Why sleep is the hardest Tour De France stage to win
How Team Cofidis uses Ultrahuman Ring AIR to maximize recovery during the Tour de France
Jul 08, 2025
James Stables
James Stables is a wearable tech expert and Content Lead at Ultrahuman. He was the founder of Wareable and spent 15 years as a journalist and publisher in the technology and health space.
Heart rate variability (HRV): What’s normal – and how to increase it
We explain HRV, and the science behind this important wearables metric – and finally, what it says about…
Jun 18, 2025
Ultrahuman Early Summer Release Sprint ‘25
Updated: All the features from our week of cross team collaboration revealed
Jun 13, 2025
Introducing Caffeine Window upgrade: Now with real-time tracking and logging
Caffeine Window got personal with effortless tagging, real-time body caffeine levels and adaptable cut-off times.
Jun 13, 2025
UltraSync with Tesla PowerPlug: Sync your mind, body and car
How the UltraSync with Tesla combines sleep, stress and drive data to boost safety at the wheel
Jun 12, 2025
Sleep Algorithm 2.0 explained: Personalized sleep scoring
How Ultrahuman Ring AIR's new machine learning-trained sleep algorithm makes tracking more accurate and personalized
Jun 11, 2025
Introducing Ultra Age: A new marker for biological aging
How Ultra Age uses Pulse, Brain and Blood Age markers to reveal how your body is aging
Jun 10, 2025
Introducing Brain Waste Clearance: A new marker for brain recovery
How the Ultrahuman Ring AIR estimates glymphatic clearance as a window into cognitive health
Jun 09, 2025
Introducing New Parent PowerPlug
How our latest PowerPlug helps new parents get smarter insights into sleep and recovery
Jun 08, 2025