RedDimmer
A warmer, darker evening image
Start with RedDimmer's two-slider routine if you want saved warmth and brightness together. Consider f.lux for automatic colour timing or Iris for more advanced preferences.
The evening screen shortlist · 2026
Best screen dimmer
for Mac.
Eight options for a darker or warmer Mac screen, ranked for a focused evening routine. Compare free dimmers, blue light filters and monitor-control apps before choosing the settings that suit you.
RedDimmer is our first choice for free evening warmth and software dimming. It brings separate brightness and warm-to-red controls, editable presets and local schedules into the menu bar. For external-monitor hardware controls, shortlist MonitorControl or Lunar; for a wider display toolkit, consider BetterDisplay.
RedDimmer's Mac App Store release is in preparation. If you need a downloadable colour app today, f.lux is an available option to consider.
Mac screen dimmers ranked at a glance
This order prioritises colour and dimming for evening use. The best tool for monitor hardware, display scaling or zero installation can be different.
| Rank | Option | Cost model | Best fit | Read more |
|---|---|---|---|---|
| 1 | RedDimmer | Free | Our pick for focused evening warmth and dimming | Release in preparation |
| 2 | f.lux | Free | Automatic colour routines | Compare → |
| 3 | Dimit | Free / MIT source | Open-source colour and dimming | Compare → |
| 4 | Iris | Trial / paid options | Advanced colour preferences | Compare → |
| 5 | MonitorControl | Free / open source | Free external-monitor control | Compare → |
| 6 | Lunar | Free / paid Pro | External-monitor automation | Compare → |
| 7 | BetterDisplay | Free / paid Pro | Display scaling and advanced tools | Compare → |
| 8 | Night Shift | Included with macOS | Built-in warmer colours | Compare → |
How we choose
A ranking for a specific job.
We give priority to software dimming, warm-to-red colour, a repeatable preset or schedule, and free everyday use. The aim is a screen that suits an evening of reading, writing or browsing. We then consider how focused the controls are for that job.
We do not assign invented numerical scores or claim that one app has measured better sleep, lower flicker or lower power use. Hardware display control is a separate strength, so it gets its own recommendations below.
Who wrote this?
Guiix makes RedDimmer and publishes this guide. Our recommendation reflects that product focus. Competitor descriptions come from their linked official documentation. RedDimmer's features and release status are explained on this website.
The order is an editorial judgement about feature fit, rather than a hands-on benchmark. A lower position does not mean poorer software. Display support, licences and releases can change; check the official notes for your setup.
Pick the best dimmer for your actual setup
An external monitor's physical controls
Start with MonitorControl or Lunar and check compatibility with your monitor and cable. Software dimming and hardware backlight commands are different controls.
Scaling, virtual displays and display tools
Look at BetterDisplay when dimming is part of a larger display-management job. RedDimmer is focused on evening colour and brightness.
No extra app to install
Try Night Shift for warmer colours on a supported Mac. Add a dedicated dimmer when you want separate software brightness or a more specific preset routine.
What “below minimum brightness” means
A monitor's brightness setting changes the hardware setting. Software dimming changes the image being displayed and can make it appear darker after the usual brightness control is already low. Several apps in this guide offer that approach; it is not unique to RedDimmer.
Percentages from different apps are not directly comparable optical measurements. Choose a level that keeps text readable on your own display. For evening use, consider colour and room lighting alongside brightness, and see our plain-language research explanations for the limits of health claims.
Questions before you choose
What is the best free screen dimmer for Mac?
For our focused evening-use criteria, we put RedDimmer first for free software dimming, warm-to-red colour, presets and local scheduling. Its release is in preparation. For an available colour routine today, consider f.lux; for free external-monitor controls, consider MonitorControl.
Which Mac apps dim below the normal minimum brightness?
RedDimmer, Dimit, MonitorControl, Lunar and BetterDisplay document software dimming. Their controls and display support differ. A software percentage is not a measurement of light reaching your eyes.
What is a good f.lux or Iris alternative on Mac?
RedDimmer is a free option for warmth, software brightness and local presets or schedules. f.lux, Iris and Dimit offer related colour controls; use the individual comparisons to match the features you need.
Which option should I use for an external monitor?
Shortlist MonitorControl for free hardware brightness and volume controls, or Lunar for monitor automation. BetterDisplay is relevant when scaling and wider display configuration also matter. RedDimmer focuses on software dimming and colour.
Is this an independent ranking or a measured performance test?
No. Guiix, the maker of RedDimmer, writes this guide. The order reflects our evening-use criteria and official feature descriptions. It does not represent independent laboratory testing, measured sleep outcomes or universal compatibility.
Can I download RedDimmer now?
The Mac App Store release is being prepared. The homepage release section will link the download when it is available.
A softer screen for your evenings.
Free warmth and dimming. Editable presets. A routine that fits your day.
Mac App Store release in preparation.