Night Shift: 2500K. f.lux: 2000K. Tap Zap: 0K.

When you have to use a screen, make it safe.

REDUCED ≠ GONE.

Other filters reduce blue light. Tap Zap 2 eliminates it. True 0K red means zero blue wavelengths reaching your eyes.

Eliminate Blue Light -> Compare Filters
macOS 12+
Windows 10+
<1MB
TAP ZAP 2
ON
Color Temperature
Brightness
(PWM Flicker)
0K
100%
In the real app, this achieves true 0K red — complete blue elimination.
0K
True Red Achievable
100%
Blue Light Blocked
<1MB
App Size
0
Data Collected
The Problem

Your screen emits light you can't fully control.

Blue wavelengths (400-495nm) suppress melatonin production. PWM flicker causes eye strain. Built-in solutions don't go far enough.

//

Blue Light Exposure

Night Shift and f.lux reduce color temperature but can't eliminate blue entirely. Residual blue pixels remain on screen at all settings.

~~

PWM Flicker

Most LED displays use pulse-width modulation for brightness control. This invisible flicker at 200-1000Hz causes headaches and visual fatigue.

[]

Limited Control

Built-in filters offer schedules and presets but no precision. You can't manually dial in the exact color temperature and brightness you need.

Capabilities

Direct control over your display output.

Tap Zap 2 manipulates gamma tables at the system level via CoreGraphics (macOS) and SetDeviceGammaRamp (Windows).

100% Blue Light Block

True 0K red achieved by completely eliminating blue and green channels via gamma transformation.

PWM Flicker Control

Software brightness via gamma dimming. Set hardware to 100%, use Tap Zap for flicker-free dimming.

True 0K Red

Full range from 6500K daylight to 0K pure red. At max intensity, only red wavelengths remain.

Multi-Monitor

Automatic detection and application across all connected displays with hot-plug support.

Native Performance

SwiftUI for macOS, WPF for Windows. No Electron. Less than 1% CPU usage during operation.

<1MB Size

Minimal footprint. No bloat. Downloads in seconds. Respects your disk space.

Instant Response

No debouncing on filter application. Gamma tables update in real-time as you adjust sliders.

Cross-Platform

Native apps for macOS 12+ and Windows 10+. Same presets, same precision, different APIs.

Lifetime Updates

One purchase, forever yours. All future updates included. No subscriptions.

Comparison

How Tap Zap 2 compares to alternatives.

See how we stack up against the most common blue light filters on the market.

Application Min Color Temp Blue Elimination PWM Control App Size Price
Tap Zap 2 0K (True Red) YES YES <1MB $39-$59
f.lux ~2000K Partial --- ~2MB Free
Iris ~1000K High YES ~50MB $15-$89
Night Shift (macOS) ~2500K Partial --- Built-in Free
Night Light (Windows) ~1200K Partial --- Built-in Free
Pricing

One purchase. Lifetime updates.

No subscriptions. No recurring fees. Buy once, use forever across macOS and Windows.

Limited Time
Early Bird
$39
One-time payment
  • macOS + Windows licenses
  • 3 device activations
  • Lifetime updates included
  • Email support
  • 30-day money-back guarantee
Get Early Access ->
Regular Price
$59
After early bird ends
  • macOS + Windows licenses
  • 3 device activations
  • Lifetime updates included
  • Email support
  • 30-day money-back guarantee
Join Waitlist ->
FAQ

Frequently asked questions.

That's intentional. To eliminate 100% of blue light, the screen must display only red wavelengths. Adjust the left slider (color temperature) to dial in your preferred level of warmth. At 6500K, you'll see normal colors.
Yes. Tap Zap 2 automatically detects and applies filters to all connected displays. Hot-plug support means you can connect or disconnect monitors without restarting the application.
Most LED displays use PWM (pulse-width modulation) to control brightness, which causes invisible flicker. Setting hardware brightness to 100% disables PWM. Tap Zap 2's software brightness slider then controls dimming without any flicker.
Tap Zap 2 achieves true 0K red (100% blue elimination), while Night Shift maxes at ~2500K and f.lux at ~2000K. We also provide PWM flicker control, which they don't address at all.
No. Gamma adjustments are handled by the GPU with negligible CPU usage. Tap Zap 2 uses less than 1% CPU on average. The native implementation ensures minimal impact on battery life.
Not recommended. They manipulate the same gamma tables, which causes conflicts. Disable built-in filters before using Tap Zap 2 for best results and accurate color temperature control.
macOS 12+ (Monterey and later) and Windows 10+ are fully supported. The macOS version uses CoreGraphics gamma APIs, while Windows uses SetDeviceGammaRamp and the Magnification API for brightness.
Yes. We offer a 30-day money-back guarantee, no questions asked. If Tap Zap 2 doesn't meet your needs, contact support and we'll process your refund immediately.