Seize Light

The right light, right time

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Morning light now opens at sunrise, not your alarm. Time your minutes outside, let the camera read how bright it really is, and turn to face the sun through cloud. 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 that tells you when to dim the lights. 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 as part of a wind-down routine. 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.

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Morning light now follows the sun, not your alarm clock. YOUR MORNING WINDOW OPENS AT SUNRISE It used to open when you said you woke up, which made it a statement about a setting rather than about the sky: set 07:00 in a dark December and the app would tell you to go out well before the sun came up. The window now opens at sunrise and closes midway to solar noon, so it moves with the season and with wherever you are standing. There is nothing to configure, and the wake-time question is gone from setup. If you had set a wake time, it is still doing one job: your morning reminder will not arrive before it. That is there so a midsummer sunrise does not wake you at half past three. A TIMER FOR YOUR MINUTES OUTSIDE Step outside, press Start, and the app tells you when you have had enough. It runs on the clock rather than on the screen, so you can lock the phone, put it in your pocket and keep walking, and the time still counts. When the dose is full you get a notification and the day is logged for you. How long is enough depends on how bright it is, so the app would rather measure than guess. Turn on Measure the light and the camera reads the brightness you are actually standing in: full sun fills the dose in about five minutes, heavy cloud takes nearer half an hour. Switch it off and the timer carries on at whatever it last measured, or at the forecast for your sky. Indoor light earns nothing, which is the whole point of going outside. FIND THE SUN A compass that points at the sun, for the mornings you cannot see it. Cloud, a building or a hill hides the sun without switching it off, and outdoor light on a grey morning is still many times brighter than any room. Hold the phone flat and turn until the sun meets the mark at the top, and you are facing it. Before dawn it points at where the sun will come up and tells you when. Face towards the sun, and never stare straight at it. TODAY, WINDOWS AND TRENDS, ONE TAP APART A tab bar along the bottom. Your three windows and your trends used to sit behind buttons on Today, and now each has a tab of its own. A running morning timer carries on while you move between them. ALSO • Remove Ads is now one tap away, at the top of Today. • The sunrise and sunset times under the sun's arc are readable again: the curve no longer runs through them, and they no longer spill off the edge of the screen. ALSO FIXED, IF YOU BOUGHT REMOVE ADS Three problems could hide your unlock on a slow connection: the tracking prompt could appear to someone who had paid to remove it, leaving Settings while the app was still checking could drop the unlock until the next launch, and the price could sit on Unavailable and never resolve. All three are fixed. Everything here stays an estimate with a source you can read in the app. The durations follow published morning-light guidance, the brightness figure is worked out from your camera's exposure rather than read off a light sensor, and none of it is medical advice.

The developer, sebastian totte, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers
    • Usage Data
  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Identifiers
    • Usage Data
  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Health & Fitness
    • Location
    • Identifiers

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

Seller
  • sebastian totte
Size
  • 36.3 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 18.0 or later.
  • iPhone
    Requires iOS 18.0 or later.
  • Mac
    Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 2.0 or later.
Languages
English and 32 more
  • English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
Age Rating
9+
  • 9+
  • Contains
    Advertising
    Health or Wellness Topics
In-App Purchases
Yes
Copyright
  • © 2026 Totté Studios