Software for a
healthier screen.
Deep red down to 500K, anti-dithering, and dimming that keeps the backlight steady. Feel better, think clearer, sleep deeper.
Coming to Windows — get early access →
Screen time shouldn't cost
you sleep
Real people. Real results. Your screen was the problem.
Your screen shouldn't ruin your sleep.
Blue light after sunset suppresses melatonin, disrupts your circadian rhythm, and causes eye strain, headaches, and poor sleep.
Poor Sleep
Blue light at night holds back melatonin. After two weeks wearing amber glasses before bed, healthy adults had ~58% higher nighttime melatonin and slept ~24 minutes longer (Ostrin 2017).
Eye Strain
Screen flicker and blue wavelengths fatigue your retinas. Dimming makes it worse.
Disrupted Rhythm
Evening blue light tells your body it is still daytime, so the signal to wind down comes late.
Night Shift barely helps — it only goes to 2700K. Your biology needs 500K.
7-day free trial · Cancel anytime before you're charged
Work until midnight.
Sleep like you didn't.
Your screen floods you with blue light every evening. Night Shift barely dims it. Sundown goes to 500K — real circadian protection that lets you work without the damage.
Install
Download. Drag to Applications. Done in under 3 minutes.
Set your warmth
One slider. From gentle amber to deep crimson. You choose how deep.
Forget about it
Pick a preset once. Sundown holds your warmth until you change it.
The display app for better focus and deeper sleep.
Engineered for your biology.
Better Sleep
Deep red at 500K
500K deep red is the deepest warm setting available on macOS. The evidence for blocking evening blue light comes from Ostrin 2017, a two-week amber-glasses study: ~58% higher nighttime melatonin and ~24 minutes longer sleep.
Calmer Evenings
Warm, dim, easy to put down
A warm, dim screen after dark is easier on the eyes and easier to walk away from.
Steady Backlight
Gamma dimming, not pulsing
Gamma dimming keeps the backlight steady, so Sundown's dimming adds no PWM pulsing of its own.
Flicker-Free
Dims with gamma, not the backlight
Many screens get darker by pulsing the backlight on and off. Sundown darkens the picture through the gamma curve instead, so the backlight can stay where it is.
Deep Protection
500K deep red
Night Shift stops at 2700K. Sundown goes to 500K — the deepest red-shift available on Mac.
Anti-Dithering
Smooth color, no banding
Apple Silicon gamma curves cause visible banding. Sundown's anti-dithering algorithm eliminates it.
Real protection your biology can feel. Free for 7 days.
Start protecting your eyes tonight.
7-day free trial on monthly and annual. Cancel anytime.
Monthly
Billed monthly after trial
- ✓ Full screen tinting
- ✓ Auto-sunset scheduling
- ✓ All presets & scenes
- ✓ Flicker-free mode
Annual
$3.25/mo — best value
- ✓ Everything in Monthly
- ✓ Save 34%
- ✓ Priority support
- ✓ Early access
Lifetime
Pay once, own it forever
- ✓ Everything in Annual
- ✓ Lifetime updates
- ✓ No recurring charges
- ✓ Founding member
What changes the night you install Sundown.
Not all screen filters protect your biology. Here's the difference between dimming your screen and actually protecting your circadian rhythm.
| Sundown | Night Shift | f.lux | Iris | |
|---|---|---|---|---|
| Warmest setting | 500K | — | — | — |
| Deepest Kelvin | 500K | 2700K | 1200K | 1200K |
| Flicker-Free | ✅ | ❌ | ❌ | ❌ |
| Anti-Dithering | ✅ | ❌ | ❌ | ❌ |
| Custom Presets | 8 Kelvin presets | 1 slider | 3 modes | 9 presets |
| Scheduling | Custom | Basic | ✅ | ✅ |
| macOS Native ARM | ✅ Native | Built-in | Universal | x86 (Rosetta) |
| Tracking | None | Apple | Minimal | Google Analytics |
| Price | From $4.99/mo | Free (personal) | Free (personal) | From $4.99/mo |
Night Shift stops at roughly 2700K. Sundown reaches 500K.
