Hidden Bar vs Ice

Hidden Bar is a free, open-source macOS app for hiding menu bar items. Click its arrow to expand or collapse the hidden section, and Command-drag icons across the divider to choose which items it hides. Preferences include automatic re-collapse after a selected delay and a system-wide shortcut. An optional second section stays hidden even when the main section is expanded; Option-click the arrow to reveal it. The app can launch at login through the macOS 13 or later SMAppService login item. It is available through Homebrew or manual download, and the project describes its direct download as notarized. The listed plan is free. On macOS 27, the direct download requires Accessibility permission to detect icon positions; hiding is per app, built-in macOS items remain visible, and the app must run from /Applications. That hiding feature relies on a private Apple framework that a macOS update could disrupt.

Ice has no write-up on Specifiction yet; its figures are above.