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BASE (Bielefeld Academic Search Engine)PubMed
Free

Free to search in the browser.

 Free

Free to use, run by a US government agency.

Web Web
  • Focused on open-access academic content
  • Draws on thousands of institutional repositories
  • Over 40 million biomedical citations in one place
  • Advanced search, clinical queries and MeSH browsing
  • Anti-scraper check requires modern JavaScript and can slow page loads
  • Covers repository content, so some paywalled literature will be missing
  • Mostly citations and abstracts; full text depends on PubMed Central or publishers
  • Limited to biomedical and life-sciences subjects
Web application Web application
Closed source Closed source
License not stated License not stated
Not stated if an account is needed No account needed
Needs internet Needs internet

Checked October 2, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.