The measurements you type describe your house. They are treated that way.
What happens to what you type
- Calculations run on your device once the page has loaded. Nothing you type is sent anywhere, ever — not to be worked out, not to be counted, not at all.
- Measurements live in the address bar so a link can carry them. That address is never written to our logs: the query string is stripped before anything is recorded.
- There is no account, no sign-in, and no email field anywhere on the site.
- Nothing is stored in your browser either. No local storage, no session storage, no database. Close the tab and nothing of yours remains.
What we count
We count eight things, so we know which parts of the site are worth building on: that a calculation happened, that an area was added, that an assumption was edited, and that print, copy link, a follow-on tool, the image or the spreadsheet was used.
Each one is a name and nothing more. There is no number attached to it, no measurement, no price, no assumption you changed, and no address — because the address is your project.
Those counts go to Google Analytics, and three things are set so that they can:
- It runs without cookies. No cookie is set, nothing is written to local storage, and so there is no identifier that could join two of your page views together. That is the point of it, not a side effect.
- The page reports its own address, with the query string removed, rather than letting the tag read the address bar. The query string is your measurements, and it never leaves your device.
- Nothing is fetched until the page has finished rendering, so measurement can never be the reason a page is slow.
If your browser sends Global Privacy Control or Do Not Track, nothing is loaded and nothing is counted.
Counting is off entirely unless the site is running with a measurement id configured. Where it is off, these pages load nothing from anywhere.
Third parties
Pages load no third-party resources before they finish rendering: no web fonts, no content delivery networks, nothing that blocks the page.
Advertising, where it appears, loads after the page is complete and is held to reserved space so nothing moves under your finger. Unlike the counting above, an ad network does set cookies — so you are asked first, through a consent dialog, and nothing from the network loads until you have answered. Where no ad network is configured, no advertising space is drawn at all.