Why You Need a Monitor Control App on Mac
If you use an external monitor with your Mac, you have probably noticed a frustrating gap in macOS: there is no built-in way to adjust the brightness, volume, or color settings of a non-Apple display. The keyboard brightness keys work great for your MacBook screen or an Apple Studio Display, but plug in a Dell, LG, Samsung, or ASUS monitor and those keys do nothing.
This means you are stuck reaching for the physical buttons on the back or underside of your monitor every time you want to change the brightness. If you run a multi-monitor setup, keeping brightness levels consistent across screens becomes a tedious chore. And if you want to switch inputs without pulling up the monitor's clunky OSD menu, you are out of luck.
A dedicated monitor control app solves all of these problems. These apps use a protocol called DDC/CI (Display Data Channel / Command Interface) to communicate directly with your monitor's hardware over the same cable that carries your video signal. That means real, hardware-level brightness adjustments, not a software overlay dimming your picture. The result is the same as pressing the physical buttons, but controlled entirely from your Mac.
In this guide, we compare the five best macOS apps for controlling external monitors in 2025. We will look at their features, ease of use, compatibility with Apple Silicon, and pricing to help you find the right fit for your workflow.
What to Look For in a Monitor Control App
Before diving into individual apps, here are the key criteria we used to evaluate each one:
- DDC/CI Support -- The app should communicate with your monitor at the hardware level, not just overlay a software dimming filter. True DDC/CI control adjusts the actual backlight.
- Feature Set -- Beyond basic brightness, does it support volume control, input switching, color temperature adjustment, presets, or brightness sync across displays?
- User Interface -- A clean, native-feeling UI matters. You will interact with this app multiple times a day. It should be fast, intuitive, and stay out of your way.
- Apple Silicon Native -- Running natively on M1, M2, M3, and M4 Macs ensures better performance and battery life compared to Rosetta-translated apps.
- Lightweight -- A monitor control app should not hog memory or CPU. It should sit quietly in the menu bar and respond instantly when you need it.
- Price -- Some apps are free and open source, others charge a one-time fee or subscription. We will call out the pricing model for each.
With those criteria in mind, let us look at the top contenders.
1. Lumino Editor's Pick
Lumino
Free + Pro at ฿350 (~$10)Lumino is a modern, native macOS menu bar app built specifically for controlling external monitors over DDC/CI. It is written entirely in Swift, runs natively on Apple Silicon, and feels like a natural extension of macOS. When you click the menu bar icon, you get a clean panel showing all connected displays with sliders for brightness, volume, and color temperature -- no clutter, no learning curve.
What sets Lumino apart is the combination of polish and power. The free tier covers basic brightness and volume control for most users, while the Pro upgrade unlocks advanced features like input source switching, brightness sync across all displays, custom presets, and global keyboard shortcuts. The input switching feature is particularly useful if you share a monitor between a Mac and a PC -- one shortcut and you are on a different input, no OSD menu required.
Brightness sync is another standout: when you adjust your MacBook display brightness (or when it adjusts automatically with ambient light), Lumino matches your external monitors in real time. This keeps your entire workspace visually consistent without any manual effort. Presets let you save different configurations for day and night, or for different tasks like photo editing and coding.
The app is impressively lightweight, typically using less than 20 MB of RAM, and it responds to DDC/CI commands almost instantly. Setup is effortless -- install it, and it detects your monitors automatically.
Pros
- Clean, native macOS UI
- DDC/CI brightness, volume, color temp
- Input source switching
- Brightness sync across displays
- Custom presets and keyboard shortcuts
- Native Apple Silicon (M1-M4)
- Very lightweight (~20 MB RAM)
- Generous free tier
Cons
- Pro features require one-time purchase
- Newer app, smaller community
- No Linux or Windows version
2. MonitorControl
MonitorControl
Free (Open Source)MonitorControl is a well-known, open-source option that has been around for several years. It maps your Mac's keyboard brightness and volume keys to work with external monitors over DDC/CI, which is a straightforward and practical solution. If all you need is basic brightness and volume control using your existing keyboard keys, MonitorControl gets the job done for free.
The app places sliders in the menu bar for adjusting brightness, contrast, and volume on each connected display. It supports Apple Silicon natively and has a decent-sized community contributing to its development on GitHub.
