Typo detection comes from the check character. Collision-free minting comes from the ledger. They are different promises — and we never blur them.
Every single-character error and adjacent transposition is caught by the ISO 7064 check character. The math is public and reproducible.
The database makes overlapping ranges physically un-committable with a range EXCLUDE constraint — independent of the check character.
An append-only ledger records every mint. Export the full history anytime; it is never gated behind billing.
Pick a check-character format from seven presets, or configure your own. Live preview as you type.
Allocate collision-free IDs per site. Idempotent, atomic, and claimed in the ledger the instant they are issued.
Render QR label sheets, then validate scanned IDs anywhere — in the browser, offline, or over the API.
Free to start. No collisions, by construction.