Sites like ClinicalTrials.gov

01 · Entity

About ClinicalTrials.gov

ClinicalTrials.gov clinicaltrials.gov

ClinicalTrials.gov

Wikidata: United States government registry of clinical trials

Top 10K · #3,641 English 4 technologies Crawled Nov 6, 2026

Visit ClinicalTrials.gov

Summary by Claude

A public database of privately and publicly funded clinical studies worldwide, run by the U.S. National Library of Medicine, where users can search trial registrations, eligibility criteria, locations and posted results, and sponsors can register studies.

Who it’s for

Patients, clinicians, researchers, trial sponsors

Business model

Government funded

• clinical trials registry
• clinical trial search
• study registration
• trial results database
• recruiting studies
• eligibility criteria
• NCT number lookup
• PRS sponsor submission

02 · Embedding space

Competitor map

Each alternative by how close its vector is to ClinicalTrials.gov’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.

We can’t read clinicaltrials.gov’s homepage (too little text on the homepage), so it’s compared on what Wikidata and Wikipedia say about it.

1. 01
   nih.gov Top 1K English

   US government medical research agency

   • Google Search Console
   • Adobe
   • Apple Business
   • Atlassian
   • Cloudflare
   • DocuSign

   0 say nih.gov is a good alternative to ClinicalTrials.gov 0 say nih.gov isn’t a real alternative to ClinicalTrials.gov

   Comment
   Very close cos 0.919
2. 02
   MedlinePlus medlineplus.gov Top 10K English

   MedlinePlus - Health Information from the National Library of Medicine

   Find information on health conditions, wellness issues, and more in easy-to-read language on MedlinePlus, the up-to-date, trusted health information site from the NIH and the National Library of Medicine.

   • Google Search Console
   • Amazon Web Services
   • Bing Webmaster Tools
   • Amazon CloudFront
   • Google Tag Manager
   • jQuery

   0 say MedlinePlus is a good alternative to ClinicalTrials.gov 0 say MedlinePlus isn’t a real alternative to ClinicalTrials.gov

   Comment
   Very close cos 0.915
3. 03
   Europe PubMed Central europepmc.org Top 10K English

   database of biomedical research

   • Cloudflare
   • Amazon Route 53

   0 say Europe PubMed Central is a good alternative to ClinicalTrials.gov 0 say Europe PubMed Central isn’t a real alternative to ClinicalTrials.gov

   Comment
   Very close cos 0.908
4. 04
   National Cancer Institute cancer.gov Top 10K English

   Comprehensive Cancer Information - NCI

   Accurate, up-to-date, comprehensive cancer information from the U.S. government's principal agency for cancer research.

   • Google Fonts
   • Google Search Console
   • Adobe Experience Platform Tags
   • Drupal
   • Meta Business Suite
   • nginx

   0 say National Cancer Institute is a good alternative to ClinicalTrials.gov 0 say National Cancer Institute isn’t a real alternative to ClinicalTrials.gov

   Comment
   Very close cos 0.906
5. 05
   medRxiv medrxiv.org Top 10K English

   medRxiv.org - the preprint server for Health Sciences

   medRxiv - the preprint server for biology, operated by openRxiv, a nonprofit organization dedicated to advancing scientific communication

   • Google Search Console
   • Cloudflare
   • Cloudflare DNS
   • Drupal
   • Font Awesome
   • Google Analytics

   0 say medRxiv is a good alternative to ClinicalTrials.gov 0 say medRxiv isn’t a real alternative to ClinicalTrials.gov

   Comment
   Very close cos 0.903
6. 06
   CDC cdc.gov Top 1K English

   Centers for Disease Control and Prevention | CDC

   United States government public health agency

   • Google Search Console
   • Adobe
   • Akamai Edge DNS
   • Apple Business
   • Atlassian
   • Azure Front Door

   0 say CDC is a good alternative to ClinicalTrials.gov 0 say CDC isn’t a real alternative to ClinicalTrials.gov

   Comment
   Very close cos 0.896
7. 07
   Psychology Today psychologytoday.com Top 10K English

   Psychology Today: Health, Help, Happiness + Find a Therapist

   View the latest from the world of psychology: from behavioral research to practical guidance on relationships, mental health and addiction. Find help from our directory of therapists, psychologists and counselors.

   • Google Search Console
   • Bing Webmaster Tools
   • CookieYes
   • Drupal
   • Google Ad Manager
   • Google Tag Manager

   0 say Psychology Today is a good alternative to ClinicalTrials.gov 0 say Psychology Today isn’t a real alternative to ClinicalTrials.gov

   Comment
   Very close cos 0.895
8. 08
   National Academies nationalacademies.org Top 10K English

   National Academies of Sciences, Engineering, and Medicine

   Our work helps shape sound policies, inform public opinion, and advance the pursuit of science, engineering, and medicine.

