The UV-tracking Gem made me rethink how sunlight affects my health, not just my appearance

Wearable UV sensors now offer personalized insights into sunlight's health impacts beyond sunburn and aging.

The90, a company focused on UV tracking, has released a wearable device called Gem, priced at $249, which measures UVA and UVB radiation separately. The device, worn as a necklace, pairs with a mobile app that provides estimates of vitamin D production, potential health benefits, and risks of aging and sunburn based on user profiles and real-time UV readings. Initially developed with vanity in mind, the author found the Gem prompted a re-evaluation of their sun exposure habits after an incident of heat exhaustion, leading to an understanding of how UV radiation can penetrate shade and how personal factors like medication and melanin content affect sun sensitivity and vitamin D synthesis. The app requires continuous background operation to track UV exposure, and the author noted fluctuations in countdown timers for vitamin D and sunburn. The90 plans to release accessory clips and tags in early 2025.

The emergence of devices like The90 Gem signifies a growing market trend towards personalized health monitoring that extends beyond traditional metrics. By providing granular data on UVA and UVB exposure, coupled with AI-driven estimations of physiological responses like vitamin D production and aging risk, these wearables are shifting the focus from reactive sun protection to proactive health management. This move towards quantifying nuanced biological interactions with environmental factors like sunlight suggests a future where personal devices offer deeper, actionable insights into well-being.

This development impacts consumers by offering a more sophisticated understanding of their relationship with sunlight, moving beyond simple sun protection to encompass potential health benefits and risks previously not easily quantifiable. For individuals with specific health conditions or those living in environments with high UV indices, such as Los Angeles, these devices can provide critical data for lifestyle adjustments. The challenge for the market will be to improve the accuracy and background operation of these sensors, making them more user-friendly and scientifically validated to justify their premium price point for broader adoption.