UltraCat

UltraCat is a small macOS utility that lives in the menu bar, the strip of icons in the top-right corner of the screen on a Mac. From there it lets you monitor your system status, adjust fan speeds, and manage sleep settings, all without opening a separate app window.

This GitHub repository does not contain source code. The author uses it as a distribution point and update delivery channel. The actual application is a compiled macOS app available as a DMG file from the releases section. To install it, you download the DMG, open it, and drag the app into your Applications folder.

Fan control and some power management features require an extra permission step. The first time you use those features, macOS will ask you to approve a background helper component in System Settings. After granting that permission, you quit and reopen the app for it to take effect.

UltraCat checks for updates automatically using a tool called Sparkle, which is a standard update framework for macOS applications. The app supports both Korean and English interfaces. According to the README, it requires macOS 26.4 or later.

The README is short and does not describe which specific system metrics are shown, what fan speed options are available, or what the sleep management controls include beyond confirming those features exist. Screenshots are included in the README but the description of what each panel does is left to the images.