Sail measurement, on the sail
Every SailTag carries a QR code and a unique number. Scan it with any phone and see which sail it is, how it was measured or approved, by whom and when — no app, no account. For any sail, under any rule, anywhere in the world.
Code too salty or creased to scan? Type the number printed on the tag.
How it works
Measurers and sailmakers put the data in. Anybody reads it back by scanning. It works for every sail in the sailing world.
Tags are issued in numbered series by national sailing authorities and rating organisations. Each one is tamper-evident and printed black on white with its number in plain text above the QR code.
The measurer or sailmaker enters the sail against the tag — measured under ORC, IRC, DH or class rules, or simply approved by the sailmaker.
A race official, an owner or a buyer scans the code and sees the current measurement, marked as current, with every earlier one kept below it.
The tag number
Three letters for the issuing organisation, a dash, six digits. The same number is encoded in the QR code as a plain web address, so if a code is ever too far gone to scan, the number can simply be typed in.
https://sailtag.com/t/DEN-000123
Who issues tags
Tags are not free-floating. They move down a chain in numbered blocks, and a measurer can record only against tags in the range they were given — in their own name.
Issues a numbered block to each organisation and produces the printable tags.
A national authority such as DEN or GBR, or a rating body such as ORC or IRC. Hands ranges from its block to its own measurers and sailmakers, and answers their orders for more.
Records measurements against the tags in their range. A sail loft can work for several organisations at once.
Scans and reads. No login, no account, no app.
What a scan shows
Tag number, sail, the rule it was measured under, every value with its unit, the date and the name of the measurer. A re-measurement is added, never overwritten — the newest is marked current, the rest stay below as history.
| MHB | Head width | 0.18 m |
| MUW | Upper width | 1.52 m |
| MTW | Three-quarter width | 2.71 m |
| MHW | Half width | 3.88 m |
| MQW | Quarter width | 4.79 m |
Illustration with example values.
Rules & approval
From a Grand Prix spinnaker to a club dinghy's mainsail. Measured sails are checked field by field against the rule — code, description and unit. Class sails with no measurements at all can carry a tag too, approved by the sailmaker.
Why trust it
Designed around the moment it matters most: a race official on a dock, a phone, and a sail that has seen a season.
A short plain address gives a compact QR code with large modules and maximum error correction — robust against salt, creases and a phone held at an angle.
Tags are pure black on white. Highest contrast on a wet sail, and nothing that fades into an unreadable colour.
A tag cannot be moved from one sail to another. Try to lift it and it shows — so the record stays with the sail it was issued for.
Scanned or typed, every lookup lands on the same page by the same route. den-123 becomes DEN-000123.
The public side is read-only and lives on its own domain, separate from the dashboard where measurers work. A scan never carries a session.
A whole club on one wifi checking sails in an afternoon is the product working as intended — limits are set far above any real crowd.
Look up a tag
Scan the code with your phone's camera — or type the number printed above it.