QuietMap
Privacy policy
Last updated 4 October 2026.
This policy covers the QuietMap extension for Chrome ("the extension") and the QuietMap address report at quietmap.whitehatharbor.com ("the report"), built and supported by Michael Costa, trading as White Hat Harbor ("we"). In short: the extension reads where the listing you're viewing is, looks up its noise data on your computer, and sends nothing about you or the listing to us or anyone else. It collects no personal information. If you buy a report, Polar handles the payment.
What the extension reads
The extension runs only on www.zillow.com, www.redfin.com and www.realtor.com, and only does anything on a page for a single home or apartment. There it reads two things the page itself publishes: the listing's map coordinates (latitude and longitude) and its street address, from the page's location meta tags and structured data. It reads nothing else on the page: not your account, saved homes, searches, messages or anything you type.
What the extension downloads
To score a listing, the extension downloads our published data files from quietmap.whitehatharbor.com: a small list of the current files, an index for a large region (about 87,000 km²), and the data file for the area around the home (about 250 km²). It works out the score on your computer from those files and keeps them in the browser's cache so it doesn't download them again. The requests ask for files by name; they don't include the listing's address, coordinates or which home you're viewing.
Like any website, our host, Cloudflare, receives your IP address and browser details with each request. We don't run analytics on these data files and don't keep logs of who downloaded them.
What is stored, and where
| Data | Where |
|---|---|
| Where you dragged the tab on the edge of the page (a position, nothing else) | Chrome's local extension storage on your computer |
| The downloaded data files | The extension's cache on your computer. Files the current data no longer uses are deleted. |
The extension keeps no history of the listings you view.
The address report and Polar
The drawer has a link to the full report for that listing. Only when you click it, the link opens quietmap.whitehatharbor.com with the listing's street address and coordinates in the page address, so the report page can show that home. The report page also lets you type an address: it goes through our server to the US Census Bureau's geocoder to find it on the map. The free preview and the report itself are worked out in your browser from the same data files. The preview shows the spot it found on a small street map so you can check the pin; that street background comes from OpenFreeMap, like the full map's (below). If you move the pin, the point you pick is what the checkout carries and the report covers.
If you buy a report, our server creates a checkout at Polar, the merchant of record, with the address and its coordinates attached so the report covers the home you paid for, and your IP address so Polar can work out sales tax. You give your email address and payment details to Polar directly, on its pages, under its own terms (Polar privacy policy). Afterwards the report page asks Polar whether that checkout was paid. "Lost your report link?" sends the email address and invoice number you enter to Polar to find your purchase. We receive your email address, the address you bought the report for and the payment status from Polar, to support you and handle refunds. We never see your card details.
If you buy a day pass or a hunt pass, the checkout works the same way (the address you were looking at, if any, rides along so the page can open it afterwards). After payment our server asks Polar for the pass's license key and shows it to you. The report page and the map keep the key in your browser's local storage on quietmap.whitehatharbor.com, and send it through our server to Polar each time they check the pass is still active; our server remembers a valid answer for up to 10 minutes, filed under a one-way hash of the key, not the key itself. A pass works on a few devices at a time, so the first time you use it in a browser our server also sends Polar a device id (a random number the page makes and keeps in local storage) and a label naming the browser and system, such as "Chrome on macOS · QuietMap". Polar keeps both with your key and shows the label in its customer portal, where you can free a device. The page keeps the activation id Polar returns next to the key. "Forget this key" on the report page deletes the key and the activation id from your browser and tells Polar to free that device.
The full map on quietmap.whitehatharbor.com (included with a pass) reads the same data files. Its street background (map tiles, fonts and icons) comes from OpenFreeMap, built from OpenStreetMap data: your browser requests them straight from OpenFreeMap's servers, which see your IP address and which part of the map you're viewing, under its privacy policy. Its address search works like the report page's: what you type goes through our server to the US Census Bureau's geocoder. "Use my location" asks your browser for your position only when you tap it; the map uses it on your device to find the block you're on and moves the map there, which downloads our data file for the area around it (about 250 km²) by name and the street background for that spot from OpenFreeMap, as moving the map by hand does. The position itself isn't sent to us or anyone else, and isn't stored.
Our server's logs (Cloudflare) keep the details of these report requests, including any address searched, for up to 7 days to fix problems, and then delete them.
The websites
The QuietMap web pages (quietmap.whitehatharbor.com) and whitehatharbor.com count page views with Cloudflare Web Analytics, which sets no cookies and doesn't identify visitors. This covers the web pages only; the extension itself sends no analytics.
What we don't do
- No analytics, tracking, advertising or telemetry in the extension.
- We don't sell, share or transfer data about you, except as needed for payments above.
- We don't use data for creditworthiness or lending, or for any purpose unrelated to the extension's single purpose.
- The extension loads no code from the internet; everything it runs ships inside it.
The use of information received from Chrome APIs adheres to the Chrome Web Store User Data Policy, including the Limited Use requirements.
Deleting your data
Removing the extension deletes everything it stored on your computer. To have Polar's record of a purchase deleted, or to ask us anything about your data, email support@whitehatharbor.com.
Changes
We'll update this page and its date if the extension's or the report's data handling changes.