   • Google Search Console
   • Akamai
   • Akamai Edge DNS
   • Google Tag Manager
   • HubSpot
   • Mailchimp

   0 say National Academies is a good alternative to ClinicalTrials.gov 0 say National Academies isn’t a real alternative to ClinicalTrials.gov

   Comment
   Close cos 0.893
9. 09
   Mayo Clinic mayoclinic.org Top 1K

   medical practice and medical research group based in Rochester, Minnesota, United States

   • Google Search Console
   • Akamai
   • Akamai Edge DNS
   • Apple Business
   • Meta Business Suite

   0 say Mayo Clinic is a good alternative to ClinicalTrials.gov 0 say Mayo Clinic isn’t a real alternative to ClinicalTrials.gov

   Comment
   Close cos 0.892
10. 10
    EBSCO Information Services ebsco.com Top 10K English

    EBSCO - Research Databases, EBooks, Discovery Service

    EBSCO is the leading provider of research databases, e-journals, magazine subscriptions, ebooks and discovery service for academic libraries, public libraries, corporations, schools, government and medical institutions

    • Google Search Console
    • Amazon SES
    • Atlassian
    • Amazon CloudFront
    • Microsoft 365
    • Miro

    0 say EBSCO Information Services is a good alternative to ClinicalTrials.gov 0 say EBSCO Information Services isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.890
11. 11
    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.

    • Google Search Console
    • Cloudflare
    • Cloudflare DNS
    • Cloudflare Web Analytics
    • Google Tag Manager
    • Google Workspace

    0 say Our World in Data is a good alternative to ClinicalTrials.gov 0 say Our World in Data isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.892
12. 12
    United States Congress congress.gov Top 10K English

    bicameral legislature of the United States

    • Google Search Console
    • Cloudflare
    • Cloudflare DNS

    0 say United States Congress is a good alternative to ClinicalTrials.gov 0 say United States Congress isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.892
13. 13
    Pew Research Center pewresearch.org Top 10K English

    Pew Research Center | Nonpartisan, nonadvocacy, public opinion polling and data-driven social science research

    Numbers, Facts and Trends Shaping Your World

    • Google Search Console
    • Adobe
    • Adobe Fonts
    • Apple Business
    • DocuSign
    • Firebase

    0 say Pew Research Center is a good alternative to ClinicalTrials.gov 0 say Pew Research Center isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.890
14. 14
    National Archives and Records Administration archives.gov Top 10K English

    National Archives | Home

    National Archives and Records Administration

    • Google Fonts
    • Google Search Console
    • Bootstrap
    • Amazon CloudFront
    • Google Tag Manager
    • jQuery

    0 say National Archives and Records Administration is a good alternative to ClinicalTrials.gov 0 say National Archives and Records Administration isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.891
15. 15
    CNRS cnrs.fr Top 10K English

    Centre national de la recherche scientifique (CNRS)

    Le Centre national de la recherche scientifique est le plus grand organisme public français de recherche scientifique. Il exerce son activité dans

    • Google Search Console
    • Drupal
    • jQuery
    • Matomo
    • Microsoft 365
    • PHP

    0 say CNRS is a good alternative to ClinicalTrials.gov 0 say CNRS isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.888
16. 16
    Federal Register federalregister.gov Top 10K

    official journal of the U.S. Federal Government

    0 say Federal Register is a good alternative to ClinicalTrials.gov 0 say Federal Register isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.889
17. 17
    NSF nsf.gov Top 10K English

    NSF - U.S. National Science Foundation

    NSF is an independent federal agency that supports science and engineering in all 50 states and U.S. territories.

    • Google Search Console
    • Adobe
    • Amazon SES
    • Apache HTTP Server
    • Atlassian
    • Amazon CloudFront

    0 say NSF is a good alternative to ClinicalTrials.gov 0 say NSF isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.888
18. 18
    www.nhs.uk Top 10K English

    NHS website for England - NHS

    Find information and services to help you manage your health.

    • Google Search Console
    • Adobe Experience Platform Tags
    • Akamai Bot Manager
    • Azure Front Door

    0 say www.nhs.uk is a good alternative to ClinicalTrials.gov 0 say www.nhs.uk isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.886
19. 19
    Healthline healthline.com Top 10K English

    Healthline: Medical information and health advice you can trust.

    We're committed to being your source for expert health guidance. Come to us in your pursuit of wellness.

    • Google Search Console
    • Adobe
    • Apple Business
    • Atlassian
    • Amazon CloudFront
    • Comscore

    0 say Healthline is a good alternative to ClinicalTrials.gov 0 say Healthline isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.889
20. 20
    JSTOR jstor.org Top 10K English

    Client Challenge

    distributor of eBooks and other digital media

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

    0 say JSTOR is a good alternative to ClinicalTrials.gov 0 say JSTOR isn’t a real alternative to ClinicalTrials.gov

    Comment
    Close cos 0.887

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

04 · Fingerprints

Technology

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