Wavelength

The right light, all day.

Wavelength checks the light around you and tells you when to get more and when to dim it – for better sleep, no jet lag, and steady energy.

iOS only. Free during the beta. We will send a TestFlight invite.

The Wavelength app checking the light around you and saying in plain words that it is good for your body clock

How it works

  1. A bright room full of plants

    Point your phone at the room.

    It reads your light in a second.

  2. The Wavelength app reading that same room and warning the light is shifting your sleep the wrong way

    See if it helps or hurts.

    Plain words, not numbers.

  3. The Wavelength app day planner showing when to get bright light, when to avoid it, and when to sleep

    Plan your whole day.

    When to get light, when to dim it, hour by hour.

The Wavelength app guiding light to shift your body clock toward the new time zone

Jet lag

Land ready, not wrecked.

Crossing time zones throws off your body clock. Wavelength tells you when to get daylight and when to avoid it, so you catch up to local time in a couple of days instead of losing the whole trip.

The Wavelength app confirming the room is dark enough to fall asleep

Sleep

Fall asleep on time.

Bright light at night is the main reason you lie awake. Wavelength warns you when your evening light is keeping you up, and tells you the moment your room is dark enough to sleep.

The Wavelength app showing that your daytime light is bright enough to keep you alert

Energy

Beat the afternoon slump.

Most indoor light is too dim to keep you alert. Wavelength shows you when you need brighter light, so you stay sharp, focused, and awake through the day.

The Wavelength app timing light for a night shift to protect daytime sleep

Shift work

Hold your rhythm on nights.

Working nights pits you against your own clock. Wavelength times your light to protect your daytime sleep and keep you alert through the shift.

Based on the science of light and sleep. Works on your iPhone. No account, no ads.

Guides for your situation

ADHD Most people with ADHD run on a delayed body clock. What timed light can and cannot fix. Seasonal depression Winter shifts the clock and lowers mood. The dose and timing that make light therapy work. Weight & metabolism The same meal spikes blood sugar more at night. How light timing ties to weight and diabetes. Athletic performance You are stronger in the late afternoon, and jet lag costs games. How athletes time light.
Shift work Night work pits you against your own clock. The metabolic and cancer risks, and how to put light on your side. Insomnia & DSPD When you cannot fall asleep, the clock may be late, not broken. The evening light limits that matter. Aging & dementia Older eyes let in less clock-setting light. How daytime light helps sleep, mood, and sundowning. Focus & productivity Bright daytime light measurably sharpens attention. Most desks are too dim to deliver it.
Jet lag Your clock shifts about one zone per day. How timed light, eastward vs westward, speeds it up. Depression & mood Dim days and bright nights track with depression. What large cohorts and light trials show. Teenagers Puberty pushes the clock hours later. Why early school clashes with biology, and what light helps. Immune & long-term health Your immune system runs on a clock. How a strong day-night light signal supports it.
Wavelength app icon

Start getting the right light today.

Wavelength is free while in beta. Join the list and we will send your invite.

iOS only. Free during the beta. We will send a TestFlight invite.