f.lux vs Night Shift vs Other Blue Light Apps on Mac: The Full Comparison

Most people searching this want one answer: f.lux or Night Shift? Short version — they warm your screen in a similar way, f.lux gives you far more control and stays on all day, and Night Shift is built in but won’t stay on. Below is the head-to-head, then the other options worth knowing about: Iris, Dimmer, and macOS’s own Color Filters.

f.lux vs Night Shift: Head to Head

Pick f.lux if you want fine control — different temperatures through the day, very warm settings late at night, or exceptions for specific apps. Pick Night Shift if you want the simplest option with nothing extra installed. If the only thing you liked about f.lux was that it stays on, Night Shift plus a keeper app gives you that without switching tools.

Every Option at a Glance

f.lux: The Veteran

f.lux is the app that started it all. It automatically adjusts your screen’s color temperature based on your location and the time of day, gradually warming the display as evening approaches.

Pros:

• Highly configurable — set exact Kelvin values for day, sunset, and sleep modes.
• Stays on 24/7 without needing a helper app.
• Free to use.
• "Darkroom" mode for extreme low-light environments.

Cons:

• Another background app: f.lux has to keep running to manage your screen color. On modern Macs its resource use is small, but it’s one more thing installed and running.
• The UI feels dated compared to modern macOS apps.
• Can conflict with color-critical work (design, photo editing).

Bottom line: Great free option for power users who want deep control and don’t mind a third-party background process.

macOS Night Shift: The Native Option

Apple’s Night Shift is built directly into macOS and shifts your display’s colors inside the system’s own display pipeline — nothing to install and no extra app running.

Pros:

• Nothing extra running — it’s part of macOS.
• Fully integrated with Control Center and System Settings.
• No installation required.

Cons:

• Won’t stay on 24/7. macOS disables Night Shift during the day and resets it after sleep or restart.
• Limited scheduling — only "Sunset to Sunrise" or a fixed window.
• Less granular control over temperature compared to f.lux or Iris.

Bottom line: The simplest, built-in choice — but the scheduling limitation frustrates people who want it always on.

Iris: The Feature-Rich Alternative

Iris goes beyond color temperature. It also handles brightness, offers a range of preset modes for different times of day, and has a flicker-related setting aimed at people sensitive to screen dimming.

Pros:

• Most feature-complete blue light solution available.
• Controls software brightness below the hardware minimum.
• Lots of fine-grained settings for people who want to tune everything.

Cons:

• Paid — check the developer’s site for current pricing.
• More complexity than most users need.

Bottom line: Best for people who want maximum control and don’t mind paying for it. More than most people need.

macOS Color Filters: The Overlooked Free Option

Under System Settings → Accessibility → Display → Color Filters, macOS can apply a Color Tint that stays on permanently. Pick an amber color and lower the intensity. It’s free and it never turns off, but it’s a flat tint rather than a true color-temperature shift, so whites look muddier than with Night Shift or f.lux.

Dimmer & Similar Minimal Apps

Apps like Dimmer focus purely on reducing screen brightness below the hardware minimum using a dark overlay. They don’t shift color temperature — they just make the screen dimmer. Useful for late-night use in dark rooms but not a blue light solution on their own.

The Verdict

For most Mac users, the simplest setup is macOS Night Shift kept on 24/7: the warming is built into the system, there’s nothing to configure beyond one slider, and the look is the one you already know. The only problem is that Apple won’t let you keep it on permanently — which is exactly the problem Night Shift Keeper solves.

If you want fine control over color temperature through the day, f.lux is excellent and free. If you want even more knobs and don’t mind paying, look at Iris. If you want a free tint that never turns off and can live with the look, try Color Filters.