Preserve Nightvision
Red Light Filter

Protect your night vision.

Preserve Nightvision is a minimal red screen filter built for astronomy, stargazing, camping, and other low-light use where harsh screen glare ruins dark adaptation.

What the app does

  • Applies a full-screen red filter to reduce bright screen glare.
  • Lets you adjust hue and intensity to match your environment.
  • Keeps the screen awake while the filter is in use.
  • Stays intentionally simple so it is quick to use in the dark.

Support

If you need help with Preserve Nightvision, use the support details below. Include your device model, operating system version, and a short description of the issue so it can be reproduced properly instead of guess-and-cope.

Support Contact
support@altelyra.com
Typical support topics: app behavior, store issues, feature questions, and bug reports.

Privacy Policy

Preserve Nightvision is designed to be lightweight and privacy-friendly. The app does not require account creation and does not collect personal content such as photos, contacts, messages, or location.

  • The app stores your selected filter settings, such as hue and intensity, locally on your device so your preferences persist between sessions.
  • The app does not currently require account creation and does not currently transmit your personal content to a remote server for its core functionality.
  • The app does not sell your personal information.
  • The app does not use your camera, microphone, contacts, or precise location for its core functionality.

If the app introduces new data practices in the future, this page will be updated before or alongside the relevant release.

Last updated: April 1, 2026