A session without another glowing rectangle
Ten, fifteen, or twenty minutes of full-screen red — the same practice window dedicated panels use. Hardware you already paid for.
Red light sessions on the display you already own
Fifteen minutes.
Your screen, full red.
Sit close. Brightness up. The closest visible red this Mac can emit — then Escape when you are done. Or keep working under a live red filter. No extra panel.
Free to start. No account. Works on macOS 14+. Get notified for the Mac App Store.
Display P3 (1, 0, 0)~614.9 nm15-minute session⌥⌘R live filter
Outcomes first
What you get from the screen on your desk.
Red while you keep working
⌥⌘R remaps the desktop to red, like an accessibility color filter. More time under visible red without blocking the afternoon.
Honest numbers, not a costume
We show target-versus-this-display instead of inventing 660 nm, 850 nm, or a fluence we have not measured.
Two ways
A timed session, or a live filter.
15-minute session
Full-screen Maximum Red — Display P3 (1, 0, 0). Sit close. Brightness to 100%. Night Shift, True Tone, and Invert Colors off. Dock and menu bar hide. Escape or Option-Command-Period exits.
Live red filter · ⌥⌘R
The desktop stays usable. The color is remapped to red. Option-Command-R toggles it. Option-Command-Period restores colors and ends a running session.
Straight answers
The three questions that should stop you.
Is this 660 nm?
Display P3 red’s published dominant wavelength is about 614.9 nm, inside the 600–700 nm window. That is the closest legitimate visible red this panel can be asked for. The app will not mix in green to “look like 660.” There is no 850 nm mode.
Is this medical?
No. This is a timed red-light session and wellness utility. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. People search the category as red light therapy. The research on dedicated panels is mixed too. We still ship the closest session this Mac can run.
Is a laptop enough?
A laptop is not a 300-LED panel. It will not invent irradiance we have not measured. It will run the 10–20 minute practice, at the closest red the hardware can emit, on the display you already own. Try that before buying another glowing rectangle.
Pricing
Free to start. Pro is $9.99 once.
Free
$0
- 15-minute full-screen session
- Live red filter (⌥⌘R)
- One display
Pro
$9.99
- Lifetime unlock — no subscription
- Display Boost, multi-display, saved routines
- History and display profiling
Use the display you already own.
Red light sessions on your Mac. Fifteen minutes, or a live filter. Get notified when it is on the Mac App Store.
Works on macOS 14+. Not a medical device.