Claude Usage Monitor

Claude Usage Monitor shows your Claude.ai plan usage directly in the browser toolbar — no need to keep a tab open. What you see at a glance: Session usage % in the badge (color-coded: green / blue / amber / red) Session start time, estimated end time, and remaining time Weekly (7-day) usage %, with the exact day and time it resets The signed-in Claude account (email) so you always know which session is being read A clear sign-in prompt when no Claude session is detected Tooltip on hover with full details How it works: The extension calls the Claude API directly using your existing browser session — the same API that powers the claude.ai/settings/usage page. Data refreshes automatically about every 15 seconds while your browser is active. The extension never reads or injects code into any web page. No third-party servers, no tracking, no accounts. Privacy: All data is stored locally in your browser. Nothing is sent to external servers. The extension does not read the content of any page you visit. See the full privacy policy linked below. Permissions explained: storage – saves the last reading and a local diagnostics log between sessions alarms – keeps the service worker awake to poll usage (~15s cadence) claude.ai host permission – required to call the Claude usage API with your session