Why a link and not a number
A size sent as text has lost the thing that makes it usable
"She's a 7" is four characters short of an answer. A 7 measured on a card-calibrated screen is good to about ±0.15 mm — a fifth of a US size — and worth ordering against. A 7 remembered from a shop visit five years ago is worth re-measuring. Sent as plain text, the two are indistinguishable.
So the link carries the measurement rather than the label: the inside diameter in millimetres, the band width it was adjusted for, and which calibration method produced it. The card reconstructs the error bar from those, and states it beside the size.
There is no account and no database behind this. The address bar is the whole mechanism — which is also why the link never expires, and why it contains nothing about the person who measured beyond the width of one finger.
What people use it for
Three moments where a size needs to travel
- Sizing a surprise
- Borrow a ring they already wear, measure it, keep the link. Months later the number is still there with its tolerance attached, instead of half-remembered.
- Measured on a phone, ordering on a laptop
- The calibration lives in the browser that made it. The link carries the result to whichever device you actually check out on.
- Answering "what size are you?"
- Send the card rather than a number, and whoever is buying gets the size in their own market’s scale without converting anything.
Questions
Shared sizes, answered
What is in this link?
An inside diameter in millimetres, the band width it was adjusted for, and which calibration method produced it. Nothing else — no name, no account, no identifier. The link is the storage; nothing about the measurement is kept on a server.
Why does the link carry an accuracy figure?
Because a size without one cannot be acted on. "US 7" from a card-calibrated screen is worth ordering against; the same number typed from memory is not. The link keeps the two distinguishable, which a size sent as plain text cannot.
Does the link expire?
No. The measurement is encoded in the address itself, so the page will render it as long as the site exists. Bookmark it, and re-measure if a few years pass — fingers change.
Can I edit a size someone sent me?
Not on this page, deliberately — an editable shared result stops being a record of what was measured. Take your own measurement instead and share that; it takes about a minute.
Is it safe to send?
A ring diameter is not personal data in any meaningful sense, and the link contains nothing that identifies who measured. It is as safe as texting a shoe size. Anyone with the link can open it, so treat it as public rather than private.