# Seize Light — The right light, right time > The right light, right time (iPhone/iPad app by sebastian totte.) - Source: https://appshunter.io/ios/app/seize-light/id6784576883 (this page in markdown: same URL + `.md`) - Developer: [sebastian totte](https://appshunter.io/developer/1819107580) - Category: Health & Fitness, Lifestyle - Price: Free - Age rating: 4+ - Requires: iOS 18.0 · 34 MB - Languages: American English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, Canadian French, German (Germany) and 23 more - Released: 2026-07-10 - Data updated: 2026-08-27 - User reviews in markdown: https://appshunter.io/ios/app/seize-light/id6784576883/reviews.md ## What is Seize Light? Get the right light at the right time. Seize Light reads where you are and the sky above you, computes the sun's real position on your device, and shows your daily light windows — when to get outside, and when to wind down. Most sun apps just show today's UV number. Seize Light shows your two windows: a morning-light window to help set your body clock, and the vitamin-D window — the part of the day the sun is high enough to make vitamin D — plus an evening wind-down to help protect your sleep. Your Apple Watch's Time in Daylight turns it into a passive daily habit, with a transparent Light Score and a streak. YOUR THREE WINDOWS • Morning light — get outside soon after waking to help set your clock; today's target minutes adjust for cloud cover. • Vitamin-D window — opens when the sun is high and UV is strong enough, and closes when it isn't (it tells you why). Keep it short and sub-erythemal. • Evening wind-down — when to dim the lights and protect your sleep. THE LIGHT SCORE A simple, transparent 0–100 score from three parts — morning light, daylight total, and evening protection — fed by your Apple Watch's Time in Daylight. Missing data is never held against you. Build a daylight streak and watch your 90-day trend. EVERY NUMBER IS CITED The solar math, the UV model, and the vitamin-D estimate all trace to published science in an in-app "How this works" screen. HONEST BY DESIGN • UV comes from weather-forecast data (Apple Weather), not a sensor. • Vitamin-D output is an estimate from a model, not a blood test. • Sun safety first: protection is advised at UV 3+, and the rule is always — don't burn. • General wellness and educational use only — not medical advice. Consult a healthcare professional before making health decisions. PRIVATE BY DESIGN • No account. No sign-up. • The solar and vitamin-D math run on your device; only coarse coordinates are sent, for the weather lookup. • Health data is read-only and never leaves your device, except to sync through your own private iCloud — and it is never used for advertising. Weather data provided by Apple Weather. Carpe lucem. Seize the light. ## Version history (last 3 releases) ### 1.3.1 — 2026-08-24 Easier to read, easier to hit — and the reminders you may not have noticed. ACCESSIBILITY Every big number now responds to your text size. Set Larger Text and the lux reading, the Light Score, your session dose and the trends figures all scale with it, instead of staying stubbornly small. "Start a sun session" and the Apple Weather link were smaller tap targets than Apple's minimum. Both are now comfortably tappable wherever you press them. The safety text — the "not medical advice" and "don't burn" lines — is darker. It was the least legible copy in the app, which is the wrong way round for the copy that matters most. ANALYTICS, OFF UNLESS YOU SAY SO Settings now has "Share anonymous analytics". It is off, nothing is collected until you turn it on, and it cannot be used to track you across other apps or websites. WHILE YOU'RE HERE — WHAT ARRIVED IN THE LAST UPDATE The release notes for that one described the wrong version, so in case you missed it: Reminders now reach you outside. Seize Light can tell you when your morning light is ready and when to start winding down. The times are computed on your device from the sun where you are, so they move with the season. Nothing is sent to a server and there is no account. You are asked once during setup, with everything else off — say no and the app asks for nothing. Log from your Home Screen. Add the medium widget and it carries a single button: your morning light before the evening wind-down, your evening protection after. One tap, without opening the app — which is the point, because the thing being logged happened outdoors. Your sun sessions are kept. The dose-and-burn session used to throw everything away when you left the screen. It now records your minutes, the estimated vitamin D, the peak UV and where you stopped relative to a burn. Trends gains a card for the week, and a session in your morning window counts as your morning light so you are not asked to report the same thing twice. ### 1.3 — 2026-08-11 A rebuilt home screen, a camera light meter, and a globe. THE HOME SCREEN NOW LEADS WITH WHAT TO DO Open the app and the first thing you see is the decision: morning light is open, the vitamin-D window closes at 15:05, wind down around 20:44 — with the two numbers that qualify it, UV now to today's peak and the oldest UV rule there is (if your shadow is shorter than you are, the sun is high). Under it, all three of your light windows are on the screen at once, each showing where it stands right now and opening in full with a tap. The day's arc sits below them, where context belongs. MEASURE THE LIGHT YOU'RE ACTUALLY IN Your camera now works as a light meter. Point it at a room and read it in lux or foot-candles, with what that number means for this hour: bright enough to set your body clock, or dim enough to protect your sleep. Ordinary room light is around 100–500 lux — even an overcast sky outside is many times brighter. Nothing is recorded: no photo or video is saved, and no image ever leaves your device. A GLOBE, WHEN YOU WANT ONE Tap Globe at the top of the home card to swap the day's arc for the Earth, centered on you — the day/night line sweeping toward you, where the sun stands directly overhead right now, and the tropics and polar circles that decide whether a vitamin-D window is even possible where you live. A RICHER SUN ARC The arc shades real sky brightness through twilight, traces the day's UV alongside the sun's path, and shows the sun's live elevation and compass bearing. Drag along it to read the time at any point in the day. SHARE YOUR LIGHT DAY Trends can now build an image of your day — the arc, day length, your Light Score, your streak and the peak UV — to save or send. It carries nothing from Apple Health, and no location more precise than the name of the place. ALSO IN THIS RELEASE • Trends opens with your last 14 days. Days you didn't track show as a faint mark, never a zero — a day you didn't log is not a day you scored nothing. • Your Light Score card now shows your streak and the shape of your week; logging moved to its own card beneath it. • Settings is ordered by what you actually change: reminders first, your profile behind a single summary line. • A new Bedtime setting shapes your evening wind-down. • Nothing shows a dash where a number should be. On a fresh install the app tells you what to do instead. • Live UV is back and steadier, so the vitamin-D window and your Light Score run on real conditions again. This version also introduces a single, consent-based ad when you return to the app. You choose what you share, and you can change it any time in Settings › Privacy › Privacy choices. Your Health data and your location are never used for advertising. Every number is still an estimate, and still cited. General wellness and educational use only — not medical advice. Don't burn. ### 1.0 — 2026-07-10 No release notes. ## More apps by sebastian totte - [Seize Week](https://appshunter.io/ios/app/seize-week/id6780064014) - [Seize Life](https://appshunter.io/ios/app/seize-life/id6781084740) - [Space Maze Arcade](https://appshunter.io/ios/app/space-maze-arcade/id6785442502) All apps by sebastian totte: https://appshunter.io/developer/1819107580 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*