What is codexmeter?

CodexMeter is a desktop app for Windows and macOS that shows how much of your Codex usage quota you have left. Codex is OpenAI's coding assistant, and its usage is capped on both a 5 hour rolling window and a 7 day window. Instead of checking those limits manually, CodexMeter connects through OAuth to read your usage numbers and displays them in a small window on your desktop, along with a countdown to when each limit resets. The app can also be pinned as a small always on top widget so the numbers stay visible while you work in other windows. All authorization data is stored locally on your machine rather than sent to any third party server, and the README is explicit that the app never sends chat content anywhere and never makes model requests of its own. It only reads the usage figures tied to your existing Codex login. Beyond the software version, there is an optional hardware companion built around an ESP32-C3 microcontroller with a small OLED screen. Once flashed through a web based tool, the tiny screen can show the same quota information, pushed to it over Bluetooth or over HTTP on a local network. This is meant for anyone who wants an at a glance physical readout rather than a window on their monitor. Under the hood, CodexMeter is built with Electron, Vue 3, and TypeScript, using Vite for the build, Naive UI for the interface, and electron-store for local data. The project separates its Electron main process, the code exposed safely to the interface, and the actual Vue pages into distinct folders, and it includes automated tests for both logic and UI sizing. The license is a custom non-commercial one: you may study the code, use the app for yourself, and build non-commercial variants of it, but commercial use is not allowed. The maintainer lists a roadmap covering more reliable auto updates, syncing with the hardware display, and support for more quota sources over time.