Privacy Policy

Token Watcher Chrome Extension · Last updated: June 10, 2026

      Short version: Token Watcher only reads token counts from AI API responses in your browser. It never reads your conversation content, never sends any data to external servers, and stores everything locally on your device.
    

1. What is Token Watcher?

Token Watcher is a Chrome browser extension that intercepts API responses from Claude.ai and ChatGPT to extract token usage metadata (input tokens, output tokens, cache tokens) and calculate the associated cost. All processing happens locally in your browser.

2. Data We Collect

Token Watcher collects only the following fields from AI API responses:

Field	Source	Purpose
Input token count	API response metadata	Cost calculation
Output token count	API response metadata	Cost calculation
Cache write / read token count	API response metadata	Cost calculation
Model name	API response metadata	Per-model cost breakdown
Timestamp	Generated locally	Daily trend chart
Site hostname	Current tab URL	Distinguish Claude vs ChatGPT

We do not collect:

Conversation content, prompts, or AI responses
Your name, email address, or any personal identifiers
Browsing history or URLs beyond the hostname of supported AI sites
Browser cookies, passwords, or authentication tokens

3. How Data is Stored

All data is stored locally on your device using the browser's built-in chrome.storage.local API. Data is automatically pruned after the retention window (7 days for the free plan, 30 days for Pro). No data is ever written to a database or file server.

4. Data Sharing

Token Watcher does not share, sell, transmit, or otherwise disclose any collected data to third parties.

The only outbound network request made by the extension is the Gumroad license verification call (api.gumroad.com/v2/licenses/verify) when a user manually activates a Pro license key. This request contains only the license key and the product ID — no token data is included.

5. Permissions Explained

Permission	Why it is needed
`storage`	Store token usage records and settings locally in the browser.
`alarms`	Schedule a daily background task to prune old records beyond the retention window.
`notifications`	Send an optional alert when daily cost exceeds a user-configured threshold.
`tabs`	Open the options / report page when the user clicks "Full Report" or "Settings" in the popup.
Host permissions (claude.ai, chatgpt.com, api.anthropic.com)	Inject content scripts that intercept fetch responses to extract token count metadata from SSE streams.

6. Children's Privacy

Token Watcher is a developer tool not directed at children under 13. We do not knowingly collect any information from children.

7. Changes to This Policy

If this policy is updated, the "Last updated" date at the top of this page will be revised. Continued use of the extension after any changes constitutes acceptance of the updated policy.

8. Contact

Questions or concerns about this privacy policy can be sent to: can995835646@gmail.com