heart Condition

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2. Living with a Heart Condition

Frontier X Plus helps individuals with cardiac conditions monitor their heart rhythm continuously and detect irregularities earlier.

Benefits

  • Ambulatory ECG monitoring at home
  • Detect irregular heart rhythms and AFib episodes
  • Share doctor-ready reports remotely

3. Recovering After a Heart Procedure

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3. Recovering After a Heart Procedure

Supports recovery after procedures such as angioplasty, ablation, or bypass surgery by providing Ambulatory ECG monitoring at home.

Benefits

  • Track heart rhythm during recovery and rehab
  • Avoid overexertion with real-time feedback
  • Share recovery progress with your care team

4. Tracking Arrhythmias While You Sleep

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4. Tracking Arrhythmias While You Sleep

Monitor your heart overnight to capture rhythm changes and silent AFib episodes that may go unnoticed during the day.

Benefits

  • Detect arrhythmias during sleep stages
  • Capture ECG data even when symptoms go unnoticed
  • Identify patterns for timely intervention

5. Staying Ahead of Heart Issues

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5. Staying Ahead of Heart Issues

It helps health-conscious individuals proactively monitor their heart rhythm and detect potential issues earlier.

Benefits

  • Identify potential rhythm changes earlier
  • Monitor trends across activity, rest, and sleep
  • Support proactive heart health decisions

Fourth Frontier is Trusted by Leading Cardiologists,
Cardiac Rehab Centers, and Researchers Globally

Fourth Frontier is Trusted by Leading Cardiologists, Cardiac Rehab Centers, and Researchers Globally

30,000+ Users Worldwide
240,000,000+ Minutes of ECG Recorded
50,000+ Events Detected

Beyond traditional cardiac monitoring devices

Features Holter Monitors ECG Patches

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.

$$$$$$
Comparison Table Mobile

What sets Frontier X Plus apart

Detect atrial fibrillation earlier

Continuous ECG for early detection of heart rhythm irregularities.

98.1% sensitivity. 97.88% specificity.

Validated against a 12 lead ECG for clinically reliable heart rhythm detection.

ECG Monitoring during movement

Record ECG while walking, exercising, or going through your routine.

Doctor-ready reports

Get structured cardiac reports that can support conversations with your care team.

Comfortable all-day wear

Wire-free, chest-worn design made for longer monitoring periods.

Rechargeable and reusable

Designed for ongoing monitoring without repeated disposable patches.

Weekly Cardiac Rhythm Report

  • Weekly trends for AFib, Bradycardia, Tachycardia, and more
  • Beat-by-beat rhythm analysis
  • Heart rate irregularity detection and summaries
  • Insights into how exercise, recovery, and sleep impact your heart rhythm
  • 1:1 Cardiac Expert Consultation

Learn More

*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.

Technical Specifications

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What’s in the box

Frontier X Plus device

Frontier X Plus device

2x elastic chest strap

2x elastic chest strap

Quick start guide

Quick start guide

Adapter

Adapter

USB cable

USB cable

How Frontier X Plus Simplifies Medical-Grade ECG Monitoring

Try it for 14 days, risk free

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

Technical Safety and Performance Testing

Frontier X Plus Device

  • IEC 60601-2-47:2014 Medical Electrical Equipment Part 2-47: Particular Requirements for the safety. Including essential performance of ambulatory electrocardiographic systems.
  • IEC 60601-1:2005, AMD1:2012 Medical Electrical equipment - Part 1:General requirements for basic safety and essential performance.
  • IEC 60601-1-2:2014 +AMD1: 2020 CSV, Medical Electrical Equipment - Part 1-2: General requirements for basic safety and essential performance - Collateral standard: Electromagnetic disturbances Requirements and tests.
  • IEC 60601-1-11:2015 Medical Electrical Equipment - Part 1-11: General requirements for basic safety and essential performance - Collateral standard: Requirements for medical electrical equipment and medical electrical systems used in the home healthcare environment.

Chest Strap

  • Compliant with REACH and RoHS2 standards.

Clinical Validation

This study aimed to validate the Frontier X Plus (FX+) single-lead, continuous ECG device by comparing its performance against the traditional FDA Cleared 12-lead ECG in ​832 patients​ in both a clinical and real world setting including individuals with and without atrial fibrillation (AFib). The performance of the Frontier X Plus in detecting atrial fibrillation (AF) demonstrated a sensitivity of 98.10% and a specificity of ​97.88%, when compared to the paired gold standard device as adjudicated by 3 independent cardiologists.

Publications

Roberts, William O. MD, MS, FACSM1; Levine, Benjamin D. MD, FACSM2

A case report of a 16-year-old competitive runner experienced sudden-onset tachycardia episodes, exceeding 200 bpm, were documented using a Garmin Instinct™ watch. Despite normal cardiac evaluations, the patient later used a Frontier X™ ECG Fitness Tracker, which successfully captured heart rhythm data during episodes and helped monitor his response to beta blocker therapy.

Ciara McCormack, Brona Kehoe, Sarah Cullivan, Noel McCaffrey, Sean Gaine, Brian McCullagh, Andrew McCarren, Sarah J Hardcastle, Niall M Moyna

The Frontier X device played a crucial role in continuously monitoring heart rate and respiratory rate, ensuring safety and enabling real-time feedback during the exercise sessions. The success of this remotely delivered intervention suggests that similar models could be effectively implemented for broader PH patient populations, offering a scalable alternative to hospital-based programs.

