ASUS DisplayWidget Center vs ddcutil

ASUS DisplayWidget Center is free software for managing and adjusting compatible ASUS monitors on Windows and macOS. It lets users change display modes, brightness, contrast and colour temperature. Productivity tools include eye-care controls, MultiFrame window layouts, PIP/PBP, KVM controls and ZenScreen auto rotation. App Tweaker can apply presets or custom profiles to selected apps, and users can assign keyboard shortcuts to monitor settings. OLED Care includes pixel cleaning, uniform brightness and timer reminders, though feature availability varies by monitor. Gaming tools such as AI Visual and GamePlus are limited to specific monitor models or series. The AI Assistant accepts text or voice input to adjust settings and answer ASUS display product FAQs, but requires internet access and an account login; use may be limited to maintain service quality. Display CLI provides programmatic display control, while AI Agent Skills let compatible agents change settings using natural-language requests. Supported systems are Windows 11 or later and macOS 12 Monterey or later. The software works only with select ASUS monitors.

ddcutil is a free Linux program for controlling monitor settings such as brightness, color levels and input source. It communicates with monitors through DDC/CI over I²C and supports monitors implementing MCCS over USB. Commands can find monitors, show capabilities, read or change VCP feature values, and save or restore color-related settings. The companion ddcui provides a Qt graphical interface with Summary, Capabilities and Features views, with the last allowing changes to modifiable values. For profile workflows, dumpvcp saves current settings to a file and loadvcp restores them. Developers can use the C API through libddcutil.so to read and write VCP values and handle profile-related features. The program is released under GNU GPL version 2. Setup requires the Linux kernel i2c-dev module, and non-root users need permissions to run it. It does not support laptop displays, which use a special API rather than I²C, and generally will not run in virtual machines because virtual video drivers do not implement I²C. For MCCS-over-USB table features, support is limited; the capabilities command synthesizes a response.