It promises heart rate tracking accuracy plus or minus 2bpm against medical grade monitoring and a +/- 3% accuracy for SpO2 monitoring it's capable of as well. It can take blood pressure measurements while capturing that ECG measurement and once you've calibrated it with a cuff-style monitor first. It's not just ECG that this clever ring can track either. We've seen ECG sensors on smartwatches and fitness trackers, but now Bodimetrics in partnership with Prevention has put that tech into a smart ring too. Read our full review of the Ultrahuman Ring Air. It costs $349 / £280 / €325 without on-going subscriptions, so is a good alternative to Oura in terms of cost. The Ultrahuman app also has a glucose element, and pais to a CGM for analysis of blood sugar. These are compared to established baseline scores, and there's a traffic light system to show if these are outside of your personal norms. There's also a recovery score, which also tracks metrics such as resting heart rate, heart rate variability, and body temperature. These aren't hugely advanced in terms of tracking, but interesting additions that sit well alongside the deep insights. It also puts a focus on recovery – and helping manage circadian rhythms, including managing stimulants and prompting healthy wind-down times. We found that sleep tracking was largely reliable, with accuracy that took up well to Oura and Whoop. Sleep is the main focus, and there's a sleep index that takes into account a wide range of data and metrics. If you're used to wearing big rings – and they suit your hands – then this can be a very good option. It's still an extremely chunky ring, and we've not found it hugely comfortable or attractive to wear. It's lighter and smaller than its predecessor, at just 2.4g, making it more comfortable to wear. ![]() The Ultrahuman Ring Air is the company's second-generation smart ring.
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