# LinkShift

> A QR code you print once. Where it points follows a schedule you set: windows, repeating hours, days of the week, priority, and a fallback. For menus, badges, packaging, signage — anything where ink is permanent and the destination isn't.

Made by Atomic Locomotive (atomiclocomotive.com), Austin, Texas. Free while we find out what it's worth.

## Pages
- [LinkShift for equipment and asset tags](https://linkshift.co/equipment/) — The tag on a machine outlives three revisions of the manual and two service contracts. A QR code that points at the current manual, the number that's answered today, and the right page after hours.
- [LinkShift for events: badges and signage](https://linkshift.co/events/) — Print 400 badges once. The QR on them goes to the agenda before the keynote, the slides during it, the feedback form after, and the recording next week.
- [LinkShift FAQ](https://linkshift.co/faq/) — Straight answers about printing, scheduling, scanning, privacy and what LinkShift costs.
- [How LinkShift works](https://linkshift.co/how-it-works/) — Create a code, print it once, then set rules for where it points and when. Windows, repeating hours, days of the week, priority, and a fallback that always catches the rest.
- [LinkShift — a QR code you print once](https://linkshift.co/) — LinkShift is a QR code for things you can't reprint: the menu, the badge, the box, the sign. Where it points follows a schedule you set, and you never print again.
- [LinkShift for product labels and passports](https://linkshift.co/labels/) — A label stays on a product for its whole life. What sits behind its QR code changes as the product does, and somebody has to show what it said last March. GS1 Digital Link, lots, recalls, and the record.
- [Privacy](https://linkshift.co/privacy/) — What LinkShift records when a code is scanned, what it never records, and what it keeps about account holders.
- [LinkShift for books and publishing](https://linkshift.co/publishing/) — A book is printed once and read for ten years. The companion link in chapter nine should still work in 2036. A QR code that never changes, pointing where you say.
- [LinkShift for restaurants and cafés](https://linkshift.co/restaurants/) — One table tent, laminated once. Breakfast, lunch, happy hour, dinner, late night and brunch, each with its own page, on a QR code that never changes.
- [Where a LinkShift code belongs](https://linkshift.co/use-cases/) — Menus, badges, packaging, books, product labels, signage. Anywhere a link is already out in the world and has to mean something different later.

## Facts
- The QR encodes a permanent short link; rules decide the destination at scan time.
- Rules: bounded or unbounded windows, daily or weekly recurrence, midnight-crossing windows, priority ordering, a non-empty fallback.
- Every scan is a 302. Destinations are never cached.
- Scans record device, country, referrer and the active rule. The IP address is discarded, never stored.
- Custom domains are verified by a TXT and a CNAME record; an unverified domain never reaches a printed code.
- Archived codes show a retired message; codes are never silently deleted.