Finally, real blue light blocking
Alex T., June 2026
“I've used f.lux for years and thought my screen was fine. Then I tried Sundown and realized I was still getting wrecked. First night with it on I fell asleep without even trying. That never happens to me.”
The display app Mac should've shipped with
Jordan M., May 2026
“I wanted something simple that just sits in the menu bar and does its thing. Sundown does exactly that. Set it up in like 30 seconds and haven't thought about it since. My eyes just stopped hurting at night.”
Eliminated my evening headaches
Dr. Sarah K., June 2026
“I study light exposure for a living and most of these apps are basically cosmetic. Sundown is the first one I've seen that actually goes deep enough to matter. My evening headaches are gone.”
One slider. No account. Just works.
Marcus D., May 2026
“Brilliant. So easy to use, super practical. No sign ups, no accounts, nothing. Just a slider that protects your eyes. Couldn't have made it simpler.”
Night Shift is a joke compared to this
Nina R., June 2026
“I thought Night Shift was doing something. Then I turned on Sundown and the difference hit me immediately. The screen goes this deep warm red and you can feel your eyes relax. I sleep so much better now it's honestly annoying I didn't find this sooner.”
Built for biohackers, by biohackers
Matt W., June 2026
“I've been deep in the biohacking space for years and this is the only screen app I actually recommend. Three of my friends switched after seeing my setup. It just works and it goes way deeper than anything else out there.”
Finally, real blue light blocking
Alex T., June 2026
“I've used f.lux for years and thought my screen was fine. Then I tried Sundown and realized I was still getting wrecked. First night with it on I fell asleep without even trying. That never happens to me.”
The display app Mac should've shipped with
Jordan M., May 2026
“I wanted something simple that just sits in the menu bar and does its thing. Sundown does exactly that. Set it up in like 30 seconds and haven't thought about it since. My eyes just stopped hurting at night.”
Eliminated my evening headaches
Dr. Sarah K., June 2026
“I study light exposure for a living and most of these apps are basically cosmetic. Sundown is the first one I've seen that actually goes deep enough to matter. My evening headaches are gone.”
One slider. No account. Just works.
Marcus D., May 2026
“Brilliant. So easy to use, super practical. No sign ups, no accounts, nothing. Just a slider that protects your eyes. Couldn't have made it simpler.”
Night Shift is a joke compared to this
Nina R., June 2026
“I thought Night Shift was doing something. Then I turned on Sundown and the difference hit me immediately. The screen goes this deep warm red and you can feel your eyes relax. I sleep so much better now it's honestly annoying I didn't find this sooner.”
Built for biohackers, by biohackers
Matt W., June 2026
“I've been deep in the biohacking space for years and this is the only screen app I actually recommend. Three of my friends switched after seeing my setup. It just works and it goes way deeper than anything else out there.”
Your screen goes warm and steady the moment you turn it on. The sleep evidence behind blocking evening blue light: ~58% higher nighttime melatonin and ~24 minutes longer sleep after two weeks (Ostrin 2017, amber glasses).
The science your screen company won't tell you.
One email a week. The research behind blue light, melatonin, and screen health — written for people who actually read the studies. Free forever.
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Circadian technology is evolving.
We're exploring the science of light, sleep, and eye-friendly displays. Our relationship with screens is changing — here's what we're learning.
Best Blue Light App for Mac in 2026
A comprehensive comparison of every blue light filter available for macOS.
The Science of Display Dithering
Why Apple Silicon gamma curves cause visible banding and how to fix it.
f.lux Alternative for Mac
Why biohackers are switching from f.lux to deeper circadian protection.
