[This review was collected as part of a promotion.] I am thrilled with my Ultrahuman Air ring. I purchased it and a leading competitor to do a side by side review. After just 2 weeks, I returned the other ring - the Ultrahuman was just so much better. The Ultrahuman app is amazing. Almost immediately I started seeing improvements in my sleep, health and energy level. Both my Ultrahuman app and my Apple Health app showed significant improvement in many areas (HRV, deep sleep, amount of sleep, Vo2, resting heart rate, etc.) in just a few weeks. I did a lot of research before buying. In the past several people have had problems with their ring not recording data. I have not had any problems. But one person said that when you are picking a size it's best to get a ring that is too tight to take off in the morning without using water. I did that and my ring stays in place during the night. If the ring is too loose it will twist around and not be able to record your info. Also, try to pick a size of ring that you can move to other fingers if you lose or gain weight. Finally, the ring is NOT as good in measuring workouts and your steps as the Apple watch. But I have a watch for that. From personal experience the ring is MUCH better at tracking sleep. It often shows more deep sleep than my watch. Also, it tracks the REM and other stages more accurately. Often I wake up suddenly during a dream. The ring shows that I have gone directly from REM to awake. The watch does not show that.

[This review was collected as part of a promotion.] I bought this ring at the start of the year and it has been a gamer changer! So helpful for me to keep track of my zones during workouts, monitor my sleep and adjust my routine to maximise my readiness for the day

[This review was collected as part of a promotion.] I bought this a few months ago to monitor my sleep since I wasn’t sleeping well, and I loved the caffeine window feature because I was drinking too much coffee—sometimes to the point of feeling heart palpitations. In fact, there are many more functions that help me in my daily life, and I have no regrets. I love it! Plus, it looks great when worn. Thank you, Ultrahuman

[This review was collected as part of a promotion.] Absolutely thrilled with this purchase! Comfortable lightweight, and provides all the information I need to keep my marathon training on track. I really love the detailed cardio and sleep pattern information which makes it easy to make sure that I am not over training.

[This review was collected as part of a promotion.] I’ve been using the Ultrahuman Ring for a while now, and I’m really impressed. I did a lot of research comparing this ring to a competitor, and I’m so glad I went with Ultrahuman. The thing that really sets it apart is the actionable guidance, especially the nudges around things like my caffeine window. It’s been surprisingly helpful to make small changes that have a big impact. I initially purchased it to track my sleep, and I’ve found the data to be not just interesting, but genuinely helpful in improving my rest. The insights have given me a better understanding of my sleep patterns and helped me optimize my habits. Overall, it’s been a great addition to my routine, and I’m looking forward to seeing even more benefits as I continue to use it!

I have been through 3 rings (original purchase PLUS 2 warranty replacements) in a year in a half due to connection and/or battery issues. These rings suck. My 2nd replacement ring battery won't hold a charge after 7 months. Customer service said they were sending me another replacement… my last one… but when I reached out for tracking number they told me they were cancelling the request.

[This review was collected as part of a promotion.] Stopped sending data to my app after about 2 months of use and the battery dies after a few hours - doesn't last a full night. I tried resetting it, followed all of the prompts, but nothing will fix it. Basically completely useless and a total waste of money.

[This review was collected as part of a promotion.] I bought this ring in last month and it is so help to track my diet and help properly and daily and I mostly like part in the ring is how much calories burnined during walking and cycling , running .this ring can help you more for help tracking diet and health and reduce the expensive health treatments.

[This review was collected as part of a promotion.] Really happy with the ring, it pushed me to walk and sleep, and it radically improved my life. All the stats have nice widgets, finally I can track my coffee intake (previously it was so chaotic). I feel a loooooot better. Waiting for the weight loss feature. My wife gotta Oura, so we can compare. And I'm super happy I picked Ultrahuman. Everything goes really good so far. I had a minor scratch though, probably from a cat. But other than that, I'd definitely buy another one, when this one is dead.

[This review was collected as part of a promotion.] "I’ve been using the Ultrahuman Ring AIR for about two months now, and I chose it over other smart rings because of its impressive hardware and intuitive software. One major plus is that it works seamlessly with both iPhone and Android, which made it a versatile choice for me."