Free Alternative to Lunar Pro

This is the app I install first on any new Mac. MonitorControl does exactly what Lunar's basic tier used to do. It maps your Mac keyboard brightness and volume keys to your external monitor. I tested version 4.1.0 on Sonoma. It feels like a native Apple utility. The integration is completely invisible once you set it up. You get the standard Apple OSD popups when you adjust levels. The developers built it specifically for Apple Silicon and Intel Macs. It uses the exact same DDC protocol as Lunar. I did notice the sync mode lags behind the built-in screen by about two seconds. That minor delay is easy to ignore since the core functionality is perfectly stable.

Waydabber created this tool to fix Apple's messy external display scaling. The app has a paid Pro tier. The free version handles basic DDC brightness and software dimming perfectly. I ran version 2.3.x during my tests. The sheer amount of control is staggering. You can override EDID data to force HiDPI resolutions on stubborn 1440p monitors. The brightness slider lives in your menu bar. The interface is frankly overwhelming. You open the settings and face a wall of checkboxes. It took me ten minutes just to find the basic DDC toggle. It is total overkill if you only want to dim your screen. The free tier will occasionally show you a prompt for the Pro version.

Graphical apps are nice. Sometimes you just want to script your desk setup. Waydabber built m1ddc to send raw DDC commands directly through Apple Silicon display pipelines. I tested version 1.1.0 using iTerm2. The execution speed is instant. You type a command to set luminance to 50 percent. The monitor reacts before your finger leaves the return key. I used this to build a Hammerspoon script. It automatically dims my monitor when I open Xcode. There is absolutely no graphical interface. You have to know your way around a terminal. It only works on M-series Macs.

This is the older sibling to m1ddc. It was built back when Intel Macs dominated the market. I fired up an old 2019 MacBook Pro to test it. The tool reads and writes I2C commands directly to the monitor EEPROM. It handles brightness and contrast adjustments well. The input switching feature is very handy for dual computer setups. The execution is slightly slower than modern Apple Silicon tools. I noticed a half-second delay on my Dell display. The project has not seen a major update in a few years. It still compiles and runs fine on macOS Ventura and Sonoma.

Some monitors simply refuse DDC commands. DisplayLink docks are notorious for blocking the protocol entirely. When hardware control fails, you need software dimming. Brightness Slider is a tiny Mac App Store utility. It does not actually lower your monitor backlight. It simply draws a transparent black overlay across your screen. I tested version 1.2.2. It sits quietly in the menu bar. You drag the slider down. The screen gets darker. The massive downside is what it does to your image quality. Pure blacks turn into muddy grays. Your monitor backlight is still running at 100 percent. It saves zero electricity. It completely destroys your contrast ratio. It is a brute force solution.

Everyone knows F.lux for its color temperature scheduling. It shifts your screen to a warm orange at night. Many people ignore its built-in software dimming feature. You can press Option and PageDown on your keyboard. The app applies a software dimming layer over your entire display. I have used F.lux for years. The dimming feature is incredibly helpful during late-night writing sessions. The interface looks like it was designed in 2012. It has not changed in a decade. It suffers from the same contrast issues as Brightness Slider. The software overlay washes out your colors. The combination of warm color shifting and dimming is very easy on the eyes.

You do not actually have to pay for Lunar Pro. The developer offers a basic free tier. I uninstalled my Pro license to test the restrictions. The free version retains basic DDC control. You can use your keyboard keys to adjust brightness and volume. You lose access to Sync mode. You cannot use the ambient light sensor features. The XDR brightness unlock is disabled. The app frequently reminds you to upgrade. The settings menu displays grayed-out Pro features everywhere you look. It is a solid option if you already have it installed. I find the constant upsells annoying when completely free alternatives exist.

Lumen takes a completely different approach to display management. It does not use DDC. It does not rely on ambient light sensors. It constantly analyzes the contents of your screen. If you open a dark terminal window, Lumen lowers the brightness. If you open a blinding white web page, it turns the brightness up. I compiled it from source to test it. The effect is actually quite pleasant once you get used to it. It mimics the TrueTone experience on cheap monitors. The problem is the CPU usage. Analyzing screen pixels constantly takes processing power. I noticed a 5 percent CPU spike every time I switched applications. The original developer has not updated the repository in years.