Write a link to a tag
A tag can hold a website address, and a phone that reads the tag is offered that address. In Hex NFC the address is a URL record. You build the record on your iPhone, then hold the tag against it once to send the record across.
Before you start, have the tag to hand. If you are not sure a tag can still be written, scan it first, as Scan a tag describes. The scan opens the Tag screen. There, Write is available on a tag that still takes a write. It is dimmed on a tag the app reads back as permanently locked, which refuses every write. Tap Close to leave that screen for the home screen, then start at step 1.
Write a link to a blank tag
Paso 1Start a new build
On the home screen, tap Build. The Tag screen opens with no records, under the heading "Empty tag".
Paso 2Add a URL record
Tap Add record > URL. The record editor opens on the new record.
Paso 3Enter the address
In URL, type the address with its scheme in front, for example
https://hex.pro, then tap Save. The record appears in the list. The app writes the address exactly as you entered it and adds nothing. An address that reaches the tag without itshttps://is not a working link. A phone that reads that tag has no page to open.Paso 4Send the record to the tag
Tap Write, at the top of the Tag screen. The write screen opens and reads "Hold tag against the top of your iPhone". iOS puts its own scan sheet over the app, carrying the same line.
Paso 5Hold the tag against your iPhone
Rest the top edge of your iPhone on the tag and keep it there. The screen reads "Writing…", then "Verifying…". Nothing in this step locks the tag. You can write over it again as often as you like. The success wording, "Locked in", says only that the records went across and read back intact. The screen closes on its own and the Tag screen comes back.
Writing replaces everything the tag held. If you want to keep some of what is already on a tag, scan it first. Edit that list instead of building a new one, as Edit a tag's records describes.
What the app checks before it says it worked
The app never takes the tag's word for a write. It sends the records, reads the tag again and compares what came back with what it sent. "Locked in" means the tag was read back holding exactly what you wrote.
One state stops the write instead of finishing it. On a tag whose password gates its records, the write screen reads "Tag is protected" and asks for that password before anything is written. Type the password into Tag password (4 bytes) and tap Unlock & write. Then hold the tag against the top of your iPhone again. That second tap is the one that authenticates and writes. The app skips the prompt when it already holds the password from the time you protected the tag. The write goes through on the one tap. If you do not know the password, tap Cancel: your records stay on the Tag screen. See Tag protection for what a password does to a tag.
A tag with no header for records to sit in is not stopped before the write. The app sends the records, the read-back finds nothing readable on the tag, and the write ends on "Write failed".
What keeps you out of that is a scan. On a tag the app scanned as unformatted, the Tag screen shows "This tag isn't formatted" above the record list. Under it the screen reads "It has no Capability Container, so records written now won't be readable. Format it first." Tap that notice to open the Operations screen and format the tag. A tag you started from Build has no scan behind it, so the Tag screen has nothing to warn you with.
Records you have built are not lost to the repair. Tap the menu button at the top right of the Tag screen, then Operations…. The Operations screen opens over the Tag screen. Your records are still there when you close it. See Erase or format a tag.
To stop a write before it starts, tap Cancel on the write screen while it is still waiting for a tag. Your records stay on the Tag screen.
If the write fails
A write that fails, or a read-back that differs from what was sent, ends on "Write failed" with the reason under it. From there:
To send the same records again, tap Try again. You keep anything you have already typed.
To go back to the Tag screen without writing, tap Close.
A tag that keeps refusing may be the wrong kind for what you are writing. Tags that work with Hex NFC says which chips the app recognises, and the chip support matrix has the detail per chip.