ddcctl vs ExtLume
ddcctl
github.comExtLume
github.comSide by side
| Figure | ddcctl | ExtLume |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Windows | — | Yes |
| macOS | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Monitor Control Software | 7.5 (#12) | 7.4 (#15) |
| Purpose | ddcctl adjusts external monitors’ built-in controls from the macOS shell. | ExtLume is a Windows tray app for adjusting external monitor brightness when Windows provides a brightness slider only for the laptop panel. |
| 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. | The maker directs users to GitHub Issues for general troubleshooting and recommends including app, Windows, laptop or GPU, monitor, connection path, control mode, and expected-versus-actual result in compatibility reports. |
Plans
In their own words
ddcctl
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.
ExtLume
ExtLume is a Windows tray app for adjusting external-monitor brightness when Windows provides a brightness control only for the laptop panel. It offers a separate slider for each safely identified active external display and shows its EDID model name. When the monitor and the full cable or dock chain support DDC/CI, the app changes the physical backlight. If that is unavailable, it can use a click-through dimming overlay on a safely isolated external desktop area; this changes the image but not backlight power. ExtLume handles multiple displays, mirrored groups, hot-plugging, and resume, while excluding built-in panels and virtual displays. It targets Windows 10 and Windows 11 and requires .NET Framework 4.8. The free, MIT-licensed public beta is available from GitHub Releases as a per-user installer or portable ZIP and requires no administrator rights. ExtLume says it works offline without telemetry or network requests. It stores limited local monitor and dimming data, and its controls are limited to brightness rather than arbitrary VCP commands, resets, or automatic display substitution.