Studbook

Studbook is a catalogue for your LEGO collection.

Photograph a set and Studbook reads the number off the box where it can, or proposes a ranked shortlist of what the build might be. You confirm against the official catalogue image — nothing is accepted for you — then record what you own: its condition, whether the box and instructions are still there, what you paid, and what it is worth now.

• Identify a set from a photo, against a locally mirrored catalogue
• A ranked shortlist with per-candidate confidence, never a single guess
• Record condition, box, instructions and notes for each copy
• Track what you paid and what BrickLink says it is worth
• See, filter, sort and search the whole collection
• A read-only link to share the collection you choose to show
• Sign in with a passkey, an authenticator code, or a password

Studbook is self-hosted. It runs on a machine you or someone you know owns, and your account, your collection and your photographs stay on that machine. A photograph is sent to Anthropic only if you press Ask Claude on a set the local model could not help with — never automatically. Set details and prices are queried from public catalogues such as Rebrickable and BrickLink; those requests carry nothing about you.

Studbook is an independent, unofficial project. It is not affiliated with, endorsed by or sponsored by the LEGO Group. LEGO is a trademark of the LEGO Group, used here only to describe the sets the app is used to catalogue.