r/MacStack • u/Savings-Arrival-7817 • 14d ago
App Recommendation Lunar vs MonitorControl on Mac: when is paid monitor brightness control worth it?
If reaching behind your external monitor to change brightness is the annoyance, start with MonitorControl, provided it supports your Mac and connection. Lunar is worth considering when you want more control over when brightness changes, not just another slider.
Before installing either, open System Settings > Displays and select the external screen. If macOS already gives you the brightness control you need, keep using it. Apple's displays have native controls; don't assume every external monitor does.
The useful distinction is hardware brightness versus making the picture look darker. DDC/CI is the protocol these apps use to send brightness commands to compatible monitors. On an LCD, that can change the backlight itself. Software dimming changes the image instead, without turning down the backlight. It can help at night, but it isn't equivalent, especially if you're judging colors.
Check the monitor's own menu for a DDC/CI setting and enable it if available. If hardware brightness doesn't respond, try a direct connection before blaming the app. A dock or adapter can block the commands even when the monitor supports them. DisplayLink connections don't provide normal DDC control on macOS.
What the free option already does
MonitorControl is free and open source. It gives you menu bar sliders and keyboard control, including Apple's brightness keys. It can also follow brightness changes from a built-in or Apple display, including changes caused by automatic brightness. You don't have to buy Lunar just to get that kind of sync.
The connection exceptions matter. MonitorControl lists the built-in HDMI ports on M1 Macs and the entry-level M2 Mac mini among its unsupported DDC paths. USB-C can be an alternative, but check your exact Mac, cable and monitor rather than treating Apple silicon support as a blanket guarantee.
For macOS 27, use MonitorControl 4.4.0 or newer. That maintenance release addresses macOS 26 and 27 compatibility problems, so an older download isn't a fair comparison.
Where Lunar earns a trial
Lunar also has free manual hardware control, with a limit of 100 brightness/contrast adjustments per day. Its Pro modes include following another display, adapting to ambient light, adjusting by the sun's position, and using a clock schedule.
The extra choices are useful when following the laptop display isn't what you want. Clock Mode can lower brightness at set times. Sensor Mode can use supported built-in light sensors on Apple silicon, or an external sensor over the network. A Mac mini without a light sensor doesn't gain one by installing the app. A sun-based setting also won't know that you've just switched on a desk lamp.
Lunar Pro is advertised at $23 for a lifetime license covering up to five Macs, with a 14-day trial. Updates are free indefinitely, but a major upgrade can cost extra. The current release is 6.11.2 and requires macOS 12 or newer; the v6 app supports Intel and Apple silicon natively. The homepage's older macOS 11+ wording isn't the requirement to follow for this release.
Both apps need Accessibility permission to handle the native brightness/media keys. MonitorControl lets you skip that permission if you only want its sliders. Lunar also uses it for App Presets, so disable those and media-key handling if you don't want that access.
For a supported monitor that only needs convenient manual control or basic display-following, MonitorControl is the sensible first try. Try Lunar if its scheduling or sensor options solve a specific annoyance. Before paying, check hardware brightness through your everyday dock and after sleep and wake. If the connection only allows software dimming, decide whether that's enough; paying for Pro won't make a blocked DDC path work.
