QSeq

Sustainable Identity on Every Thing

Open identity tooling for
every physical object.

QSeq mints Barcodes, QR Codes and Data Matrix carriers for SGTINs, GS1 Digital Links, EPC URIs and NATO Stock Numbers — with a print-true physical-size calculator so what you design is exactly what prints.

Open the generator Download for macOS Why open source →

Native macOS app (Apple silicon) · unsigned build — right-click → Open on first launch · © 2026 Meerv Inc.

Generator

Serialization

Each serial extends the GTIN to an SGTIN — the GTIN (AI 01) plus this serial (AI 21) — so the GS1 Digital Link /01/<gtin>/21/<serial> resolves for every code.

Why this is open source

QSeq is released as open source to accelerate the transition to Sustainable Identity on Every Thing (SIoT): a future where every physical object carries an open, web-resolvable, standards-based identity — GS1 Digital Links, SGTINs and compatible carriers — that anyone can read, verify and build upon without proprietary lock-in.

Durable, interoperable identity is the foundation of the circular economy. Reuse, repair, recall, provenance and end-of-life tracking all depend on a code that still resolves years after it was printed. Keeping the tools that mint those identities open means the infrastructure of identity stays a public good — not a toll booth.

Standards-first

GS1 Digital Link, SGTIN, EPC Tag URI, GS1-128, Data Matrix — no bespoke formats.

Print-true

Exact-DPI sizing with mm + inch + vernier rulers so the print matches the intent.

Yours to fork

Raw parameters export to editable JSON. Generate designs from your own pipelines.

Why “QSeq”?

Seq is sequence — QSeq exists to mint ordered, serialized identities. The Q is chosen deliberately: every reading of it lands on exactly what a well-formed sequence of identity codes must be — ordered, robust and resolvable.

Quality factor, quanta, queue, cue, QR — four meanings and a carrier, each independently true, all pointing to the same idea: a quality-assured, ordered, resolvable sequence of identity codes. That is QSeq.

About QSeq

QSeq was designed and written collaboratively with Claude (Anthropic) in a single continuous pair-programming session on 7 June 2026 — from an empty directory to a tested, native macOS application and this companion website. Every capability was added iteratively and verified with automated tests and a real build.

  1. Core engine — QR / Data Matrix / 1D generation with a live physical-size calculator.
  2. GS1 identity — SGTIN as element string, EPC Tag URI and GS1 Digital Link.
  3. Defense identity — NATO Stock Number parsing (NSC / NCB / NIIN).
  4. Combined labels — 1D + 2D for the same item.
  5. Serial captions — serial printed under each code, incrementing digits in bold.
  6. Structure-aware dead-space — logos never destroy QR finder/timing/alignment patterns.
  7. Composable workspaces — 1D / 2D / combined, single or serialized sheets, with a serialization log.
  8. Project files — all parameters as editable JSON.
  9. Print-true rulers — mm + inch + vernier ticks at exact DPI.

Why Flutter?

QSeq is written in Flutter / Dart so a single codebase serves every surface. The macOS app you can download today is the first target; the same Dart source compiles to a forthcoming Windows desktop build and to the web — and this site's generator mirrors that exact logic. One implementation of the encoders, capacity tables, sizing math and rendering means an identity minted on macOS, Windows or the browser is byte-for-byte the same.

For infrastructure meant to outlive any one platform, that matters: Sustainable Identity needs sustainable, portable tooling. A single, open, well-tested codebase across desktop and web is the cheapest path to keeping these tools alive, auditable and consistent for the long haul.

QSeq · © 2026 Meerv Inc. · Licensed under the PolyForm Noncommercial License 1.0.0 — released as source-available in service of Sustainable Identity on Every Thing.