Fourth Frontier (fourthfrontier.com) has a 4.4 out of 5 rating on OK.one, based on 60 user reviews collected here. It is listed under Construction & Manufacturing and its reputation is good. 81% of reviews are 4 stars or higher and 7% are 1 star; The business has replied to 100% of negative reviews. Last updated 2026-08-10.
Amazing product which i always wanted to buy. And got the delivery within 4 days after placing the order.
However the device wasn't recodring any activity to which I mailed the support system and they resilved the issues withing few hours.
Great experience and happy me 😊
Reply from Fourth Frontier2026-02-09
Thank you so much for sharing your experience with us. We’re really glad to hear that the delivery was quick and that our support team was able to resolve the recording issue within a few hours. It’s great to know the device is now working as expected and that you’re happy with your experience. If you ever need any assistance or have questions in the future, we’re always here to help. Wishing you a great experience ahead with the device!
T
Tom Mardling · 21 reviews · Experienced 2026-02-01 ·
★★★★★
Great customer service
Great customer service, had a synching issue but customer service replied within a few hours and had it sorted the next day. Finding the extra layer of ECG data over regular HRM really useful.
Reply from Fourth Frontier2026-02-03
Thanks so much for taking the time to share your experience! We’re really glad our support team could get the syncing issue sorted quickly for you. If you ever need anything else, we’re always happy to help!
M
Mary Tibbotts · 2 reviews · Experienced 2026-02-02 ·
★★★★★
Promising idea, but unreliable — not what you want for a medical-grade device
I bought the Fourth Frontier X2 on the recommendation of my cardiologist. I’m a runner with a history of ventricular tachycardia, so the ability to take live ECGs during runs and send them to my doctor sounded incredibly valuable.
Unfortunately, the reliability has been extremely disappointing — especially given the price and the fact this is marketed as serious health tech.
In under a year, the problems started. The magnetic charging point became rusty from sweat (something you would expect to be tested against in a wearable designed for exercise). Customer service told me to use a USB charger instead.
Next came connectivity issues — the app couldn’t receive data from the device. I was offered a refurbished replacement, which worked for a while, but then more faults developed:
Finishing an activity and trying to stop recording would freeze the app, which continued recording indefinitely. The only way to stop it was to uninstall the app completely.
Activities would randomly stop recording mid-run.
Sometimes the device wouldn’t turn on at all.
It has been one issue after another. This is an expensive piece of kit that’s meant to provide dependable health monitoring, yet I’ve found it stressful and unreliable — the opposite of what you need when using a device for heart monitoring.
I really wanted this to work, but based on my experience, I would not recommend it.
Reply from Fourth Frontier2026-02-03
Thank you for sharing your experience. We’re sorry to hear about the issues you’ve encountered and understand how frustrating this must have been. One of our support executives will reach out to you shortly to offer further assistance and review your concerns. We appreciate your feedback and the opportunity to help.
P
Peter · 52 reviews · Experienced 2026-01-22 ·
★★★★★
One of the most customer orientated…
One of the most customer orientated company's I have ever dealt with. Nothing is too much trouble, if you have queries members of staff take them on board and make it their responsibility to get you the correct information. Five stars are not sufficient to grade Fourth Frontier. Their products are first class and their follow up programme ensures that you can get the absolute maximum out of your product. Special mention to Poonam for her ongoing support and Pradnya for giving me so much information on my monitor. Thank you again.
Reply from Fourth Frontier2026-01-23
Thank you so much for your wonderful feedback. We’re really pleased to hear that you’ve had such a positive experience with both our team and our products. Your kind words about the support and follow-up mean a great deal to us, and we’ll be sure to pass on your appreciation to Poonam and Pradnya. Thank you for your trust and support — it truly motivates our entire team.
M
Martin Andrew · 6 reviews · Experienced 2026-01-16 ·
★★★★★
Customer support
I recently had a problem with my X2 unit not charging. Customer support was excellent, really helpful solving the problem.
Reply from Fourth Frontier2026-01-16
Thank you for sharing your experience. We’re glad to hear that our support team was able to help resolve the charging issue with your X2 unit. Providing timely and effective support is very important to us, and your feedback truly means a lot. Please don’t hesitate to reach out if you need any further assistance—we’re always here to help.
J
Jeff Kirschenmann · 1 review · Experienced 2026-01-12 ·
★★★★★
It is obvious that this team strives to…
It is obvious that this team strives to offer a world class product and support experience. My son was infrequently experiencing some irregular heart rhythm. After researching several sources we found this product as an option he could use for long term monitoring and potentially capable of offering him and his medical support team the information needed for diagnosis. After consulting his medical team, we opted to go for an even higher grade medical device. Going through the purchase and return process was pure professionalism.
Reply from Fourth Frontier2026-01-16
Thank you for sharing such a thoughtful review. We truly appreciate you taking the time to describe your experience with us.
