Wavelength: Sleep & Jet Lag

Light meter & circadian coach

Only for iPhone

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

iPhone

Wavelength uses your iPhone camera to read the light that sets your body clock - and then gives you a daily plan to help you with jet lag, shift work, and well being. Wavelength measures the light that sets your body clock. Point the camera at the room and Wavelength reads the melanopic light — the wavelengths that control your body clock — and then turns your readings into a personalized plan for sleep, daytime energy, and jet lag. The live light meter, your current light guidance, and daily wind-down and light reminders are all free. A 7-day free trial unlocks the full coaching: shifting your sleep to a new schedule, the day-by-day light plan, and jet-lag plans for every trip. ONLY WAVELENGTH DOES BOTH Wavelength measures your real light AND coaches your real schedule — no wearable, just the camera in your pocket. WAKE UP CLEAR Sleep better by getting the right light at the right time. FALL ASLEEP ON TIME Stabilize a drifting sleep schedule, and know the moment your evening light is keeping you up. THE SHIFT WORK COMPANION Shift your sleep rhythm on your terms and stay alert through the night. BEAT JET LAG Wavelength tells you when to chase daylight and when to hide from it, so you land closer to local time. SIMPLE NOTIFICATIONS A reminder as each circadian window opens, so you can schedule walks, workouts, and wind-downs and get the light working for you. PUBLISHED SCIENCE Wavelength follows expert-consensus circadian recommendations from Brown et al. (2022, PLOS Biology), Hannay et al. (2019, Journal of Biological Rhythms), and others. Your body clock runs more than sleep — research links well-timed light to steadier mood, sharper focus, and more energy. Wavelength supports sleep and circadian alignment; it does not diagnose or treat any medical condition. WHAT YOU NEED An iPhone with a camera. That's it. Camera readings are approximate, not lab-grade — exactly right for the question that matters: is this light helping or hurting my sleep right now?

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More of Wavelength is now free: the live light meter, your current light guidance, and daily wind-down and light reminders, no subscription needed. The subscription now focuses on shifting your sleep: the full day plan, travel mode, and reminders timed to your shift. Plus clearer guidance wording and layout fixes.

Version 1.1

The developer, Impulse Arc LLC, 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 Not Collected

    The developer does not collect any data from this app.

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    Information

    Seller
    • Impulse Arc LLC
    Size
    • 3.7 MB
    Category
    • Health & Fitness
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 9 more
    • English, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
    Age Rating
    9+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Impulse Arc LLC
  • Privacy Policy

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