More from the blog
- How to Turn On Night Shift on a Mac (and Off Again)
- Do Blue Light Glasses Work? Glasses vs Screen Warmth
- Color Temperature Explained: What Kelvin Means for Your Mac
- Computer Vision Syndrome on a Mac: What the Research Says
- Dark Mode vs Night Shift vs True Tone on Mac
- Delayed Sleep Phase and Your Mac Screen at Night
- Does Dark Mode Reduce Blue Light? What We Measured on a Mac
- Screen Time Before Bed: A Mac Evening Routine by Kelvin
- Shift Work Sleep and Your Mac Screen: A Kelvin Guide
- f.lux for Mac: How to Download It, and What Happened to It
- Best Blue Light Filter for Mac 2026: Night Shift vs f.lux vs Sundown vs CircadianShield
- MacBook Pro Yellow Screen: Why It Looks Yellow and How to Fix It
- Blue Light Filter for Computer Screen: Which Type Actually Works?
- PWM Monitor Flicker: Why Your Screen Hurts (And How to Fix It)
- Best Circadian Health Apps in 2026: 9 Tools That Actually Work
- Best Screen Dimmer Apps for Mac in 2026: 6 Tools Compared
- How to Reduce Eye Strain on Mac: 7 Settings to Change (2026)
- Blue Light Filter for MacBook: Beyond Night Shift (2026 Guide)
- Best Mac Display Health App 2026: Complete Guide
- Night Shift Alternative for Mac: Why Apple's Built-In Filter Isn't Enough (2026)
- Sundown vs Iris for Mac (2026): What Happened to Iris and What to Use Now
- Mac Blue Light Filter: 3 Methods That Actually Work (2026 Guide)
- Blue Light and Sleep: What Your Mac Display Does to You
- How to Make Mac Night Mode Darker — Beyond Dark Mode
- Red Screen Filter for Mac: Deep Red at 500K
- Flicker-Free Mode for Mac: How Sundown Dims Through Gamma Instead of the Backlight
- How to Reduce Blue Light on MacBook Pro: 6500K to 500K
- Fix Screen Flicker Headaches on MacBook (2026 Guide)
- Night Shift vs f.lux on Mac (2026): Full Comparison
Questions
How is Sundown different from Night Shift?+
How does Sundown dim the screen?+
Do blue light glasses protect my skin?+
Does Sundown track me?+
Will this actually improve my sleep?+
Which macOS versions does Sundown run on?+
- macOS 26 Tahoe — Sundown
- macOS 15 Sequoia — Sundown
- macOS 14 Sonoma — Sundown
- macOS 13 Ventura — Sundown Classic
- macOS 12 Monterey — Sundown Classic
Apple Silicon and Intel Macs.
We're constantly updating which versions of macOS Sundown runs on. If it doesn't work on yours, please email us at support@trysundown.com.
Can I get a refund?+
Loved by people who take their sleep seriously.
Here's what Sundown users are saying.
“So much better than flux. This is what I've been looking for.”
Cameron Cruz
@cameroncruz
“I've been obsessed with Sundown! Actually life changing. I need to start sharing it. Finally creating content again.”
Nat Larcos
@natlarcos
“Sundown is sick. Shared it with a couple of my buddies as well. Word of mouth is the best marketing.”
James
@sonofjvmes
“As someone who’s built a company around circadian health, Sundown is the real deal. Nothing else comes close on software.”
“ok so I started using this because I read about blue light aging your skin and now I genuinely look forward to working on my laptop at night? the warm glow is so cozy. my whole evening routine feels different.”
Ruby Rojas
@itsrubyrojas
“I spend 10+ hours a day editing video on my Mac. Sundown runs in the background and I genuinely sleep better. Simple as that.”
Christian LeBlanc
@lostleblanc
“I set the sunset schedule and honestly forgot it was even there for a week. Then I realized my eyes hadn’t been burning at night. That’s when I knew this thing was actually working.”
Shaiden Valentine
@shaiden
“I used to get headaches every single night around 9pm. Like clockwork. Installed Sundown two weeks ago and they just stopped. I think it’s the flicker thing? whatever it is, it works.”
Jasmine
@jasminegabs
“this is my favorite app on my entire mac and i’m not even exaggerating. the warm screen at night is so nice. i’ve gotten like four of my friends to download it.”
Jianna Capri
@jiannacapri
Protect your night.
Power your day.
Darker screen. Deeper sleep. Sharper morning.
7-day free trial. 30-second setup. Feel the difference tonight.
Try Sundown Free