Having also done some googling on whoop and HRV, came across Biostrap as an alternative: https://www.biostrap.eu/shop_uk
As a sleep and recovery tracker it seems to get pretty good write ups. No silly subscription model and a few reviews suggest it's more accurate.
@Glanton started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Having also done some googling on whoop and HRV, came across Biostrap as an alternative: https://www.biostrap.eu/shop_uk
As a sleep and recovery tracker it seems to get pretty good write ups. No silly subscription model and a few reviews suggest it's more accurate.