We’re glad to hear that our product and support could play a role during your research and decision-making process, and we completely understand your choice to proceed with a higher-grade medical device after consulting with your son’s medical team. We’re especially pleased that your experience with our purchase and return process felt professional and seamless.
Wishing your son all the very best, and please don’t hesitate to reach out if we can be of any assistance in the future.
J
Johannes · 16 reviews · Experienced 2026-01-12 ·
★★★★★
amazing support
I have to say, Fourth Frontier is a whole new experience for me: I've never had such an excellent support from any company in my life. It's a young company, which really tries to make every customer happy, and for that they go even further than just the extra mile. Friendly, quick, flexible, personal. It's really amazing. I would wish every company would treat their customers like that. I was really skeptical, but through their great support, they turned me into a loyal customer.
Reply from Fourth Frontier2026-01-13
Thank you so much for taking the time to share such thoughtful feedback. We’re truly grateful for your kind words and are delighted to hear that your experience with Fourth Frontier has been so positive.
As a growing team, we put a lot of care into supporting our customers personally and making sure every concern is addressed with attention and flexibility. Knowing that our efforts helped turn your initial skepticism into trust and loyalty means a great deal to us.
We sincerely appreciate your support and look forward to continuing to be there for you whenever you need us.
T
Tom Mills · 1 review · Experienced 2026-01-03 ·
★★★★★
Did Replace Device Finally
After many emails, they replaced my device, but they did not provide a solution for the same issue recurring on the new device!
Had my device for less than a year and it quit charging. Support did take it back to look at it and installed a USB c to magnet adapter. Now after 6 months the adapter has rusted due to perspiration and now has damaged the device internally. They offered to let me buy a new unit for a discounted price after their fix made my device useless! I would strongly suggest other options! I am using a WHOOP LIFETIME currently!
Reply from Fourth Frontier2026-01-05
Thank you for sharing your experience. We’re sorry to hear about the inconvenience this has caused and understand how frustrating this must be. Our support team is here to assist you and will be reaching out to you directly to review your case in detail.
For clarity, we do not carry out internal repairs. Under warranty, we always replace the device, and in your case, you may have received a replacement device earlier. We’d still like to review the details with you and see how best we can assist further.
We appreciate you bringing this to our attention and look forward to connecting with you.
Everything was amazing! Highly recommend this device and customer service was second to none.
Everything was amazing
Reply from Fourth Frontier2025-12-31
Thank you so much for your wonderful feedback! We’re thrilled to hear that you had a great experience with both the device and our customer support. Your recommendation truly means a lot to us. If you ever need anything in the future, we’re always here to help.
D
Doug · 1 review · Experienced 2025-12-25 ·
★★★★★
Fantastic product and fantastic company that stands behind their product!
This is an outstanding company that stands behind their product. I had my Fourth Frontier X2 for about a year when I started having some problems with saving data. I contacted the customer service department and they attempted to work through different fixes to no avail. Poonam realized the trouble I was having and setup a return and at the same time sent me a new unit. I received the new X2 yesterday and used it today… perfection! What a great experience I had with this company and their great product. The X2 is an outstanding unit that works incredibly well and their customer service is second to none!
Reply from Fourth Frontier2025-12-26
Thank you for taking the time to share such a wonderful review. We’re truly glad to hear that our team was able to support you and ensure everything was resolved smoothly.
It’s great to know that your new Frontier X2 is working perfectly and delivering the experience you expect. Your kind words about our product and customer support mean a great deal to us, and we’ll be sure to share your feedback with the team.
Thank you for your trust in Fourth Frontier and for being part of our community.
I just love this product and company. I recently had some heart issues and would use this product to monitor my progress. I had some issues with the device but were quickly resolved by the Fourth Frontier team especially Sahid. I would definitely recommend this to everyone.
Reply from Fourth Frontier2025-12-29
Thank you so much for your kind words and for taking the time to share your experience. We’re really glad to hear that the device has been helpful for you and that our team was able to resolve the issues quickly. It’s especially great to know that Sahid could support you during this time.
We truly appreciate your recommendation and wish you continued progress and good health. If you ever need any assistance, we’re always here to help.
R
Robert Cockrell · 1 review · Experienced 2025-12-22 ·
★★★★★
Banti Kumar did a great job!
Banti Kumar did a great job of solving my problem quickly. I love my new monitor. Knowing your heart rate isn't enough. Being able to see the P-QRS complex gives real insight.
Reply from Fourth Frontier2025-12-26
Thank you for sharing your experience with us. We’re glad to hear that your issue was resolved quickly and that you’re enjoying the monitor. We truly appreciate your feedback and your support of Fourth Frontier.
I contacted the Fourth Frontier support people as I had a problem with my new device. I was very impressed by the way they answered quickly and resolved my issue.
