Levy.

Privacy / A Digitopia Labs tool
Privacy

Your figures
stay in your browser.

Levy has no account, no database and no cookies. There is no server to send a calculation to, because every sum on the page is worked out on your own machine.

The calculation

The amount, the rate, the bar and the flat rate comparison are all computed in your browser. Nothing is sent anywhere and nothing is written to storage.

The ledger

Kept sums live in the page for as long as the tab is open, and go when you close or reload it. That is why the tool says to copy them before you leave. They are never part of a share link.

The share link

Share puts the figures you typed into the address itself - the amount, the second amount when you are solving a rate, the rate, the mode and any trade you picked - so that anyone with the link sees the same calculation. Nothing is stored at our end, and the link carries no ledger and no pinned comparison.

Measurement

Counted, not watched.

Levy counts visits with Vercel Web Analytics. It sets no cookies and no storage of any kind, and it has no identifier for you - a visit is counted against a hash of the request that is thrown away within the day, so we cannot tell a returning visitor from a new one, and we cannot follow anyone between our tools. We checked that ourselves rather than taking the supplier’s word for it.

The address bar is stripped before anything is sent, so the figures you type are never in it. Beyond that it counts which actions happen - a mode changed, a sum kept, a link shared - and never what you typed. No amount, no expression, no ledger name is ever part of an event.

Until 17 September 2026 this page was wrong about that. It said Levy used Google Analytics “configured to set no cookies at all”, on the strength of a setting called client_storage: "none". That setting does nothing: it belongs to an older version of Google Analytics, and the current one writes a cookie regardless. We found it by wiping the cookies, reloading and watching them come back. Google Analytics has now been removed from this tool altogether, which is what made the sentence at the top of this page true.

The address bar is trimmed before anything is reported. Because a share link carries your figures in the query string, the default behaviour would post them into our analytics on every visit without you doing anything. Levy replaces both the reported address and the reported referring address with the bare path, so the numbers never arrive.

Until 16 September 2026 only the first of those two was replaced. If you had opened somebody’s share link and then clicked a link on the page, the figures in that link reached Google as the referring address. That is fixed, and it is written here rather than quietly corrected, because a privacy page is worth nothing if it only records the version of events that flatters us.

Your IP address reaches Vercel, who host Levy, as part of any request to any website, and is used for approximate location. We do not store it.

Levy is made by Digitopia Design Ltd, a company registered in England and Wales, number 12037302, registered office 124 City Road, London, EC1V 2NX, trading as Digitopia Labs. Our ICO registration is ZC160761. For anything on this page, or to ask what we hold about you (which should be nothing), write to hello@digitopiadesign.com.

We count visits on the basis of our legitimate interest in knowing which parts of the tool get used. The counting is done by Vercel, who host this tool, so it goes no further than the company already serving you the page. Vercel is a US company, so that processing happens outside the UK under the standard contractual clauses in their data processing terms.

You can ask for a copy of anything held about you, ask for it to be erased, or object to the counting altogether, at hello@digitopiadesign.com. If you think we have got something on this page wrong, you can also complain to the Information Commissioner’s Office at ico.org.uk.

Last updated 18 September 2026.