Wavelength: Jet Lag & Light

Wavelength: Jet Lag & Light

Circadian rhythm sleep coach

1 ratings
1 review
Free
In-App Purchases

Details

Released
July 8, 2026
Updated
September 23, 2026

Features

Wavelength: Jet Lag & Light video #1 for iPhone
Wavelength: Jet Lag & Light screenshot #2 for iPhone
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Wavelength: Jet Lag & Light screenshot #6 for iPhone
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About

This app analyzes ambient light to optimize your sleep schedule. It provides personalized plans for jet lag, shift work, and general sleep improvement by guiding your light exposure.

✓Melanopic light measurement
✓Personalized light plans
✓Jet lag adjustment guidance
✓Shift work sleep optimization
✓Evening light alerts
✓Research-based recommendations
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What's New in Wavelength

1.9

September 23, 2026

Every screen is now translated in all fourteen languages, with Dutch, Swedish, Polish and Czech new. Everything stays free for everyone until 19 September 2027.

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Subscriptions & In-App Purchases

Wavelength

Coaching for everyday sleep and jet lag.

$14.991 Year
7 Days trial
How to cancel Wavelength subscription ⁉️

User reviews

Vibe coded and vague

The sensor reading is great, but this will spit out phrases at you like “phone down, torch aimed at your face” as if that makes sense.
After puzzling over it I THINK it means it’s going to flash my phone flashlight as a pre-wake function but there’s no explanation of whether that’s a feature, or if I can turn that off (I have a partner on a different sleep schedule than myself AND want to not have a battery drain all night)
I have to hope the AI that helped implement this app correctly applied the relevant sleep models. I guess I’ll find out if this app ends up helping me enough!
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Developer apps

FAQ

What is Wavelength?

Wavelength is a circadian rhythm sleep coach that measures ambient light to help you optimize your sleep schedule. It provides personalized plans for jet lag, shift work, and general sleep improvement by guiding your light exposure.

How does Wavelength work?

Wavelength uses your iPhone's camera to read the melanopic light in your environment, which influences your body clock. It then provides a verdict on whether the light is helping or hurting your sleep and offers a personalized plan.

Is Wavelength free?

Wavelength is free for everyone until September 19, 2027. After this date, subscription plans will be available, with an initial free trial period.

What devices does Wavelength support?

Wavelength is currently supported on iPhones and requires a camera for light readings. It does not require any additional wearable devices.

How often is Wavelength updated?

The latest version of Wavelength is 1.9, and it was last updated on September 23, 2026. Update frequency is typically managed by the developer to introduce new features and improvements.

Can Wavelength help with jet lag?

Yes, Wavelength can help with jet lag by providing guidance on when to seek daylight and when to avoid it, both before and after your flight, to help you adjust faster.

Does Wavelength have ads?

No, Wavelength does not contain advertisements. The app is designed to be ad-free to provide an uninterrupted user experience.

What research is Wavelength based on?

Wavelength is based on published research, including expert-consensus light recommendations from Brown et al. (2022, PLOS Biology) and light response curves from St Hilaire et al. (2012) and Hannay et al. (2019).