Delta V — Development skill for Claude Code

Delta-V

See how much Claude Code and Codex usage you have left, from your Mac's menu bar. View either provider or both side by side, and choose which usage window appears beside `ΔV`.

The name comes from spaceflight: a finite budget until the next refill.

Install

Delta-V is still in development. There is no downloadable app or Homebrew package yet. For now, you need to build it from source on a Mac.

You need [Node.js](https://nodejs.org/en/download) 22.12 or newer, [Rust](https://rust-lang.org/tools/install/), and the [Xcode command line tools](https://developer.apple.com/documentation/xcode/installing-the-command-line-tools) installed.

1. Download the source from this repository using Code → Download ZIP, then unzip it.
2. Open Terminal. Type cd , including the space, then drag the extracted folder into Terminal and press Return. Use the folder containing package.json.
3. Run these commands, one at a time:

npm ci
npm run tauri -- build -- --locked
./src-tauri/target/release/delta-v

The first two commands build the app. The last command opens Delta-V. Look for **ΔV in the menu bar at the top of your screen**, near the clock. It does not open a regular window or appear in the Dock.

Keep that Terminal window open while using this source build. To quit, click ΔV, then **Quit**. To open it again, run the last command from the same folder; you only need to rebuild after changing or updating the source.

Connect your accounts

You can use Claude, Codex, or both. You only need an account for the provider you want to see.

Delta-V reads the sign-in saved by each provider's terminal app, also called a CLI. If you already use those tools on this Mac, you may already be signed in.

Provider	Account needed	How to sign in
Claude	A Claude account with a subscription that includes Claude Co