Privacy Policy

Claude Usage Monitor Chrome Extension · Last updated May 2026 · Author: Trace Cohen

TL;DR

This extension collects nothing. All data stays in your browser. No servers, no tracking, no ads, no account required.

What data does the extension access?

Claude Usage Monitor reads your Claude.ai usage percentages (e.g. "72% used") and reset times from the claude.ai/settings/usage page that you have already opened in your browser. It reads these values by observing the page you're already viewing — the same way you would read them yourself.

Where does that data go?

Nowhere outside your device. All usage data is stored exclusively in chrome.storage.local — a sandboxed, browser-local store that only this extension can read. It is never:

✓Uploaded to any server
✓Sent to the extension developer
✓Shared with third parties
✓Used for analytics or advertising

Permissions and why they're needed

storage

Saves your usage history and preferences locally in the browser. Data never leaves your device.

notifications

Shows desktop alerts when you approach a usage threshold you configured.

alarms

Schedules periodic background checks every 5–20 minutes to keep usage data current.

tabs

Opens a silent background tab to refresh usage data and broadcasts live updates to open Claude.ai tabs. No browsing history is read or stored.

offscreen

Plays an optional audio alert via Web Audio API. The document closes immediately after the sound. No audio is recorded.

host: claude.ai

Required to read usage percentages from your settings page and display the in-page warning banner.

host: localhost:39571

Optional. Only used if you install the companion menu bar server, which runs entirely on your local machine.

Optional local server (menu bar support)

If you choose to install the optional local Python server for SwiftBar/xbar menu bar support, data is sent over localhost (127.0.0.1:39571) only — it never leaves your machine. This component is entirely optional and is not installed by default.

No accounts, no sign-in

The extension requires no account, no login, and no personal information of any kind. It works entirely offline after installation.

Open source

The full source code is publicly available at github.com/tracecohen/claude-usage-monitor. You can audit exactly what the extension does.

Contact

Built by Trace Cohen. Questions or concerns: t@nyvp.com