Wavelength: Jet Lag & Light

Name: Wavelength: Jet Lag & Light
Rating: 3 (1 reviews)
Author: Impulse Arc LLC

Circadian rhythm sleep coach

Only for iPhone

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

1 Rating
Age Rating

9+
Years
Category

Health & Fitness
Developer

Impulse Arc LLC
Language

EN
+ 13 More
Size

3.8
MB

iPhone

Point your iPhone camera at the room: Wavelength tells you if this light is helping or hurting your sleep, then plans your light for sleep, shift work, and jet lag. Wavelength measures the light around you and tells you whether it is helping or hurting your sleep. Point the camera at the room. Wavelength reads the melanopic light – the part of light that sets your body clock – and gives you a verdict: this light is shifting your sleep earlier, or later, or not at all, and how long that lasts. FREE UNTIL SEPTEMBER 2027 Everything in Wavelength is free for everyone until 19 September 2027: the live light meter, the verdict on the light you are in, and your light plan. YOUR LIGHT PLAN Set the wake-up time you want. Wavelength plans your day: when to get bright light, when to avoid it, and when to sleep, so your body clock moves to the new time and stays there. The same plan handles shift work and jet lag. THE ONLY APP THAT DOES BOTH Light-meter apps give you a number. Sleep-coaching apps give you a plan. Wavelength measures the light you are actually in and coaches your real schedule. No wearable. FALL ASLEEP ON TIME See the moment evening light starts keeping you up, and get a reminder to dim the lights. JET LAG Set where you are going. Wavelength tells you when to get daylight and when to avoid it, before and after the flight, so you adjust faster. SHIFT WORK Move your sleep to fit your shifts, and see whether the light you are in is working with you or against you. REMINDERS A notification when each light window opens, so you can plan a walk or a wind-down around it. BASED ON PUBLISHED RESEARCH Wavelength follows the expert-consensus light recommendations of Brown et al. (2022, PLOS Biology) and the light response curves of St Hilaire et al. (2012) and Hannay et al. (2019). Research links well-timed light to better sleep, mood, and focus. Wavelength supports sleep and circadian alignment; it does not diagnose or treat any medical condition. WHAT YOU NEED An iPhone with a camera. Camera readings are approximate, not lab-grade, and that is enough to answer the question that matters: is this light helping or hurting my sleep right now? Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Ratings & Reviews

3.0

out of 5

1 Ratings

Vibe coded and vague
Oct 2
thezohar
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!

Developer Response
Really sorry the app disappointed! “Torch” is UK English that wasn’t supposed to be in the US localization, and in any case you’re right that the wording of this feature is poor. To clarify, it only activates if you leave Wavelength front and aim the phone toward your pillow and leave it plugged in. There’s a research paper to back that up, which I’ve linked to from the product web page. I’ve submitted an update to Apple that should fix this wording. I have put a lot of time into making the app help people (like me) with jet lag and hope you’ll find it works better for you! All the best, Ben
Vibe coded and vague
Oct 2
thezohar

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!
Developer Response 2d ago
Really sorry the app disappointed! “Torch” is UK English that wasn’t supposed to be in the US localization, and in any case you’re right that the wording of this feature is poor. To clarify, it only activates if you leave Wavelength front and aim the phone toward your pillow and leave it plugged in. There’s a research paper to back that up, which I’ve linked to from the product web page. I’ve submitted an update to Apple that should fix this wording. I have put a lot of time into making the app help people (like me) with jet lag and hope you’ll find it works better for you! All the best, Ben

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.

Version 1.9 Sep 23

Data Not Linked to You

The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data

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

Accessibility

Information

Seller: Impulse Arc LLC
Size: 3.8 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 13 more

English, Czech, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish
Age Rating: 9+

9+

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Contains
Health or Wellness Topics
In-App Purchases: Yes

Wavelength $29.99

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