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The sources · Set it up in AureoleThe whole world · no key

Source note · News and culture

Books

Open Library’s open catalog: millions of works, their editions, their authors, their subjects. Every record has its link, and anyone can correct it.

8 times more books in English than in Germanone row per language, one cell per decade, from 1500 to today · the lighter, the more there are

1 to 9 books100 to 99910,000 to 99,9991,000,000 or more

EN English, FR French, DE German, ES Spanish, IT Italian, PT Portuguese, NL Dutch, JA Japanese, KO Korean, ZH Chinese, HI Hindi · Open Library, search for works by year of first publication and by language of edition (MARC codes, the ones the tool sends) · a work published in several languages counts in each one1Public data · drawn, nothing generated
93%of the works counted here were first published in 1900 or later, all languages together.
84,333works published in Hindi, the app’s language with the fewest works in the catalog.
464,078works published in German that were first published in the 2010s.

Who publishes this data

Internet Archivenonprofit organization

The Internet Archive is a nonprofit organization founded in 1996, which is building a digital library with the mission of “universal access to all knowledge.” Open Library is one of its projects.4

For this sourceOpen Library aims for “one web page for every book ever published”: a catalog anyone can edit, served by an open API.4

openlibrary.org
Works in English
22,635,169published in English, first published from 1500 to today1
Dataset
Works and editionsauthors, subjects, ISBNs
Coverage
The whole worlda catalog mostly in English
Updated
Ongoinganyone can correct a record
Access
Freeno account, no key · no license claimed

01The reach

Millions of books, from history to cooking.

Ask for books on a subject: Aureole searches Open Library’s subjects and gives each book with its author and its editions. Each rectangle is a subject; fiction is highlighted. A book often has several subjects: the rectangles overlap in the catalog.2

One dot = a thousand books · Open Library subjects (work_count) · fiction highlighted
6.1 millionbooks under these subjects, since a book can have several2
2.6 millionbooks in history, the top subject2

02What you get

Three questions, three answers from the source.

Ask Aureole: the answers below are the ones the source returned.3

You ask

How many editions of One Hundred Years of Solitude are there?

The source returns

208 editions

Open Library · Cien años de soledad, 1967
16 languages · 12 works with the same title

What you get

Works with the same title are all listed

A search returns the work and its neighbors: anniversary editions, adaptations, studies. Aureole presents them all, with their key, without picking one for you.

You ask

Any detective novels to read?

The source returns

A Study in Scarlet, by Arthur Conan Doyle

Open Library · subject “detective fiction” · 186 works
first on the list, the most published first

What you get

Subjects, the way the catalog names them

Open Library orders a subject’s works roughly by number of editions; Aureole gives them in that order. Most of the catalog’s subjects are in English: when a subject returns nothing, the tool suggests its English equivalent.

You ask

Which book has the ISBN 9780375704024?

The source returns

Norwegian Wood

Open Library · Haruki Murakami (村上春樹) · Vintage, 2000
298 pages

What you get

One specific edition, by its ISBN

An ISBN identifies an edition: here, an English translation of a Japanese novel. Aureole gives its publisher, its date and its number of pages, as the edition’s record shows them.

Answers read at the source on October 21, 2026, as examples: sources update, and Aureole reads the current answer when you ask.

03What makes a figure checkable

A checkable figure answers six questions.

A model can write “Cien años de soledad has 208 editions.” For that figure to be checked, you need to know which work it is about, on what date it was read, what it counts, who entered it, who publishes it, and how to run the search again.3

Which work?
Cien años de soledadGabriel García Márquez, 1967
When?
October 21, 2026the catalog changes every day
What?
Editions listednot copies, nor sales

208

editions listed · Cien años de soledad, Gabriel García Márquez

Who entered it?
Libraries and contributorseach record has its history
Who publishes it?
Open LibraryInternet Archive
How to run it again?
The work’s record/works/OL274505W

In Aureole, this information comes with the answer.

The tool’s answer gives each work’s key, its year of first publication and its number of editions, and cites them “according to Open Library”: a catalog built by contributors, whose quality varies from one record to the next.5

A missing book is called “not found in Open Library,” never nonexistent; a busy service is called busy, never “the book does not exist.”

What comes with each work

1
Title, authors, first publication
2
Number of editions · languages
according to Open Library
3
Work key
openlibrary.org/works/OL274505W
4
Recent editions
sorted by date on your Mac

From the tool’s answer, as the app’s code puts it together.

04Where it comes from

From library catalogs to your conversation.

A book’s record passes through several hands before it reaches your conversation. Each one is identified: you know which work you are reading, where its record comes from, and who edited it.

They publish

Publishers and authors

Publishing houses publish books and give each edition an ISBN.

They catalog

Libraries and contributors

The records come from large library catalogs; Open Library’s contributors complete and correct them.

They share

Open Library

The Internet Archive serves the catalog through an open API, with no account and no key.

Aureole

It reads

Aureole, on your Mac

Aureole queries Open Library one request per second, identifying itself, and keeps the answers for the session. It sends only the title, author, ISBN or subject you’re looking for, and the language of the editions; your conversation isn’t sent to Open Library.

DepthThe history of the catalog6

  1. 1996Internet Archive · founded, as a nonprofit
  2. 2007Open Library · launched by the Internet Archive
  3. 2010Open Library · e-book lending

05Limits

What the source doesn’t cover.

And the precautions to take before drawing conclusions.

A catalog built by contributors

Anyone can edit a record: dates, page counts and subjects vary in quality. Aureole cites them “according to Open Library” and never infers a first edition from the order of the editions.

No rights claimed

Open Library claims no rights over its records and gives no license for its covers, which remain the work of their publishers. This page reproduces none of them.

A service made for people

Open Library’s service is made for people looking for a book. So the tool uses it sparingly: one request per second, answers kept in memory, and a busy service reported as such.

What the tool reads at once

At most 20 books per search and 100 editions per book; at most 12 s of waiting, after which the tool says the service is busy.5

On as soon as it’s installedNo account, no key. Nothing to set up.
Settings→ Data sources→ News and culture

Look up a book from your Mac.

Aureole is a Mac app. Download it and ask your question: it finds the work, its editions and its author in Open Library, every record with its link.

Download for Mac
Show the 6 sources for this noteHide the sources
  1. Open Library, search for works, read on October 21, 2026: for each decade from the 1500s to the 2020s and each of the app’s eleven languages, the number of works first published in the decade and published in the language (first_publish_year, language); a work published in several languages counts in each one. Search API.
  2. Open Library subjects (subjects/…json, work_count), read on October 21, 2026: 18 subjects, 6,075,605 works, overlaps included. Subjects API.
  3. Values read at the source: the search for Cien años de soledad (title, author), the subject “detective_fiction,” the ISBN 9780375704024. Cien años de soledad, ISBN.
  4. Who publishes this data, and on what terms: the official pages of the Internet Archive and Open Library, checked on October 17, 2026. Internet Archive, About, Open Library, About, Open Library, Licensing, Open Library, API, Open Library, Covers API.
  5. The fields read, the caps, the timeout and the pace, the sorting of editions and the messages for missing books: the code of Aureole’s Books tool (OpenLibraryNativeToolProvider).
  6. The timeline: the Internet Archive founded in 1996; Open Library launched in 2007; e-book lending opened on June 29, 2010. Checked on October 17, 2026. Internet Archive Blogs, About, Open Library, blog, June 29, 2010.