Claude Usage Tracker

About

A Chrome extension that tracks your token usage across Claude Chat, Projects, Cowork, and Design in real time — with desktop alerts before you run low and full trend analytics.

> **Independent open-source project. Not affiliated with Anthropic.**

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## Features

- **Live badge** on the toolbar icon showing today's usage as % of your daily average
- **Desktop notifications** at configurable thresholds (default 50 🟢 / 75 🟡 / 90 🔴)
- **Popup** with today's gauge, per-product breakdown, and one-click dashboard access
- **Full dashboard** with daily bars, weekly bars, time-of-day heatmap, and product donut chart
- **Product filter** — track only the Claude surfaces you care about
- **CSV export** for your own analysis
- All data stored **locally** — nothing leaves your browser

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## How it works

The extension intercepts `fetch` calls on `claude.ai` and reads the `input_tokens` / `output_tokens` fields from Anthropic's streaming SSE responses. Message content is never read or stored. Since Anthropic does not expose a public quota API, usage is tracked **relative to your own rolling average** rather than against an absolute limit.