Sites like WorldCat

01 · Entity

About WorldCat

WorldCat worldcat.org

WorldCat.org

WorldCat.org is a global catalog of library materials. You can search for books, music, video, articles and much more at libraries near you.

Wikidata: international union library catalog

Top 10K · #3,271 English 10 technologies Crawled Nov 6, 2026

Visit WorldCat

Summary by Claude

WorldCat.org is a free public search interface to a global union catalog of library holdings, letting users find books, music, video and articles and locate them in nearby libraries. It is operated by the nonprofit cooperative OCLC and includes lists, citations and interlibrary loan trends.

Who it’s for

Library users, researchers, students and librarians

Business model

Nonprofit; funded by OCLC member library subscription services

• library union catalog
• library catalog search
• find books in nearby libraries
• interlibrary loan
• bibliographic database
• citation generator
• reading lists
• library holdings lookup

02 · Embedding space

Competitor map

Each alternative by how close its vector is to WorldCat’s (x) and how much traffic it gets, how much of the stack it shares, or where it sits in the embedding space itself (y). Lines split each axis at the median. Hover for the numbers, click to jump to it in the list.

1. 01
   OCLC oclc.org Top 10K English

   global library cooperative

   • Cloudflare
   • Meta Business Suite
   • OneTrust
   • Apple Business
   • Canva
   • Google Search Console

   0 say OCLC is a good alternative to WorldCat 0 say OCLC isn’t a real alternative to WorldCat

   Comment
   Very close cos 0.932
2. 02
   Open Library openlibrary.org Top 10K English

   Welcome to Open Library | Open Library

   Open Library is an open, editable library catalog, building towards a web page for every book ever published. Read, borrow, and discover more than 3M books for free.

   • Bing Webmaster Tools
   • Google Search Console
   • Matomo
   • nginx

   0 say Open Library is a good alternative to WorldCat 0 say Open Library isn’t a real alternative to WorldCat

   Comment
   Very close cos 0.906
3. 03
   Zotero zotero.org Top 10K English

   Zotero | Your personal research assistant

   Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

   • Amazon SES
   • Apache HTTP Server
   • Amazon CloudFront
   • Microsoft 365
   • Amazon Route 53

   0 say Zotero is a good alternative to WorldCat 0 say Zotero isn’t a real alternative to WorldCat

   Comment
   Close cos 0.886
4. 04
   Goodreads goodreads.com Top 1K

   Goodreads | Meet your next favorite book

   Find and read more books you’ll love, and keep track of the books you want to read. Be part of the world’s largest community of book lovers on Goodreads.

   • React
   • Atlassian
   • Canva
   • Amazon CloudFront
   • Google Search Console
   • Microsoft 365

   0 say Goodreads is a good alternative to WorldCat 0 say Goodreads isn’t a real alternative to WorldCat

   Comment
   Close cos 0.884
5. 05
   Internet Archive archive.org Top 1K English

   Internet Archive: Digital Library of Free & Borrowable Texts, Movies, Music & Wayback Machine

   U.S. non-profit organization and digital archive

   • Atlassian
   • Google Search Console
   • Google Workspace
   • Microsoft 365
   • nginx
   • Salesforce

   0 say Internet Archive is a good alternative to WorldCat 0 say Internet Archive isn’t a real alternative to WorldCat

   Comment
   Close cos 0.884
6. 06
   Wikibooks wikibooks.org Top 10K English

   Wikibooks

   free multilingual online collection of textbooks

   • Google Search Console

   0 say Wikibooks is a good alternative to WorldCat 0 say Wikibooks isn’t a real alternative to WorldCat

   Comment
   Close cos 0.885
7. 07
   Our World in Data ourworldindata.org Top 10K English

   Our World in Data

   Research and data to make progress against the world’s largest problems.

   • Cloudflare
   • Cloudflare DNS
   • Cloudflare Web Analytics
   • Google Tag Manager
   • Meta Business Suite
   • Google Search Console

   0 say Our World in Data is a good alternative to WorldCat 0 say Our World in Data isn’t a real alternative to WorldCat

   Comment
   Close cos 0.883
8. 08
   Wikiquote wikiquote.org Top 10K English

   Wikiquote

   free multilingual online collection of quotes

   • Google Search Console

   0 say Wikiquote is a good alternative to WorldCat 0 say Wikiquote isn’t a real alternative to WorldCat

   Comment
   Close cos 0.882
9. 09
   United States Copyright Office copyright.gov Top 10K English

   U.S. Copyright Office | U.S. Copyright Office

   Copyright Office Homepage

   • Cloudflare
   • Cloudflare DNS
   • Adobe Experience Platform Tags
   • Amazon SES
   • Bootstrap
   • Font Awesome

   0 say United States Copyright Office is a good alternative to WorldCat 0 say United States Copyright Office isn’t a real alternative to WorldCat

   Comment
   Close cos 0.881
10. 10
    Archive of Our Own archiveofourown.org Top 10K English

    Request temporarily denied. | Archive of Our Own

    nonprofit online fanfiction repository operated by the Organization for Transformative Works

    • Cloudflare
    • Cloudflare DNS
    • Google Search Console

    0 say Archive of Our Own is a good alternative to WorldCat 0 say Archive of Our Own isn’t a real alternative to WorldCat

    Comment
    Close cos 0.881
11. 11
    Library of Congress loc.gov Top 1K English

    Home | Library of Congress

    The world's largest library. View historic photos, maps, books and more. Contact experts for help with research. Plan a visit. Home of U.S. Copyright Office.

