Alternatives and competitors

Sites like DOI.org query endpoint

The 20 closest persistent identifiers alternatives to DOI.org query endpoint, ranked by what they actually offer, and the 9 technologies behind it.

Looking for an alternative to DOI.org query endpoint? The closest matches are ORCID, NIC.DO and Smithsonian Institution. We match sites by what they actually offer, from their homepages, Wikidata and a summary by Claude, in any language. Vote on each alternative and leave a short note to help the next person choose.

Neighbours: k = 20
Sites searched: 4,032
Vector: 384-d
Query: 14 ms

01 · Entity

About DOI.org query endpoint

DOI.org query endpoint doi.org

Home Page

Wikidata: API endpoint

Top 1K · #209 English 9 technologies Crawled Nov 6, 2026

Visit DOI.org query endpoint

Summary by Claude

Website of the DOI Foundation, the not-for-profit body that governs the Digital Object Identifier system (ISO 26324) and runs the resolver that redirects DOI names to the objects they identify.

Who it’s for: Publishers, registration agencies, researchers, librarians
Business model: Membership fees from registration agencies

02 · Embedding space

Competitor map

Each alternative by how close its vector is to DOI.org query endpoint’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.

similarity × popularity

03 · Nearest neighbours

Alternatives to DOI.org query endpoint

Thumbs up if it’s a real alternative to DOI.org query endpoint, thumbs down if it isn’t.

Only in English

01
ORCID orcid.org Top 10K English

ORCID

non-profit organization that issues ORCID Identifiers
Very close cos 0.908
02
NIC.DO nic.do Top 10K English

NIC.DO – .DO Domain Registration

Internet country-code top level domain for the Dominican Republic
Very close cos 0.906
03
Smithsonian Institution si.edu Top 10K English

Smithsonian request verification

group of museums and research centers administered by the United States government
Very close cos 0.903
04
Registry registry.in Top 10K English

Registry

internet country code top-level domain for India
Very close cos 0.903
05
International Organization for Standardization iso.org Top 1K English

international standards development organization
Very close cos 0.898
06
Crossref crossref.org Top 10K English

Crossref

Crossref is open infrastructure linking the world's research. 26,500 members, 171 countries, 2.1 billion monthly API queries.
Very close cos 0.895
07
ICANN icann.org Top 10K English

Internet Corporation for Assigned Names and Numbers (ICANN)

ICANN’s mission is to help ensure a stable, secure, and unified global Internet.
Very close cos 0.897
08
IETF ietf.org Top 1K English

IETF | Internet Engineering Task Force

The Internet Engineering Task Force (IETF) is the premier Internet standards body, developing open standards through open processes.
Close cos 0.894
09
United States Department of Education ed.gov Top 10K

Azure WAF

Azure WAF
Very close cos 0.897
10
United States Department of State state.gov Top 1K English

Technical Difficulties

executive department of the U.S. federal government
Very close cos 0.897
11
Dynadot dynadot.com Top 10K English

Register, Buy & Manage Domain Names Online | Dynadot

Search 800+ domain extensions, register names at transparent prices, and manage DNS, privacy, email, transfers, renewals, and domain portfolios in Dynadot.
Very close cos 0.897
12
NLnet Labs nlnetlabs.nl Top 10K English

NLnet Labs - Home

Research & Development, Internet architecture, DNS, Routing, Stability and Security.
Close cos 0.893
13
OSF osf.io Top 10K English

OSF

tools that make open science practice easier
Very close cos 0.895
14
NIC.IO nic.io Top 10K English

NIC.IO - The Official .IO Domain Registry and Network Information Centre

NIC.IO - The Official .IO Domain Registry and Network Information Centre
Close cos 0.894
15
Handle System handle.net Top 10K

Handle.Net Registry

Handle.Net Registry is a DONA MPA.
Close cos 0.889
16
Wikimedia movement wikimedia.org Top 1K English

Wikimedia Error

global social movement for free educational knowledge
Close cos 0.893
17
Zenodo zenodo.org Top 10K English

Zenodo

research data repository
Close cos 0.891
18
Register.com register.com Top 10K English

Cloudflare Captcha Page | Register.com

American domain name registrar
Close cos 0.894
19
United States Copyright Office copyright.gov Top 10K English

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

Copyright Office Homepage
Close cos 0.891
20
JSTOR jstor.org Top 10K English

Client Challenge

distributor of eBooks and other digital media
Close cos 0.891

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

04 · Fingerprints

Technology

What DOI.org query endpoint is built with, and what its closest competitors use, from its homepage’s code and its DNS records.

Built with

JavaScript libraries: jQuery asset https://www.doi.org/js/jquery-3.6.1.min.js
CSS & UI: Bootstrap asset https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js
Font Awesome asset https://www.doi.org/css/fontawesome-free-6.7.2-web/css/fontawesome.min.css
CDN: Amazon CloudFront header x-amz-cf-id: Ff4i34C2S4m7MoIsBcbrycLWLerc4iaS0s0-6FNwMPCngZxrOYi_8Q==
Cloudflare header cf-ray: a562f816ed5162e6-HAM
jsDelivr asset https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js
Email hosting: Zoho Mail MX mx.zoho.eu
Email delivery: Amazon SES TXT v=spf1 include:zohomail.eu include:cnri.net include:amazonses.com ~all
DNS hosting: Cloudflare DNS NS josh.ns.cloudflare.com

Stack changes

No changes yet. Each new crawl is compared with the last one, and what DOI.org query endpoint adds or drops shows up here.

What competitors use

Across the 20 closest sites.