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ddcctl
What it is
ddcctl is a free, open-source command-line utility for adjusting external monitor controls from the macOS shell. Its main controls are brightness and contrast. Depending on a monitor’s firmware, it may also switch input source, adjust built-in speaker volume or RGB colors, select color presets, and reset settings. The project’s stated scope is macOS, Macintosh hardware, and DDC-controlled monitors. Installation options include Homebrew, downloadable release binaries, or building from source; building requires Xcode and running make. Example scripts can be invoked by Alfred, ControlPlane, or Karabiner to switch presets. The maker describes the utility as personal software in maintenance mode, and says users should debug their own issues. They also say they do not have time to triage new issues or support non-bugs, and do not plan to moderate a support or discussion forum. Verification is manual, with no CI connected to real Macs and monitors. The releases page lists v1 as the latest release.
For and against
For
- Controls monitor brightness and contrast.
- May switch inputs, depending on monitor firmware.
- Install through Homebrew or a release binary.
- GPLv3 open source.
Against
- Monitor controls depend on firmware.
- The project is in maintenance mode.
- The maker does not offer general issue support.
- Verification is manual, without connected-device CI.
The verdict
ddcctl offers command-line monitor controls for its stated macOS and DDC monitor scope. Its maintenance status and limited support are important considerations.
Who it suits
It suits macOS users who want command-line control of DDC-compatible external monitors. Users should be prepared to troubleshoot their own issues.
Plans and prices
ddcctl
GPLv3 open source · command-line utility
Read 7 Oct 2026 · github.com
On the record
- Brightness and contrast
- It controls monitor brightness and contrast.github.com · read 7 Oct 2026
- Build requirement
- Building from source requires Xcode and running make.github.com · read 7 Oct 2026
- Installation
- The README gives Homebrew, downloadable release binaries, and build-from-source as installation options.github.com · read 7 Oct 2026
- Integrations
- The README says Alfred, ControlPlane, or Karabiner can invoke its example script to switch presets.github.com · read 7 Oct 2026
- License
- The repository identifies the project as GPLv3 open source.github.com · read 7 Oct 2026
- Maintenance
- The project describes itself as the maker’s personal utility and says it is in maintenance mode.github.com · read 7 Oct 2026
- Monitor compatibility
- The maker’s stated scope is macOS, Macintosh hardware, and DDC-controlled monitors, and says users should debug their own issues.github.com · read 7 Oct 2026
- Other controls
- Depending on monitor firmware, it may control input source, built-in speaker volume, RGB colors, color presets, and reset.github.com · read 7 Oct 2026
- Purpose
- ddcctl adjusts external monitors’ built-in controls from the macOS shell.github.com · read 7 Oct 2026
- Release
- The releases page lists v1 as the latest release and describes it as the v1 release of ddcctl.github.com · read 7 Oct 2026
- Support
- The maker says they do not have time to triage new issues or provide support for non-bugs, and do not intend to moderate a support or discussion forum.github.com · read 7 Oct 2026
- Testing
- The maker says verification is manual and there is no CI system connected to real Macs and monitors.github.com · read 7 Oct 2026
