Privacy Policy

Effective date: 2026-04-14 · Extension version: 0.1.0

Introduction

KeenSense is a browser extension that tracks product prices across retail websites. It is developed and maintained by fokko as a personal project. This privacy policy explains what data KeenSense accesses, how it is stored, and what network requests it makes.

KeenSense is local-first: all data stays on your device. The developer does not operate any servers and does not receive any user data.

Limited Use of User Data

KeenSense's use of user data complies with the Chrome Web Store User Data Policy, including the Limited Use requirements.

KeenSense does not collect, transmit, store, sell, or share user data with any third party (apart from the user-initiated, user-keyed OpenAI fallback described below, and the retailer websites the user explicitly asks KeenSense to track). There is no developer-operated server of any kind.

What Data We Collect

Stored locally on your device:

• Product URLs, names, and images you choose to track
• Price history (current and historical prices, timestamps)
• Check logs (extraction method used, success/failure, timing data)
• Store profiles (domain, detected platform, technical profile)
• Your extension settings and preferences

Transient data (not persisted):

• Page HTML fetched during price re-checks (discarded after extraction)
• DOM content accessed by the content script on the active tab (used only for price detection)

How Data Is Collected

• Content script: When you click "Track Price", a content script is injected into the active tab to detect the product price using structured data (JSON-LD, Open Graph, Microdata) or a visual element picker
• Background HTTP fetches: During scheduled price re-checks, the extension fetches product pages via HTTP to extract updated prices
• Background tabs: For sites that require JavaScript to display prices, KeenSense may briefly open a background (non-active) tab to load the page, extract the price, then close the tab automatically. These tabs may appear in your tab bar for a few seconds and are limited to the URLs of products you have explicitly added
• User action: All tracking is initiated explicitly by the user — KeenSense never automatically tracks pages you visit

Local Storage

All data is stored in chrome.storage.local (or the Firefox equivalent). Data never leaves your device through any mechanism controlled by the developer. There is no server, no analytics, no telemetry.

Price Re-Checks

KeenSense periodically sends HTTP requests directly from your browser to the retailer websites whose products you are tracking. These are the same sites you already visit. The retailer sees ordinary web request metadata (your IP address, User-Agent string) — the same information they see when you visit their site normally.

On-Device AI

KeenSense can optionally use Chrome's built-in AI APIs (Gemini Nano) for price extraction when traditional methods fail. This processing runs entirely on your device. No data is sent to Google or any other service through this feature.

External LLM (Optional)

If you choose to configure an OpenAI API key in Settings, KeenSense will send small HTML fragments from product pages to OpenAI's API (api.openai.com) using your key when other extraction methods fail. This feature is:

• Off by default — you must explicitly enable it and provide your own API key
• User-initiated — the developer does not receive this data and has no access to your API key
• Limited in scope — only small page fragments relevant to price extraction are sent, not full page content

The developer is not responsible for how OpenAI processes data sent via your API key. Refer to OpenAI's privacy policy for details.

Third-Party Sharing

The developer does not sell or rent user data, and does not share it with third parties except as described above (the user-initiated, user-keyed OpenAI fallback, and the retailer websites the user explicitly asks KeenSense to track). The developer does not have access to any user data.

Data Retention

Your data is stored locally until you take one of these actions:

• Remove a tracked product (deletes that product's data)
• Clear extension storage via browser settings
• Uninstall the extension (removes all extension data)

There is no remote data to delete because no data is ever transmitted to the developer.

User Rights (GDPR)

Because all data is stored locally on your device, you have full control:

• Access: View all your data in the Dashboard (Products, Stores, Logs tabs)
• Deletion: Remove individual products, clear check logs, or uninstall the extension
• Portability: Your data is in chrome.storage.local and can be exported via browser developer tools
• Rectification: Edit tracked products directly in the Dashboard

Legal basis for processing: Contract performance — you explicitly request price tracking by clicking "Track Price" for each product.

Children's Privacy

KeenSense is not directed at children under 13 and does not knowingly collect personal information from children. If you believe a child has provided personal data through this extension, please contact us.

California Privacy Rights

KeenSense does not sell personal information. Because all data is stored locally on your device, there is no personal information held by the developer that could be sold, disclosed, or shared with third parties.

Security

Your data is stored locally in the browser's extension storage, which is sandboxed and protected by the operating system and browser security model. The developer does not have access to your data. For security concerns, see SECURITY.md.

Changes to This Policy

If this policy is updated, the effective date and extension version at the top of this document will be changed. Significant changes will be noted in the extension's release notes.

Contact

For privacy-related questions or concerns:
Email: fokko@mail.com