Stats

What the catalogue knows, and how well it knows it: editions by source and tier, records by conformance level, claims by producer weight.

snapshot 2026-09-18 00:28 UTC · refreshed every five minutes

Editions889,495685,762 covers fetched

Spine colours686,35477.2% of editions

Shelf-ready428,171colour, height and thickness

End to end13.7 kmof shelf, summed thickness

Measurements held2,954,1831,374,246 colour · 1,579,937 size

Confidence

Editions by tier

Spine colour

Verified	0	0.0%
Estimated	588,752	66.2%
Guess	97,602	11.0%
Unknown	203,141	22.8%

Height

Verified	0	0.0%
Estimated	263,650	29.6%
Guess	343,334	38.6%
Unknown	282,511	31.8%

Thickness

Verified	0	0.0%
Estimated	258,800	29.1%
Guess	491,028	55.2%
Unknown	139,667	15.7%

Nothing is Verified, and that is the honest figure: Verified means a person held the book. The ceiling here is 0.90 — imprints whose every spine is the same.

Colour

Winning source

cover edge

683,6320.56

no measurement

203,141

series default

2,7220.90

Right-hand column: mean confidence of the winning measurement.

Thickness

Winning source

page-count estimate

491,0280.40

Open Library

258,7690.65

no measurement

139,667

series default

310.75

Right-hand column: mean confidence of the winning measurement.

A page-count estimate runs high on long books: publishers move to thinner paper exactly as a book gets fat.

Vocabulary

18 buckets, as measured

white110,210

black89,962

grey61,344

blue53,528

yellow51,704

beige43,522

taupe36,855

brown36,848

red33,966

purple32,347

orange27,735

green25,365

ivory17,430

charcoal15,022

warm white14,430

cream14,173

multi12,174

pink9,739

Kinds of book

Genre, from classifications

Fiction

145,415

Non-fiction

387,036

Poetry

11,200

Drama

4,284

No evidence either way

341,560

Derived from Dewey and Library of Congress classes and from subject headings, each with its source and confidence. Unknown is never counted as non-fiction.

Kinds of book

Languages and audience

English

403,841

French

29,088

German

28,112

Spanish

24,104

Chinese

13,959

Mandarin Chinese

4,399

Dutch

4,247

Italian

2,489

Children's: 45,574
Young adult: 4,693
Weighed: 260,466 editions, as published

VER plane

Records and claims

Records: 73 · L1 73
Claims: 40
weight 1.00: 40 · 40 signature-valid

Records carry hashes only. Nothing here has been published: PUBLISH=false.

Acceptance

Gates

last run 2026-09-11 · 202 passed, 1 failed, 12 skipped

A1Seed and ingest idempotency	12/12	green
A2Extraction determinism; bad ICC fails closed	8/8	green
A3The thesis: colour is manufacturable (a) resolved bucket · (b) height within 6 mm · (c) raw cover edge alone	23/25 · 11/12 · 13/13	green
A4Colour parity: Python, TypeScript, SQL	34/34 pairs	green
A5Search shapes The Verified-only case skips: no edition is at 0.95 or better yet.	pass	green
A6Fill a gap, identically three times	9/9	green
A7Vision: forced schema, cached, capped Costs money, so it runs only with a key. Passed with a live call on 2026-09-10.	not run	skipped
A8A hand measurement outranks everything, once	5/5	green
A9Every buy link resolves	live	green
A11Search latency, median Bucket path 97 ms against 150 — passes. Exact-colour path 628 ms against 300 — fails. 686,354 editions, measured with the ingest pipeline running.	97 ms · 628 ms	red
A12The conformance gate Every record through the real ver_validator: exit 0, zero errors.	73/73 records	green
A13Claims validate, verify and refuse	26/26	green
A14Trust ordering and quarantine Includes the five tests that pin the own-claim laundering fix.	21/21	green
A15Shelf-crop lineage under 1.1-draft Local only; runs under SPINE_SCHEMA=1.1-draft and is skipped otherwise.	11/11	green
A16Federation round trip	11/11	green