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How to add a real CRT effect to your Mac (2026 guide)

Modern displays are too sharp. If you grew up with a tube monitor, you remember the warm glow, the soft scanlines, the way pixels actually breathed. This is a quick guide to bringing that back on a 2026 Mac with a real GPU-accelerated CRT shader - no Photoshop overlay, no video export.

What is a CRT effect?

A CRT effect simulates the way old cathode-ray tube monitors displayed an image: horizontal scanlines, a shadow-mask or aperture-grille phosphor pattern, subtle bloom, and a bit of composite color bleed. Done well it makes pixel art look alive again and gives modern UI a warm, tactile quality.

On a Mac, the cleanest way to get this is a live shader that renders on top of everything you see. RetroMac uses Metal for that, so it stays smooth even at 4K.

How to enable it in RetroMac (step-by-step)

  1. Install RetroMac from myretromac.app/download and drag it to Applications.
  2. Open the shader panel from the menu bar icon → Effects.
  3. Pick a CRT preset - start with Sony Trinitron or NTSC Composite.
  4. Scope the effect: whole screen, one display, or one app.
  5. Save your preset so it survives restart.

Best CRT presets to start with

  • Sony Trinitron - aperture grille, warm, great for photography.
  • NTSC Composite - color bleed and dot crawl, perfect for retro games.
  • Amber Monochrome - the terminal look; pairs nicely with iTerm.
  • Broadcast VHS - softer, slightly warped, tape-like.

Performance on Apple Silicon

On M1 and up, the CRT shader typically costs 1-3% GPU. Battery-aware eco mode reduces intensity when you unplug. If you have a 5K or 6K display, prefer the "aperture" variants over "shadow mask" - they scale better.

Try RetroMac yourself

Free · macOS 14+ · No account, no telemetry

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FAQ

Does a CRT effect slow down my Mac?

On modern Apple Silicon, no - the shader is GPU-accelerated. Eco modes throttle it on battery.

Can I use a CRT effect on just one window?

Yes, RetroMac lets you scope the shader to a single window or app.

Will screenshots capture the CRT effect?

Yes - macOS records what's on screen, so both screenshots and screen recordings include the shader.

Which macOS versions are supported?

macOS 14 or newer. Native on Apple Silicon (M1-M4) and Intel.

M

Written by Maik

I build RetroMac & Reframe. Say hi →

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