Anonymous
The response to my inquiry was prompt…
The response to my inquiry was prompt and thorough
Response from Fourth FrontierMar 25, 2026
Thank you for your kind words! Glad we could respond quickly and provide the clarity you needed 😊

Fourth Frontier is a pioneering health tech company that builds and offers products and services for monitoring and improving heart health for people across the world. ------------------------------------------------- Frontier X2, our revolutionary patented product that provides real-time feedback on heart health to users on the move. Take control of your hearth health with the world's first smart heart monitor.If you need more information on our device and would like to speak to one of us regarding that, please book a demo call.Book a demoCalculate your heart score and get personalized insightsTake our quiz
Fourth Frontier (fourthfrontier.com) has 371 customer reviews on Five Star Index, with an average rating of 4.4 out of 5.
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Anonymous
The response to my inquiry was prompt and thorough
Response from Fourth FrontierMar 25, 2026
Thank you for your kind words! Glad we could respond quickly and provide the clarity you needed 😊
Hajo B.
Nach mehreren Episoden an Vorhofflimmern habe ich mir den Frontier X2 zugelegt. Ich freue mich über die Beruhigung mögliche Episoden während Trainingseinheiten oder im Schlaf auch diagnostisch erfassen zu können und den behandelnden Ärzten ein 1-Kanal EKG zur Verfügung stellen zu können. Den Support habe ich jetzt zweimal in Anspruch genommen - beide Male schnelle und lösungorientierte Unterstützung bekommen. Klare Empfehlung.
Response from Fourth FrontierMar 25, 2026
Thank you so much for sharing your experience! We’re really glad the device is giving you peace of mind and helping you track episodes when it matters most. Great to hear our support team could help you quickly as well. We truly appreciate the recommendation 😊
Thomas F.
Very friendly, kind and customer focused support. My technical issue was picked up and solved very quickly.
Response from Fourth FrontierMar 25, 2026
Thank you so much for your kind words! Really glad we could resolve your issue quickly — our team always aims to be as helpful and responsive as possible. We’re here anytime you need us 😊
Stuart C.
Excellent product, I had Afib and it helped me to understand which activities brought it on, sleeping and exercising in my case. This also helped me make the decision between medication and ablation. Customer service is also top notch. Quick response times very knowledgeable.
Response from Fourth FrontierMar 25, 2026
Thank you so much for sharing this — it really means a lot to us. We’re glad the device could help you understand your triggers better and support such an important decision. Also great to hear your kind words about our support team 😊 Always here if you need anything!
Gareth J.
I’ve been using the FrontierX HR monitor for nearly 6 months. Firstly to track a mild exercise induced atrial arrhythmia which I then shared with the cardiologist who was then able to diagnose together with stress ECG. Secondly to better define my training zones via breathing rate / metabolic analysis for VT1 and VT2 for triathlon. I used the online fourth frontier analysis tool together with my own ramp tests and FTP tests to nail my “easy”, “moderate” and “hard” intensity zones with power, heart rate and breathing. Very powerful- to the extent that pro-cycling teams are doing this now. Easy is now easy and hard is hard. No straying into grey moderate workouts. This helps to recover faster and maintain training load. I’ve had a few issues - mainly software and reboots - but customer service is really fast and very high quality in terms of troubleshooting and fixes. Given the accuracy and precision of the monitor I’m amazed at how small, durable (I’m a heavy sweater) and robust it is. Overall very good!
Response from Fourth FrontierMar 20, 2026
Thank you for the detailed review and for sharing your experience. We’re really glad to hear the device has helped both with capturing ECG data for your cardiologist and refining your training zones. It’s also great to know our support team was able to assist you promptly when needed. We truly appreciate your support!
Gary A.
I bought the X plus with the goal of full-time AF monitoring. I run frequently and wanted to know if arrhythmias were related to exercise as well. I have been disappointed in both, but mostly for running. Almost every run, the X plus wil start out recording, then show “unrecordable” or will be unable to interpret the rhythm, “indeterminate”. I have abandoned the X plus and now wear my Apple Watch 24/7 and it gives me Afib burden. This is more useful than the X plus. X plus is a great idea gone awry: great hopes but poor delivery. Support suggestions were not of much use. My Apple Watch has been much more reliable, even though Apple Watch does not monitor full-time and could miss a brief AF episode.
Response from Fourth FrontierMar 16, 2026
Thank you for sharing your feedback, and we are sorry to hear that your experience during runs has not met your expectations. One of our customer support team members will reach out to you shortly to review your recordings and assist you further. We truly appreciate you taking the time to share your experience.
Don
This device probably saved my life. The doctors were dismissing my concerns until I gave them hard evidence. The support group is really helpful. I gave them 4 stars for two reasons. One, the android app is buggy. Sometimes it connects to the chest strap connects right away, sometimes it doesn't. Sometimes the app is responsive and sometimes it freezes up. The other reason for losing a star is the marketing. I was under the impression that more features were available without a premium subscription. I am tired of tech companies always telling you all the great things they do only for you to find out it costs more money.
Response from Fourth FrontierMar 9, 2026
Thank you for sharing your experience. We’re really glad to hear that the device helped you capture data that supported discussions with your doctors, and that you’ve found the support team helpful. We also appreciate your feedback regarding the Android app and the subscription messaging. Your feedback has been forwarded to our team as we continue working on improving the app experience. If you ever need assistance, please feel free to reach out to our support team. We’re always happy to help.
IBRAIZ S.
Amazing product. With a ECG during workouts gives a lot of insights to the heart.
Response from Fourth FrontierMar 2, 2026
Thank you for your wonderful feedback! We’re thrilled to hear that the ECG feature during workouts is providing meaningful insights into your heart performance. Helping you better understand your body and train with confidence is exactly what we aim for. We truly appreciate you taking the time to share your experience!