Migraine screen filter
for macOS
Certain wavelengths of screen light can aggravate light sensitivity. Nox lets you filter them precisely — FL-41 tint, 480nm notch filter, narrow-band green, and 9 more presets. Similar to tint glasses, built into your Mac.
Spectral filtering
Filters specific wavelengths across the full visible spectrum, not just color temperature.
Melanopic tracking
Live readout of how much melanopsin-activating light your current filter removes.
12 presets
FL-41, 480nm notch, narrow-band green, e-paper simulation, and more.
Custom presets
Full control over RGB channels, gamma curve, contrast, and color temperature.
Targeting the
root of photophobia
Not all wavelengths affect your eyes the same way. Research points to specific parts of the spectrum and specific cells.
Real-time percentage of melanopsin-activating light blocked by your current filter and intensity settings.
Your retina contains specialized light-sensing cells called ipRGCs that are most sensitive to blue-cyan light at 480nm. Research suggests these cells may play a role in light sensitivity for some people, amplifying discomfort when exposed to certain wavelengths.
Studies have found that narrow-band green light (~530nm) may be better tolerated than other wavelengths. Blue, amber, and red were associated with greater discomfort in some subjects. This is why a simple "warm filter" may not be enough — wavelength-level control gives you more options.
FL-41 tinted lenses, a rose-colored filter, were associated with a 74% reduction in migraine frequency in one clinical study. Nox applies similar filtering principles to your display, using spectral curve modeling to approximate per-channel attenuation.
Beyond blue light filters
f.lux and Night Shift shift color temperature. Nox filters specific wavelengths. Read the full comparison: Nox vs f.lux · Nox vs Night Shift
| Feature | f.lux | Night Shift | Iris | Nox |
|---|---|---|---|---|
| Migraine-specific presets | — | — | — | 12 presets |
| FL-41 tint emulation | — | — | — | ✓ |
| 480nm notch filter | — | — | — | ✓ |
| Melanopsin suppression metric | — | — | — | Real-time % |
| Spectral curve modeling | — | — | — | 380–780nm |
| Narrow-band green mode | — | — | — | 520–540nm |
| Custom preset creation | — | — | Limited | Full RGB + gamma + temp |
| Price | Free | Free | $15 | $5 |
12 presets for every
kind of screen sensitivity
From research-backed migraine filters to e-paper simulation and low-fatigue gaming modes. Pick one, tweak it, or build your own.
Every preset is fully customizable. Adjust intensity, dimming, black point, contrast, gamma, color temperature, and per-channel levels — or create your own from scratch.
- All 12 research-based presets
- Unlimited custom presets
- Melanopic suppression tracking
- Break timer reminders
- Multi-display support
- Global keyboard shortcut
14 days free · Full features · No credit card
Buy License — $5Nox applies filter profiles based on published research on light sensitivity. It is not a medical device and does not diagnose, treat, or cure any condition. Consult your physician regarding migraine management.
Common questions
Does Nox work like FL-41 glasses?
How is Nox different from f.lux or Night Shift?
What is melanopic suppression?
Will Nox cure my migraines?
Does it work on external monitors?
Can I create my own filter presets?
Guides and research
Research-backed articles on migraine photophobia, screen settings, and spectral filtering.
Best Screen Settings for Migraines
Adjust brightness, enable spectral filtering, and configure your Mac to reduce screen-related discomfort.
FL-41 Tint for Your Screen
FL-41 lenses reduced migraines by 74% in trials. Nox brings the same spectral profile to your Mac display.
Eye Strain from Screens: Causes and Solutions
Up to 90% of people who use computers for 3+ hours daily experience digital eye strain. Here is what actually helps.
Do Blue Light Glasses Actually Work?
The evidence for and against blue light glasses, and why precision spectral filtering works better for migraines.
Stop burning
your eyes out
The same spectral filtering principles used in $400+ therapeutic tint glasses — running natively on your Mac.
Already using Nox? Buy license ($5)