Privacy Policy

Wavelength for iOS. Effective July 8, 2026.

Overview

Wavelength is built by Impulse Arc LLC. The app does not collect, store, or transmit any personal data. The only personal data we ever collect is an email address you choose to give us on one of our websites, described under Email. This policy explains both.

Camera access

Wavelength uses your iPhone camera to measure ambient light levels and estimate melanopic lux from the color temperature and exposure parameters reported by the camera hardware. Camera data is processed entirely on your device in real time. No images or video are captured, stored, or transmitted.

Sleep schedule data

You may enter your current bedtime and target bedtime within the app. This information is stored locally on your device and synced across your own devices via iCloud (using CloudKit). It is not accessible to Impulse Arc LLC or any third party.

Notifications

If you enable notifications, Wavelength schedules local notifications on your device for light exposure reminders. These are generated and delivered entirely by iOS. No notification data is sent to any server.

Email

If you enter your email address on one of our websites, we store it solely to reply to you and send occasional notes about the app. It is held by our hosting provider, Cloudflare, is never sold or shared, and is not used for advertising. Ask us to delete it at any time by emailing [email protected].

Analytics and tracking

Wavelength does not include any analytics frameworks, advertising SDKs, or third-party tracking. We do not collect usage data, crash reports, or device identifiers.

Data sharing

We do not sell or share your personal information. The only personal data we may hold is an email address you optionally provide on one of our websites, described under Email.

Children

The Wavelength app does not collect personal information from anyone, including children under 13.

Changes

If this policy changes, the updated version will be posted at this URL with a new effective date.

Contact

Questions about this policy: [email protected]