Frequently Asked Questions (FAQs)

What is Frontier X Plus?

The Frontier X Plus™ by Fourth Frontier® is a wearable ambulatory electrocardiogram (EKG or ECG) recorder and display product that consists of a device affixed to the chest strap, a companion mobile application, and a web application for analysis of ECG. It is a novel, self-applied continuous ambulatory ECG solution for arrhythmia monitoring

The Frontier X Plus system also displays ECG waveform and ECG rhythm analysis; detecting the presence of normal sinus rhythm, atrial fibrillation, bradycardia, tachycardia, inconclusive and unreadable rhythms. The device is intended for use by healthcare professionals to monitor patients with known or suspected heart conditions and health-conscious individuals. It is indicated for use on adult patients who may be asymptomatic or who may suffer from transient symptoms requiring cardiac monitoring. The device is a non-invasive, lightweight, rechargeable battery- operated wireless ambulatory ECG monitor.

Why is early detection of AFib important, and how does Frontier X Plus achieve this?

Early detection of atrial fibrillation (AFib) is crucial for preventing serious cardiac complications. Timely detection allows for early intervention through medication, lifestyle changes, or medical procedures, improving patient outcomes and preventing long-term health issues. The FDA-cleared Frontier X Plus, a chest strap-based heart monitor,  records and transfers single-channel ECG and provides automated
monitoring of atrial fibrillation and other arrhythmias. Frontier X Plus achieves this with exceptional accuracy, boosting 98.10% sensitivity and 97.88% specificity for AFib detection.

How does Frontier X Plus improve patient compliance?

The Frontier X Plus improves patient compliance by offering a lightweight, wearable chest monitor that is comfortable and easy to use. Its real-time data tracking and wireless connectivity provide patients with instant feedback, making them more engaged in their health management. The wearable ECG solution is designed for comfort, encouraging consistent use. Patients can self-apply the device and integrate it effortlessly into their daily routines without disrupting their activities.

What if I already have a prescription?

If you already have a valid prescription, you can proceed to purchase the Frontier X Plus directly. After checkout, you’ll be required to fill out a short form and upload your prescription. Once approved, your device will be prepared for shipment.

What happens if I don’t have a prescription?

If you don’t have a prescription, you’ll be redirected to our physician network (managed by Beluga Health). There, you can purchase the Frontier X Plus and complete a short form with the medical details required to initiate the prescription process.

Once submitted, your information will be securely reviewed by licensed physicians. Once approved, a prescription will be issued, and your order will be processed and shipped.

Who should not use the Frontier X Plus device?

The Frontier X Plus  should not be used by individuals under the age of 22 years, pregnant women, or patients with potentially life-threatening arrhythmias requiring hospitalization or real-time/in-patient monitoring. Additionally, it is not suitable for individuals with known skin allergies to the materials listed in the "List of Patient-Contacting Materials."(mentioned in the Frontier X Plus User Manual.

Can the device be used alongside external cardiac defibrillators or surgical equipment?

No, the device should not be used in combination with external cardiac defibrillators or high-frequency surgical equipment.

What precautions should be taken if using a defibrillator?

Do not use a defibrillator with the Frontier X Plus device, as it may cause damage. Ensure the device is removed from areas where defibrillator electrodes are placed.

Is the device suitable for detecting cardiac conditions like ischemia or myocardial infarction?

No, the Frontier X Plus is not indicated for the detection of cardiac conditions such as ischemia, myocardial infarction, or left ventricular hypertrophy (LVH).

What should be done if the app identifies certain heart conditions as unreadable?

If the app identifies conditions like ventricular flutter, ventricular bigeminy, or ventricular trigeminy as unreadable, consult a physician for further analysis.

Does the Frontier X Plus guarantee the absence of arrhythmias or health conditions?

No, Frontier X Plus does not guarantee the absence of arrhythmias or other health conditions even if an ECG is labeled as normal. Always consult a physician for any potential health changes.

Note:

The Frontier X Plus is a US FDA 510(k) cleared medical device for ambulatory ECG monitoring. It is not tested for use in individuals with pacemakers or ICDs. It is not meant for the diagnosis of cardiac ischemia. Please request the IFU for intended use, indications, contraindications and availability in your geography.

Disclaimer:

All images used are for illustrative purposes only.

The Frontier X Plus ECG monitor is intended to capture, store, transmit and display electrocardiogram (ECG) information for long term monitoring and evaluation. It is intended for use on adult patients who may be asymptomatic or who may suffer from transient symptoms requiring cardiac monitoring such as palpitations, shortness of breath, dizziness, lightheadedness, presyncope, syncope, fatigue, or anxiety. The Frontier X Plus ECG monitor is not intended to provide diagnostic interpretation to the patient. The Frontier X Plus ECG monitor is a prescription-only device, and the reported information is provided for review by a physician to render a diagnosis based on clinical judgment and experience. For the full disclaimer, please visit this link: https://fourthfrontier.com/pages/disclaimers

Frontier X Plus