Oura also announced that they are shifting to a subscription service. Six months free with the purchase of a new device, then a monthly fee. For me this is a non-starter. $300 USD is already steep just to track sleep and then add on a subscription, especially given that I already pay for TR, Z (my choice, I know), and a pool membership. Same gripe with Whoop, and it’s less accurate (according to DCRainMaker).
I use Sleep Cycle on my phone and manually add the sleep duration and quality to Metrics in TrainingPeaks. It’s basic, and I’d very much like to get HRV while I sleep (versus using another app after I wake up) but it’s good enough for tracking trends.