Red screen test
Test if your red screen filter is working properly. If you can't see the blue block below, your red screen protection is blocking blue light effectively.
Click anywhere on the screen to exit fullscreen mode
How to test your red screen filter
- Enable your red screen filter (Lumiv, f.lux, Iris, or any blue light blocking software)
- Look at the blue block above or click "Show Full Screen Blue"
- If you can't see the blue (appears black/dark), your red screen filter is working properly and blocking blue light
- If you can still see blue, your filter is not blocking blue light effectively
Why use a red screen filter?
Red screen filters block all blue light from your display, protecting your melatonin production and sleep quality. Unlike Night Shift or partial filters, a true red screen completely removes blue wavelengths that disrupt your circadian rhythm at night.
What is a red screen?
A red screen is a display mode that shows only red wavelengths, completely blocking blue and green light. This creates a safe viewing environment at night that doesn't suppress melatonin or disrupt sleep. Our bodies are naturally adapted to red light from fire, making red screen the ideal nighttime display mode.
Automate your screen protection
Lumiv automatically adjusts your Mac screen based on your location and time of day, filtering harmful blue light to protect your eyes during work and support natural sleep at night.
Download Lumiv for Mac