I am using the device to monitor my heart rate as I quickly become ill when exercising outside my recommended zone. I love the way it alerts me if I am starting to overdo my exercise. This will give me much more confidence when exercising and playing with the grandchildren.
Reply from Fourth Frontier2025-12-26
Thank you for sharing your experience with us. We’re glad to hear that our support team was able to respond quickly and resolve the issue for you.
It’s wonderful to know that the alerts are helping you exercise with greater confidence and stay within your recommended zone. We’re especially happy to hear that this gives you peace of mind while staying active and enjoying time with your grandchildren. Thank you for choosing Fourth Frontier and for your kind feedback.
D
David Griffiths · 4 reviews · Experienced 2025-12-17 ·
★★★★★
Excellent
After 6 or 7 years my heart monitor has bitten the dust, probably because of my own fiddling. Over this time the unit and the app has been very good, I have enjoyed using this device and while initially pricey its been well worth the money. When I've needed help the customer service has been instant and useful, just what customer service should be. Excellent!
Reply from Fourth Frontier2025-12-18
Thank you for sharing your experience with us. We’re really glad to hear that the device and app have served you well over the years and that you found the investment worthwhile. It’s also great to know our support team was able to assist you promptly whenever needed—that’s exactly the experience we aim to provide.
We truly appreciate your kind words and long-term trust in our product. If there’s ever anything we can help with in the future, please don’t hesitate to reach out.
e
elon.work · 6 reviews · Experienced 2025-12-14 ·
★★★★★
In a cheap price giving a good product
Reply from Fourth Frontier2025-12-18
Thank you for your feedback. We’re glad to hear that you found the product to be good value for money. We appreciate your support and are always here if you need any assistance.
Fitness tracking with great leading metrics to track overall physical health . The premium features really help in tweaking ones fitness plans and . Very useful particularly for an aging body . HRV and VO2 max help in maximizing fitness and stress levels
Reply from Fourth Frontier2025-12-12
Thank you for sharing this wonderful feedback! We’re really glad to hear that the Frontier X2’s advanced metrics—especially HRV and VO2 Max—are helping you track your overall health and fine-tune your fitness plan. It’s great to know that the premium features are adding real value, particularly as you focus on staying fit over time. We truly appreciate your support, and we’re always here if you ever need any assistance!
C
Consumer · 1 review · Experienced 2025-12-03 ·
★★★★★
This device is really GREAT
This device is really GREAT. It always works... connects easy to both my Zwift and Rouvy and reliably gives a real life EKG that is clear, easy to read and is emailable to a physician etc. It breaks down your history very clearly and easily to understand on the app. Everything form training load to heart rate to breathing rate and heart strain to an accurate VO2 max ... worth the money. Highly recommend !!
Reply from Fourth Frontier2025-12-08
Thank you so much for sharing this wonderful feedback! We’re really glad to know that your device has been working seamlessly with Zwift and Rouvy, and that the ECG clarity and app insights have been helpful for you. It’s great to hear that the training metrics and history breakdown are adding value to your sessions as well.
We truly appreciate your recommendation and support. If you ever need any assistance, we’re always here to help!
Thank you so much for your kind words and recommendation! We’re really glad to hear that you had a positive experience. If you ever need any assistance or have feedback to share, we’re always here to help.
S
Simon Colvey · 1 review · Experienced 2025-09-08 ·
★★★★★
Stand by the product
I purchased the Frontier X 2 on 14 Feb 2024. It stopped working on September 8, 2025. I contacted support. Unit was assessed directly by a rep (via online meeting) and determined to be defective. No refund or exchange was issued because unit had not been purchased though a channel Frontier recognise. Even though the unit was authentic, they did not stand by the product nor recalled to inspect closer to determine what had gone wrong. Cost of unit was 450AUD and didn’t even last 2 years. Not great value. Frontier offered a 30% discount on a new unit that on the website is nearly 600 USD (and offered with a standard 25% off). Why would I buy again, even with a very poor discount, based on durability experienced?
If the unit is authentic then stand by it.
Reply from Fourth Frontier2025-10-27
We apologize for the issues with your Frontier X2 device. However, it is difficult for us to offer any warranties for devices purchased outside our authorized distribution channels, as we cannot verify whether the device is new, fully functional, or has been tampered with. We do stand by our products and are committed to supporting our customers. As a gesture of goodwill, we’re happy to offer a discount—over and above the standard discount—towards the purchase of a new device directly from us. Please contact us if you wish to proceed with the purchase.
I had a charging issue with my X Plus and contacted technical support.
Poonam responsed very quickly and sent an instruction movie how to solve the issue.
After all it was just the led's showed another pattern than expected due to an update to the latest firmware, so not really a technical issue :)
Thanks for the support Poonam!
Reply from Fourth Frontier2025-10-27
Thank you for sharing your experience! We’re glad to hear that Poonam was able to assist you quickly and that everything is working well with your X Plus. We appreciate your understanding and kind words — it means a lot to our team!
