Fourth FrontierReviews of fourthfrontier.com

I bought this (Frontier X Plus) to monitor PVCs that I was having and try to determin the burden from them over period of rest and workout activity, walking etc. My physician ordered a 2 week patch monitor which did not come even after two weeks. I ordered this and had it up and running in a week and it works as advertised. They only classify PVCs as Inconclusive. Only AFIB is positively identified as well as Bradycardia and Tachycardia. For my use - Inconclusive is basically telling my I have irregular rhythm and its PVCs in my case. Works well, occasionaly with dry skin - it says unreadable - but a slight moving and resetting of the strap brings it back online. It works for 8-10 hour sleep monitoring or just an hour of interval training or yoga. All the things I cannot do with just my Apple watch or Whoop.

I’ve been using the Frontier X2 Smart Heart Rate Monitor chest strap for about six months, and it’s become a key part of my daily routine. I use it across a wide range of activities—Peloton Bike+, running, stretching, meditation, HIIT, yoga, indoor and outdoor cycling, and strength training. I also deal with heart rhythm issues, including arrhythmias, PACs, PVCs, possible AFib, and occasional pauses, so having consistent, reliable monitoring is important to me. What stands out most is its ability to track heart activity during sleep. It captures every beat and provides detailed insights like heart strain, HRV, and sleep stages (awake, REM, light, and deep). The strap is very comfortable, even overnight, and the battery lasts several days with heavy use. The data has been incredibly useful in helping me evaluate whether my lifestyle changes are actually making a difference. One of the biggest takeaways for me has been seeing how well my treatment is working. The device has helped confirm that my medication is effective—and more importantly, that my CPAP therapy has made a huge impact. 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. Since starting CPAP, my arrhythmia burden during sleep has dropped from around 70% to about 7%, and it continues to improve. I also use a Kardia 6L, which is great, but it doesn’t provide the same continuous tracking or depth of data as the Frontier X2. As a web applications developer, I really appreciate the software experience. Both the mobile app and the web dashboard are clean, intuitive, and recently updated. The interface makes it easy to understand the data, and I especially like how it clearly flags arrhythmias so you don’t have to manually scan through ECG recordings. Yes, it’s a bit pricey—but in my opinion, it’s absolutely worth it. I was so impressed that I even bought one for a friend who’s a nurse and nationally certified ECG technician at Kaiser. I also pay for the yearly subscription, and I find it well worth the cost. Overall, I’m genuinely glad a device like this exists. It’s given me real insight into my heart health and helped me track meaningful progress. If you’re considering it, I’d definitely recommend it—you’ll likely love it as much as I do.

This is an important device to monitor my progress. I use it almost every day to track individual workouts. In addition I have worn it overnight to track my heart rate during sleep (once a month). This is a high fidelity measurement device coupled with software to track trends both individual workouts and week/month trends.

Really good product! Up there with the best heart rate monitor on the market! Solid data with ECG recording capabilities! Customer service is top notch. The APP is user friendly! Definitely worth trying out for yourself and highly recommended!

Prompt, courteous service

I have had my device, the Frontier X 2, for almost two years now. Over that time, I had an issue with the device rectified quickly following some email communication with their support team, who helped me reset the device. I have also had a couple of live Zoom/Teams calls with them to discuss the results I was getting with the device, which I was unclear about. They have always been quick to answer my support questions, and they even accommodated times for the live calls outside of their normal hours, which was great. I use the device at least 4 days of the week when training, and I am overall very happy with my purchase.

Product did not work for me. Kept getting noise in my data regardless of what I did spending time with Customer support. However the customer support team was extremely responsive, polite and accommodating. This would have been zero stars without their support and help. Resulted in full refund of my cost. Now receiving calls from customer support to change or remove my review. So dont trust the reviews you do see. There are other products out there try one of them.

Very helpful and responsive.