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A Simple Key Logger for MacOS

16 Nov 2021

In this post we’ll build a simple key logger for MacOS. I consists of two parts: a daemon (backend) and a UI (frontend). The daemon is basically a C++ binary that is always running on the background using launchctl. It intercepts key presses via MacOS’s APIs and logs a histogram in a plain text file. The UI is a Electron-based application that displays the file’s data using Plotly.

We’ll be primarily focusing on the backend. The objective of building this simple application is to learn about some MacOS APIs by creating a simple end-to-end application.

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