ddcctl vs MonitorControl

ddcctl is a free GPLv3 open-source command-line utility for adjusting external monitor controls from the macOS shell. Its primary controls are brightness and contrast. Depending on monitor firmware, it may also switch input source, change built-in speaker volume or RGB colors, select color presets, and reset settings. The stated scope is macOS, Macintosh hardware, and DDC-controlled monitors. Installation is available through Homebrew, downloadable release binaries, or a source build; building requires Xcode and running make. Example scripts can be invoked by Alfred, ControlPlane, or Karabiner to switch presets. The project describes itself as a personal utility in maintenance mode and asks users to debug their own issues. Its maker says there is no time to triage new issues or support non-bugs, and no support or discussion forum is planned. Verification is manual, with no CI connected to real Macs and monitors. The releases page lists v1 as the latest release. The listed controls include DDC/CI, input switching, and command-line access.

MonitorControl is a free macOS app for controlling external display brightness, volume, and contrast while showing native macOS on-screen displays. It supports DDC on external monitors, Apple protocols on Apple and built-in displays, gamma-table dimming, and shade control for AirPlay, Sidecar, DisplayLink, and other virtual screens. Brightness can transition smoothly or dim to full black. Standard Apple brightness and media keys work, and custom shortcuts are available. Multiple displays can be synchronized with one slider or shortcuts, including copying brightness changes from built-in or Apple displays to non-Apple screens. Dozens of customization options are provided, with more under “Show advanced settings.” MonitorControl is free, with no trial, and runs on macOS. Version 4.0.0 lists Catalina 10.15 as its baseline; full functionality is available on macOS 11 Big Sur or newer. The latest listed release is v4.4.0.