Ōura

$299 (about £190) ouraring.com

What is it? Ōura’s makers describe it somewhat inelegantly as a “ring-sized wellness computer”, but that’s a pretty accurate description. It takes all kinds of measurements, from your heart rate and temperature to your sleep quality and activity intensity. It then analyses the info, feeds it back to you and suggests ways to improve your lifestyle. When’s it due? November 2015. Why are we excited? It’s subtle and unobtrusive, but beneath its modest exterior lies a plethora of high tech smarts. If it can help you sleep and work better then it could be an ideal companion to Apple Watch’s health and fitness apps. One ring to rule them all!