Privacy Policy

Last updated 27 August 2026.

The numbers you type

Every answer on this site is worked out by code running in your own browser. What you type into a blank is not sent to a server, not saved, and not recorded anywhere. It exists only in the page while that page is open, and it is gone when you close or reload it.

There is nowhere for it to be sent. The site is a set of static files with no database and no server-side code that could receive it.

Analytics

The site uses Google Analytics (property G-M5123BCH1W) to count visits, so that there is some idea of whether anyone is using it. It collects:

• which pages were viewed, and when
• an approximate location — country, region, sometimes city — worked out from your IP address
• the kind of device, operating system and browser you are using
• the site or search engine you arrived from

It is worth being exact about what that amounts to, because “analytics” is often taken to mean nothing but totals. Google Analytics gives your browser a randomly generated identifier and keeps it in a cookie, so the same browser is recognised when it comes back. What is collected is therefore not only a total: there is a per-browser record, and anyone with access to this property can look up a single identifier and read the sequence of pages it visited.

That record carries no name, email address or account, because the site has none to give it and never asks for one. But not being tied to a name is not the same as being anonymous, and it is not the same as being aggregate-only. The right word is pseudonymous: a real record of one browser, kept under a number instead of a name. Google’s User Explorer is the tool that reads such a record, and it is also what can delete an individual one.

Google Analytics does not log or store full IP addresses; it uses the address to work out approximate location and discards it.

Google is a separate company and handles what it collects under its own terms. See Google’s privacy policy and how Google uses data from sites that use its services.

Cookies

Google Analytics sets two cookies. _ga holds the identifier described above, which is what lets a returning visit be told from a new one; it lasts until it expires or you delete it. _ga_M5123BCH1W holds the state of the visit you are currently making. The identifier is a randomly generated number rather than anything about you — but it is persistent, which is the whole point of it.

Nothing else on the site sets a cookie. There is no advertising, no tracking pixel, no social widget and no session recording.

Hosting

The site is hosted by Vercel. As with any web host, Vercel’s servers handle the requests your browser makes — which includes your IP address and the browser you are using — in order to deliver the page and to guard against abuse. That is a technical necessity of serving a website rather than a choice this site makes about you. See Vercel’s privacy policy.

What the site does not do

• no accounts, logins or profiles
• never asks for your name, email address or any other personal detail
• no advertising, and no advertising networks
• nothing is sold, and nothing is shared with anyone beyond the analytics described above
• no tracking pixels, social widgets or session recording

Your choices

Three different things get run together under “turning off analytics”, and only the last of them actually does it.

• Deleting the cookies resets your identifier. It does not stop collection. Clear _ga and your next visit is recorded under a new number, as though a new browser had arrived. Collection carries on, and the earlier record stays where it is.
• Blocking cookies alone is not a reliable way to stop it either. Google’s tag does not depend on cookies in order to send data, so refusing them can leave the measurement running without the part that recognises you. Google’s tag documentation sets out what the tag does in that case.
• Blocking the script is what stops collection. Use Google’s opt-out browser add-on, a content blocker, or a browser with tracking protection. Nothing is then sent at all, and the site works exactly as it does otherwise — every answer is worked out in your browser regardless.

Since there is a record of your browser, it is worth saying plainly what can and cannot be done about it. This site keeps nothing itself: no server, no database, no log of its own, so there is nothing here to send you or to delete. The record lives in Google Analytics, keyed to the identifier in your _ga cookie — and because the site never learns who you are, it has no way of telling which identifier belongs to you, and so cannot look one up on your behalf.

What you can do is act on it directly. That identifier is readable in your own browser’s cookie storage; clearing it breaks the link between you and everything recorded before, and blocking the script stops anything further being added. The data Google already holds is governed by Google’s own controls and retention, linked above.

Children

This is a general-purpose tool and is not directed at children. It does not knowingly collect personal information from anyone, of any age.

Changes to this policy

If this policy changes, the new version is posted on this page with a new date at the top. There is no mailing list to announce it on, because the site does not collect addresses.