Software for a
healthier screen.
Eliminate flicker, dithering, and 97% of blue light. 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 suppresses melatonin by up to 85%. Your brain thinks it's noon when it's midnight.
Eye Strain
Screen flicker and blue wavelengths fatigue your retinas. Dimming makes it worse.
Disrupted Rhythm
Evening blue light delays your circadian clock by 3 hours. Your body never gets the signal to wind down.
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
Auto-sunset mode activates at sunset, off at sunrise. Zero effort.
The display app for better focus and deeper sleep.
Engineered for your biology.
Better Sleep
~58% more melatonin
500K deep red blocks 97% of blue light. Your pineal gland produces the melatonin your body needs.
Better Focus
Lower cortisol, calmer mind
Blue light after dark spikes your stress hormone. Sundown removes the trigger.
Less Eye Strain
No more burning at 9pm
Gamma dimming keeps the backlight steady. Your retinas rest instead of pulsing.
Flicker-Free
Gamma curves, zero PWM
Most screens flicker 14,880 times per second when dimmed. Sundown dims without a single pulse.
Deep Protection
97% blue light at 500K
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. 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 | |
|---|---|---|---|---|
| Blue Light Blocked | 97% | ~40% | ~70% | ~80% |
| Deepest Kelvin | 500K | 2700K | 1200K | 1200K |
| Flicker-Free | ✅ | ❌ | ❌ | ❌ |
| Anti-Dithering | ✅ | ❌ | ❌ | ❌ |
| Custom Presets | 6 presets | 1 slider | 3 modes | 9 presets |
| Scheduling | ✅ Sunset/sunrise | 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 blocks ~40%. Sundown blocks 97%.
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 eyes feel soothed in seconds. Within a few days: ~58% more melatonin. ~24 min longer sleep. Waking up sharper.
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.
No spam. Unsubscribe anytime.
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.
Questions
How is Sundown different from Night Shift?+
Night Shift maxes out at 2700K — a mild warm orange that blocks about 40% of blue light. Sundown goes to 500K (deep red), blocking 97% of blue light across the full 400-500nm spectrum. Harvard researchers found evening blue light delays your circadian clock by 3 hours — twice as long as comparable green light (Lockley, Brainard & Czeisler, 2003). Sundown is built for people who take that seriously.
Does Sundown eliminate screen flicker?+
Yes. Most displays dim by flickering the backlight on and off 14,880 times per second (PWM). The lower your brightness, the worse the flicker. Your pupils dilate and contract with every cycle — that's the headaches and eye strain. Sundown dims through gamma curves instead. The backlight stays steady. Zero flicker, zero pulsing.
Do blue light glasses protect my skin?+
Blue light glasses are a great first step — they protect your retinas from the wavelengths that suppress melatonin. For full-body protection, pairing glasses with a screen-level filter like Sundown means blue light is reduced at the source, covering your eyes and skin together.
Does Sundown track me?+
No. Zero analytics, zero telemetry, zero network calls. Sundown runs entirely on your Mac. No accounts, no cloud sync, no data leaves your machine. Your screen settings are your business.
Will this actually improve my sleep?+
Research shows that properly blocking blue light before bed produces ~58% more melatonin and ~24 min longer sleep (Ostrin 2017). Sundown blocks 97% of blue light at 500K — far deeper than Night Shift's 40%.
Can I get a refund?+
Yes. 30-day money-back guarantee, no questions asked.
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. 97% blue light blocked. 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