Seize Light

Seize Light reads the sun above you and turns it into the two moments that matter each day — when to get morning light to set your body clock, and when the sun is high enough to make vitamin D. Most sun apps show today's UV as a single number. Seize Light shows your day: your place and the live sky draw the sun's real arc, mark your two light windows, and score how much daylight you actually got — using the Time in Daylight your Apple Watch already records. YOUR TWO WINDOWS • Morning light — when to get outside after waking, and how long today (adjusted for cloud), to set your clock. • The vitamin-D window — when the sun climbs high enough to make vitamin D, with a live dose-vs-burn session personalized to your skin type. It aims to stop you well short of a burn — always follow local sun-safety guidance. • Evening wind-down — when to dim the lights as part of a wind-down routine. SCORE YOUR LIGHT DAY Your Apple Watch's Time in Daylight feeds a daily Light Score and a streak. Watch it move through the day and across the week — the passive habit other sun apps never had. EVERY NUMBER CITED The sun's position, the UV index, and the vitamin-D math run right on your device, each value shown with the science behind it. Motivational, not medical. PRIVATE BY DESIGN • No account. • The vitamin-D and sun math runs on your device. • Only a coarse location is sent — for the weather (Apple Weather). • Your Health data never leaves your device and your own private iCloud — never shared with advertisers. Seize Light is the newest app in the Carpe Vitam Tuam family — seize your life. Seize Light is a wellness and educational tool, not medical advice or a medical device. UV and vitamin-D values are estimates; follow local sun-safety guidance, don't burn, and consult a healthcare professional before making health decisions. Requires an iPhone running iOS 18 or later; the vitamin-D and UV features use your location and Apple Weather.