Side by side

ddcctl vs ExtLume

Both stand on monitor control software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

ddcctl

Free plan Mac

ddcctl offers command-line monitor controls for macOS, with additional functions dependent on monitor firmware. Its maintenance status and limited support make it a better fit for users comfortable handling their own troubleshooting.

Visit ddcctl

ExtLume

Free plan Windows

ExtLume focuses on external-display brightness, with hardware control when the full connection supports DDC/CI and a software alternative in some cases. Its brightness-only scope and beta status are worth noting.

Visit ExtLume

The facts

	ddcctl	ExtLume
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	Mac	Windows
Lowest paid plan	Free or on request	Free or on request
Plans published	1	1
Maker	Not published	Not published
Website	github.com	github.com
On monitor control software	#8 of 24	#12 of 24

ddcctl: what it does well

Free and GPLv3 open source.
Controls brightness and contrast.
May switch inputs, depending on monitor firmware.
Offers Homebrew and binary installation options.
Example scripts can work with Alfred, ControlPlane, or Karabiner.

What to know first

Project is in maintenance mode.
Maker does not offer support for non-bugs.
Source build requires Xcode and make.
Verification is manual, with no connected CI system.

ExtLume: what it does well

Separate slider for each safely identified active external display.
Controls physical backlight through supported DDC/CI connections.
Handles mirrored displays, hot-plugging, and resume.
Per-user installer and portable ZIP options.

What to know first

Requires Windows 10 or 11 and .NET Framework 4.8.
Software dimming does not reduce backlight power.
No input switching, monitor profiles, or scheduling.
Public releases are beta builds.

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