Linux beta is here
Free & open source
Zero blue light.
No PWM flicker.
Tap Zap removes blue light completely and stops the invisible flicker that happens when you dim your screen.
See it in action
Existing solutions leave gaps.
Night Shift, f.lux, and built-in filters reduce color temperature. They don't eliminate blue light. And none of them do anything about the flicker.
Blue light persists
Even at warmest settings, Night Shift stops at ~2500K and f.lux at ~2000K. Blue wavelengths remain on screen. Reduced is not eliminated.
PWM flicker ignored
When you dim your screen, most LED panels use pulse-width modulation. This creates invisible flicker that no color filter addresses.
Heavy, clunky apps
Most blue light filters are large software with complicated interfaces that make your computer slow.
Tap Zap solves all three.
Tap Zap controls your display directly at the system level. Removes blue light at the wavelength level. Locks the backlight so PWM never engages.
Blue light and PWM flicker.
Nothing else.
True 0K red. Not warm. RED.
Most filters tint your screen. Tap Zap removes blue and green light entirely. At full warmth, only red wavelengths reach your eyes. Drag the slider, watch the spectrum collapse.
HPCS-330P spectrometer · Tap Zap at 0K
Backlight locked. Software dims. Zero flicker.
When you dim your screen, the LED behind it isn't actually dim — it's flickering on and off too fast to see, but your eyes still feel it. Tap Zap keeps the LED at full power and dims in software instead, so the flicker never starts. Works on built-in laptop panels (Mac and Windows), most external monitors on Windows with DDC/CI support, and Apple's Studio Display and Pro Display XDR.
PWM-Safe Mode · backlight stays at 100%
Everything else you'd expect.
Multi-Monitor
Plug in a second monitor and Tap Zap applies to it instantly. Unplug it, plug it back in — no restart, no reconfigure.
Native Performance
Uses less than 1% of your CPU. Doesn't drain your battery. Built natively for each platform — feels like part of the OS, not bolted on.
No Bloat
Two sliders, three presets, one ZAP button. Open the menu bar icon, drag, done. Quit the app and your screen reverts instantly.
Instant Response
Drag the slider, the screen changes the moment you do.
Mac. Windows. Linux.
MacOS 10.13+ with a separate legacy test build for older Macs. Windows 10+, plus a free, open-source Linux beta.
Lifetime Updates
One purchase. Every future update included. No subscription, no account, no recurring fee.
Auto Schedule
Set daily times for Day, Evening and Night on Mac and Windows. Keep Tap Zap running and it changes your screen warmth automatically.
What people are saying
Lucy Seabrooke@LucySeabrooke · X
“Simple, beautifully designed and incredibly effective.”
Natalie GJack Kruse forum
“Simple set up, easy to use, and I love that you don't need an account or yearly subscription.”
One Light@KrishnaIsGod108 · X
“TAP ZAP is actually amazing, beyond expectation!”
Dr. Ammous@AmmousMD · X
“Works better than other apps I have tried.”
Jake Hanna@TheJakeHanna · X
“Just deleted flux and got tap zap it is awesome!”
Nicholas Ho@nicholashojx · X
“Best investment ever.”
JeffRouseMDJack Kruse forum
“simple, easy to install, good UX. Kudos.”
Optimal Dwelling Spaces@OdSpaces · X
“Rusty's new Tap Zap is really good”
KodyX@KodyRayz · X
“Got tapzap w/Lightening. Much love”
PratimaJack Kruse forum
“paid, installed, operating without issue. Awesome. F.lux is uninstalled.”
@EdFlint384525X
“TapZap is awesome.”
Nexus@oxy_info · X
“Thank you so much for solving one huge issue I've had for so many years, Rusty!”
RF Safe@rfsafe · X
“Super cool app and easy to use!”
Dejenny@Onedejenny · X
“Just bought the app and the no flicker is something I’ve always wanted to have!”
Circadian Savage@CircadianSavage · X
“works dynamite bro”
Ricardo Trevino@ricardotch80 · X
“One week using TAP ZAP app... My experience? Beyond good.”
SunGod Psychopath@sungodreborn · X
“Just installed it. Crushed Iris. Way better.”
Johan Blank@northofswedenv · X
“totally in a league of its own, incomparable to other solutions I’ve tried in the past.”
EveeJack Kruse forum
“Thanks for making this - Just bought!”
Coach David@LiveChrgd · X
“Phenomenal app for computer use. Instant relief. Highly recommend!”
Christian Arnold@xtianiswriting · X
“can confirm zap is better than iris, and ofc way cheaper long term”
Zaid K. Dahhaj@zaidkdahhaj · X
“Just deleted f.lux. Tap Zap is genuinely better than all the other options on the market”
Ben Justman@BenJustman · X
“Just downloaded your app and love it.”
YaManJack Kruse forum
“well worth the money … it works much better than f.lux IMO.”
Bhavan@BhavanChand · X
“Tap Zap working great on external monitor too!”
Simon Tydd@Physiotydd · X
“AND when I connect my laptop to the TV and watch YouTube the TV screen is red too”
tom chojnacki@tomcho · X
“game changer, thanks for building this.”
Josh@nma_fyi · X
“This is excellent. Thank you for making this. An absolute no-brainer purchase.”
Late Bloomer Show@LateBloomerShow · X
“Got my Tap Zap on!”
burnermartian@burnermartian · X
“I work on my laptop and this app has had a major impact on my eyes”
Esther Bartkiw@seasunsoulful · X
“Tap Zap for my PC is exactly what I have been waiting for!”
alexander@alexvanaken · X
“I got it this morning and it's really the best.”
NURUT Massage Therapist@getnurut · X
“Just got mine last night and the difference on the display is great‼️”
Markets & Mito Maniac@RCompunder · X
“The app is great, the pricing is great, 100% recommendation!”
Cody Oakland@thecodyoakland · X
“Just bought it. Very cool. Now I can cancel iristech”
Aastha JS@aasthajs · X
Ali Jaffery@AliJaff31167076 · X“And I recently switched from Iris to TAPZAP (by the incredible @ze_rusty) for my flicker-free software dimmer. It’s much simpler to use!”
“Bought Tapzap for home use and will be buying it for my medical office soon as well! Thank you for an amazing product.”
A.S.I. GOD@A___S___I · X
“Thanx! Working great on Linux Bazzite KDE.”
Matthew Haley@MatthewHaley00 · X
“It is working great on Linux Mint x11!”
Kevin Mitnick@urcybersaviour · X
“Linux user here — installed Tap Zap and it changed my life.”
Pay once.
Use it forever.
Both include the full app for Mac and Windows and lifetime updates. The difference is how many computers you can use.
- Up to 3 computers
- One license key
- All features on Mac and Windows
- Lifetime updates included
- Unlimited computers instead of 3
- One license key for all seats
- All features on Mac and Windows
- Lifetime updates included
On Linux? Get the free, open-source beta