However, MonitorControl's simplicity is also its limitation. There is no input switching, no brightness sync between displays, no color temperature control, and no presets. The UI, while functional, feels utilitarian compared to more polished alternatives. Some users have reported occasional issues with DDC/CI reliability on certain monitor and adapter combinations, and troubleshooting can require digging through GitHub issues.
Pros
- Completely free and open source
- Keyboard brightness/volume key support
- DDC/CI brightness and volume
- Apple Silicon native
- Active open-source community
Cons
- No input switching
- No brightness sync
- No color temperature control
- No presets or profiles
- Utilitarian UI
3. Lunar
Lunar
$23 (One-time)Lunar is a feature-rich monitor control app that combines DDC/CI hardware control with software-based dimming as a fallback. Its headline feature is adaptive brightness using your Mac's ambient light sensor -- the app reads the sensor data and adjusts your external monitors accordingly, similar to how Apple's True Tone works for built-in displays.
Beyond adaptive brightness, Lunar offers sub-zero dimming (making the screen darker than the monitor's minimum using a software overlay), custom hotkeys, sunrise/sunset-based scheduling, and an XDR brightness mode for HDR-capable displays. It also supports DDC/CI volume control and basic input switching on some monitors.
The trade-off is complexity. Lunar has a lot of settings, and the UI can feel overwhelming for users who just want simple brightness control. The app uses multiple brightness adjustment modes (DDC, Gamma, Sensor, Clock, Manual) and understanding when each applies takes some reading. At $23, it is one of the pricier options, though it is a one-time purchase. Some users report that the software dimming layer can introduce a slight color shift compared to pure DDC/CI control.
Pros
- Adaptive brightness via ambient sensor
- DDC/CI + software dimming fallback
- Sub-zero dimming for dark rooms
- Sunrise/sunset scheduling
- Lots of customization
Cons
- Complex UI and settings
- $23 price tag
- Software dimming can shift colors
- Heavier resource usage
- Steep learning curve
4. BetterDisplay
BetterDisplay
Free + Pro at $18BetterDisplay (formerly BetterDummy) takes a broader approach to display management on macOS. Rather than focusing solely on DDC/CI monitor control, it offers a wide range of display-related features: creating virtual dummy displays for headless Macs, enabling HiDPI (Retina) resolutions on non-Retina monitors, custom resolution management, display mirroring configurations, and PIP (picture-in-picture).
DDC/CI brightness and volume control is included, so you can adjust your external monitor's settings. However, display control is just one piece of a much larger puzzle. The interface reflects this -- there are numerous menus, toggles, and options that cater to advanced display management scenarios. For power users who need to wrangle dummy displays for streaming or force HiDPI on a 1440p monitor, BetterDisplay is invaluable.
For users who simply want to control brightness and volume on their external monitor, BetterDisplay can feel like overkill. The sheer number of options makes it less approachable for everyday use, and you might find yourself navigating through features you do not need. The free version has limitations, and the Pro unlock is $18.
Pros
- DDC/CI brightness and volume
- Dummy displays and HiDPI support
- Comprehensive display management
- Custom resolutions and PIP
- Apple Silicon native
Cons
- Overly complex for basic monitor control
- No brightness sync
- No color temperature control
- UI can be overwhelming
- Pro features at $18
5. NativeDisplayBrightness
NativeDisplayBrightness
Free (Open Source)NativeDisplayBrightness is about as simple as it gets. This lightweight, open-source utility does exactly one thing: it makes your Mac's keyboard brightness keys work with external monitors over DDC/CI. There is no menu bar interface, no sliders, no settings panel to speak of. You install it, and your brightness keys now control your external display. That is it.
For some users, this minimalism is exactly right. If your only frustration is that the brightness keys do not work with your external monitor and you do not need anything else, NativeDisplayBrightness solves that problem with zero overhead. It runs silently in the background and uses virtually no system resources.
The downside is that it offers nothing beyond keyboard brightness control. There is no volume control, no input switching, no color temperature adjustment, no multi-monitor management, and no visual interface for fine-tuning. Development has also slowed considerably, and compatibility with the latest macOS versions is not always guaranteed.
Pros
- Extremely simple and lightweight
- Free and open source
- Keyboard brightness keys just work
- Near-zero resource usage
Cons
- Brightness only -- no volume or other controls
- No graphical interface
- No multi-monitor features
- Development has slowed
- May not support latest macOS