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Wavelength

Circadian Light Meter

Measure the light that actually affects your sleep. Point your iPhone camera at any light source and get science-backed guidance for your circadian rhythm.

Bright morning reading: 350 melanopic lux, shifting sleep earlier Daytime reading: 180 melanopic lux, strengthening circadian rhythm Dim evening reading: 3 melanopic lux, keep it dim

Melanopic Lux

Not all light is equal. Wavelength measures the specific wavelengths that drive your circadian system, not just brightness.

Smart Guidance

Recommendations adapt to your sleep schedule, the time of day, and your circadian phase. Based on peer-reviewed phase response curves.

No Hardware

Uses your iPhone camera. No accessories, no special equipment. Point at any light source and get an immediate reading.

Daily Reminders

Set your current and target bedtime. Wavelength schedules notifications for when to dim lights, seek light, and avoid light.

Jet Lag and Shift Work

Traveling or working irregular hours? Wavelength helps you shift your sleep schedule in the right direction with timed light exposure.

Built on Science

Implements Brown et al. (2022) expert consensus from PLOS Biology and Hannay et al. (2019) phase response models.