Dr Mitshu D.
Good
Good product
Response from Fourth FrontierSep 7, 2026
Thank you for your feedback! We’re glad you’re enjoying the product and appreciate your support 😊

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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Dr Mitshu D.
Good product
Response from Fourth FrontierSep 7, 2026
Thank you for your feedback! We’re glad you’re enjoying the product and appreciate your support 😊
MICHAEL A.
I have been an on and off user for a little over a year. I have wondered if I have a unit that is malfunctioning, so consider that as you read my review. My strap seems to have a hard time connecting with my training computer on my bike and by windows machine hooked to my wahoo smart trainer bike. This is the smaller of my issues as bluetooth can be glitchy with anything. My second issue is that it has a hard time getting my ECG data and when it does, a lot of it is not readable according to Fourth Frontier. In fact, last December they contacted me to let me know there was an issue. They suggested ways to make improvements with the contacts, but it still seems to have the problem. I really love the idea of this heart rate monitor, but right now it is too expensive for too many frustrations. I hope they do get this right, but I won't be buying the new upgraded one. As can be seen Fourth Frontier did indeed contact me. I am unsure of what they did, but once I gave them permission to access my data, all of my data was readable. This was data spread over several months. They feel like it was a glitch in my device, that somehow reset. I obviously feel that it was something in the way the data was processed. Either way, the device is working and I am pleased! I do wish we could have fixed it the first two times that I contacted them, but it does have a happy ending. Kudos to them for their persistence.
Response from Fourth FrontierAug 20, 2026
Thank you for sharing your detailed feedback. We’re sorry to hear about the connectivity and ECG recording issues you’ve experienced. We understand how frustrating this can be, especially when you see the potential of the product. One of our team members will reach out to better understand the issues and see how we can assist. We appreciate your honest feedback and hope we can improve your experience.
Nabil K.
Amazing support team. Swift reply
Response from Fourth FrontierAug 20, 2026
Thank you so much for your kind words! We’re glad you had a great experience with our support team. We really appreciate your feedback 😊
Christopher R.
Exceptional Customer Support and Service I want to express my sincere appreciation for the team at Fourth Frontier. When my original X2 heart monitoring device stopped working properly, it was already out of warranty. Despite that, their customer support team went above and beyond the call of duty to help me resolve the issue. They worked directly with me to troubleshoot the problem, allowed me to test a replacement device to ensure it worked better for my needs, and ultimately provided a refurbished device. Their willingness to support their customers—even past the warranty period—is rare. They made every effort possible to make things right, and the new device is working great. Thank you to the Fourth Frontier team for their outstanding service and dedication! I highly recommend them if you need more than a standard heart monitor for exercise.
Response from Fourth FrontierAug 20, 2026
Thank you so much for sharing your experience! We’re really glad our team could help get you back up and running, and that the replacement device is working well. Your kind words about our support team mean a lot to us. We truly appreciate your recommendation! 😊
Chet J.
This is a perfectly good HR monitor, and the ECG feature is definitely nice. But the other metrics, such as VO2 max and HRV are just laughable. IF you want those features, move on. If you want a HR & ECG tool, go for it. They have confirmed with me that the do not "measure" VO2 Max, or VO2 peak - they estimate it based on your personal data. I can literally increase or decrease my VO2 scores by changing my age within the app. That's pretty useless, since my actual Volume of O2 used did not change just because my age changed. Basically, except for the ECG feature, I can get any HR monitor and any number of websites to make up a VO2 number just as well as 4th Frontier. My bad for thinking this would be a good tool for that, and I wish I had done more research before I spent this much money and the paid for the premium subscription. I have since canceled that, and now the device is my back-up HR strap - it's actually the back up to my back up, since the X2 is the biggest and clunkiest HR strap/device I've seen since the earliest days of HR monitors in the 80s.
Response from Fourth FrontierAug 20, 2026
Thank you for sharing your feedback. We understand your concerns regarding the metrics and would like to provide some further clarity. One of our team members will be reaching out to you shortly to discuss your concerns and assist you further. We appreciate you taking the time to share your experience.
manish P.
I want to sincerely thank the Fourth Frontier team for their exceptional support. I recently ran into a software issue with my device, and the team went above and beyond to help. Not only did they attentively listen to my problem and resolve it completely, but they were also accessible throughout the entire process—keeping me updated every step of the way. Their service is superfast, reliable, and thorough. I highly recommend Fourth Frontier to any athlete looking for a hassle-free pre- and post-sale experience so they can keep their focus on their training.
Response from Fourth FrontierAug 20, 2026
Thank you so much for your kind words! We’re really glad our team could help resolve the issue and keep you updated throughout the process. We truly appreciate your recommendation and support 😊
Reviewer
Initially the device wouldn't work. Even the customer service people couldn't get it working. After a while I managed to find a workaround on my own and if you have this kind of problem, it seems to me that it may be a glitch with their servers. Anyway I installed the application on a different phone and that suddenly worked. Then when I went back to the original phone it also started working. The system seems to work as it should but I have to start using it properly over the next weeks. Very disappointed that the original review which I posted on their website explaining that the system didn't work and giving them only one star – was censored and removed by the company. This speaks to a lack of transparency and integrity and it suggests that the excellent reviews that they carry on their website may not be a reliable indicator of customer satisfaction in this item. What a shame
Response from Fourth FrontierAug 20, 2026
Thank you for sharing your experience. We’re sorry you initially faced difficulties getting the device working and understand your concerns. We’re glad you were eventually able to get it up and running. One of our team members will reach out to better understand what happened and assist you further. We also appreciate your feedback regarding the review experience.
Charles
Very fast and friendly communication. They are transparent in their responses and professional in handling inquiries and/or complaints. The way Fourth Frontier handles communication is simply amazing.
Response from Fourth FrontierAug 7, 2026
Thank you so much for your kind words! We're delighted to hear you had a positive experience with our team. We truly appreciate your feedback and your support—it means a lot to us.