FnKeyboard

FnKeyboard is a macOS menu‑bar utility that places the full set of function keys (F1–F12) in a pop‑over accessible from the status bar. Clicking a displayed keycap sends the corresponding system action—such as adjusting brightness, volume, or media playback—through HID and CGEvent APIs, while the app also monitors physical F‑key presses when granted Accessibility permission.

The tool is built with Swift 5.9, runs on macOS 13.0 Ventura or later, and adapts its appearance to dark and light modes. It offers animated hover highlights, uses SF Symbols for key icons, and operates without a Dock presence. The application is open‑source, MIT‑licensed, and distributed as a pre‑built app or source code that can be compiled with Xcode command‑line tools.

Security‑focused design includes a hardened runtime, code signing, rate limiting, and memory‑safe event handling, though it runs unsandboxed to access the required Accessibility and Input Monitoring privileges. The project is stable and intended for users who need quick, mouse‑driven access to macOS function‑key actions.