    • Cloudflare
    • Cloudflare DNS
    • Adobe
    • Adobe Experience Platform Tags
    • Atlassian
    • Bing Webmaster Tools

    0 say Library of Congress is a good alternative to WorldCat 0 say Library of Congress isn’t a real alternative to WorldCat

    Comment
    Close cos 0.881
12. 12
    Wikimedia movement wikimedia.org Top 1K English

    Wikimedia Error

    global social movement for free educational knowledge

    • Google Search Console
    • Google Workspace
    • Microsoft 365
    • Miro

    0 say Wikimedia movement is a good alternative to WorldCat 0 say Wikimedia movement isn’t a real alternative to WorldCat

    Comment
    Close cos 0.880
13. 13
    JSTOR jstor.org Top 10K English

    Client Challenge

    distributor of eBooks and other digital media

    • Meta Business Suite
    • Fastly
    • GlobalSign
    • Google Search Console
    • Microsoft 365
    • OpenAI

    0 say JSTOR is a good alternative to WorldCat 0 say JSTOR isn’t a real alternative to WorldCat

    Comment
    Close cos 0.880
14. 14
    Wikisource wikisource.org Top 10K English

    Wikisource

    online multilingual library that collects open-content source material

    • Google Search Console

    0 say Wikisource is a good alternative to WorldCat 0 say Wikisource isn’t a real alternative to WorldCat

    Comment
    Close cos 0.878
15. 15
    RePEc repec.org Top 10K

    RePEc: Research Papers in Economics

    RePEc is a central index of economics research, including working papers, articles and software code

    • Amazon SES
    • Apache HTTP Server
    • Google Search Console

    0 say RePEc is a good alternative to WorldCat 0 say RePEc isn’t a real alternative to WorldCat

    Comment
    Close cos 0.875
16. 16
    ORCID orcid.org Top 10K English

    ORCID

    non-profit organization that issues ORCID Identifiers

    • Cloudflare
    • Cloudflare DNS
    • Apple Business
    • Amazon Web Services
    • Google Fonts
    • Google Search Console

    0 say ORCID is a good alternative to WorldCat 0 say ORCID isn’t a real alternative to WorldCat

    Comment
    Close cos 0.873
17. 17
    Wikipedia wikipedia.org Top 100 English

    Wikipedia

    Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.

    • Google Search Console
    • Yandex Webmaster

    0 say Wikipedia is a good alternative to WorldCat 0 say Wikipedia isn’t a real alternative to WorldCat

    Comment
    Close cos 0.877
18. 18
    Wowhead wowhead.com Top 10K English

    World of Warcraft News and Guides

    The largest World of Warcraft (WoW) information site, featuring guides, news, and information on classes, gearing, professions, raids, transmog, and more.

    • OneTrust
    • Amazon CloudFront
    • Datadog RUM
    • Font Awesome
    • Google Ad Manager
    • Google Search Console

    0 say Wowhead is a good alternative to WorldCat 0 say Wowhead isn’t a real alternative to WorldCat

    Comment
    Close cos 0.875
19. 19
    International Labour Organization ilo.org Top 10K English

    ILO Homepage | International Labour Organization

    The official website of the International Labour Organization (ILO), dedicated to promoting social justice and internationally recognized human and labour rights.

    • Cloudflare
    • Cloudflare Web Analytics
    • Google Tag Manager
    • Atlassian
    • Azure DNS
    • DocuSign

    0 say International Labour Organization is a good alternative to WorldCat 0 say International Labour Organization isn’t a real alternative to WorldCat

    Comment
    Close cos 0.875
20. 20
    World Trade Organization wto.org Top 10K English

    World Trade Organization - Home page - Global trade

    Global trade - The World Trade Organization (WTO) deals with the global rules of trade between nations. Its main function is to ensure that global trade flows smoothly, predictably and freely as possible.

    • Cloudflare
    • Cloudflare DNS
    • Cloudflare Web Analytics
    • Adobe
    • Google Analytics
    • jQuery

    0 say World Trade Organization is a good alternative to WorldCat 0 say World Trade Organization isn’t a real alternative to WorldCat

    Comment
    Close cos 0.874

Ranked by score: the cosine similarity of each site’s vector to worldcat.org’s, less a small penalty for generic sites that are close to everything. Highlighted technologies are ones WorldCat uses too. Votes and comments come from visitors and don’t change the ranking.

04 · Fingerprints

Technology

What WorldCat is built with, and what its closest competitors use, from its homepage’s code and its DNS records.