Privacy Policy

Last updated: April 2026

⚡ Short version: ProfLens does not collect, store, transmit, or share any personal data. Ever.

What ProfLens does

ProfLens is a Chrome extension that overlays RateMyProfessors ratings directly onto your course registration page. When you hover over a professor's name, it shows their rating, difficulty score, would-retake percentage, and review count — without you ever leaving the page.

Data we do NOT collect

ProfLens does not collect, transmit, sell, or share any of the following:

Personal information (name, email, student ID, etc.)
Browsing history or page content
Location data
Financial or health information
Authentication credentials or passwords
Usage analytics or telemetry
Any information about which professors or courses you view

What is stored locally

ProfLens stores the following data locally in your browser using Chrome's storage.sync API. This data never leaves your device to our servers:

Your selected school name and RateMyProfessors school ID
The list of website domains where you have enabled ProfLens
Your enabled/disabled preference

This data is synced across your Chrome profile by Google if you have Chrome sync enabled — it is not handled by ProfLens in any way.

Third-party data

When you search for a professor or hover a badge, ProfLens sends a query to RateMyProfessors.com to retrieve professor rating data. This query includes only the professor's name and your school's ID — no personal information about you is sent. Please refer to RateMyProfessors' Privacy Policy for how they handle API requests.

Permissions explained

Permission	Why it's needed
storage	Saves your school selection and active site list locally in your browser
scripting	Injects rating badges onto your course registration page
tabs	Reads the current tab's URL to show the correct per-site toggle in the popup
host permissions	Required to inject badges on university registration pages, which vary by institution

Children's privacy

ProfLens is intended for college students and does not knowingly collect data from anyone under the age of 13.

Changes to this policy

If this policy changes, the updated version will be posted at this URL with a new "Last updated" date. Continued use of the extension after changes constitutes acceptance of the updated policy.

Contact

Questions about this privacy policy? Open an issue on the ProfLens GitHub repository or reach out directly.