A New Era of
Display Health.
Remove screen flicker and 97% of blue light.
Better sleep, sharper focus, calmer eyes.
📱 On your phone?
Sundown is a Mac app — but you can buy now and install when you're at your Mac.
Buy Now — Install LaterFeel the difference.
Same color science as the real app. Drag the warmth slider to watch your screen transform.
“Trust your evenings.”
See the difference tonight. Cancel anytime.
Join the first hundred protecting
their sleep with Sundown
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%.
97% blue light blocked. Free trial. Your sleep will thank you.
Finally, real blue light blocking
Alex T., June 2026
“I've tried f.lux, Night Shift, Iris — nothing comes close. Sundown actually blocks 97% of blue light. My sleep improved the first night. The flicker-free mode is a game changer for late-night coding.”
The display app Mac should've shipped with
Jordan M., May 2026
“This app is superb. It's not long been released but is very polished. Great interface and the developer has a great roadmap that aspires to be the best of its kind.”
Eliminated my evening headaches
Dr. Sarah K., June 2026
“As a researcher studying circadian disruption, I'm impressed. Most blue light apps are theater — Sundown actually shifts the spectrum to 500K. The flicker-free mode eliminates PWM headaches completely.”
One slider. No account. Just works.
Marcus D., May 2026
“Brilliant. So easy to use, super practical. Couldn't have made it any easier to implement and set up. No sign-ups, no data collection — just a slider that protects your eyes.”
Night Shift is a joke compared to this
Nina R., June 2026
“Night Shift maxes out at a mild warm orange. Sundown goes deep red — 500K. You can actually feel the difference. My melatonin levels are up and I'm falling asleep faster every night.”
Built for biohackers, by biohackers
Matt W., June 2026
“97% blue light blocked. Anti-dithering for Apple Silicon. Flicker-free gamma dimming. This is what real display health looks like. Every biohacker I know has switched to Sundown.”
Finally, real blue light blocking
Alex T., June 2026
“I've tried f.lux, Night Shift, Iris — nothing comes close. Sundown actually blocks 97% of blue light. My sleep improved the first night. The flicker-free mode is a game changer for late-night coding.”
The display app Mac should've shipped with
Jordan M., May 2026
“This app is superb. It's not long been released but is very polished. Great interface and the developer has a great roadmap that aspires to be the best of its kind.”
Eliminated my evening headaches
Dr. Sarah K., June 2026
“As a researcher studying circadian disruption, I'm impressed. Most blue light apps are theater — Sundown actually shifts the spectrum to 500K. The flicker-free mode eliminates PWM headaches completely.”
One slider. No account. Just works.
Marcus D., May 2026
“Brilliant. So easy to use, super practical. Couldn't have made it any easier to implement and set up. No sign-ups, no data collection — just a slider that protects your eyes.”
Night Shift is a joke compared to this
Nina R., June 2026
“Night Shift maxes out at a mild warm orange. Sundown goes deep red — 500K. You can actually feel the difference. My melatonin levels are up and I'm falling asleep faster every night.”
Built for biohackers, by biohackers
Matt W., June 2026
“97% blue light blocked. Anti-dithering for Apple Silicon. Flicker-free gamma dimming. This is what real display health looks like. Every biohacker I know has switched to Sundown.”
Your eyes feel soothed in seconds. Within a few days: 58% more melatonin. Falling asleep 7 minutes faster. 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 increases melatonin production by 58% and helps you fall asleep 7 minutes faster (Burkhart & Phelps 2009). 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.
Not sure about Sundown? Ask an AI.
Don't take our word for it. Ask an independent AI — the question is prefilled.
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