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BASE (Bielefeld Academic Search Engine) vs Open Knowledge Maps: catalog facts
BASE (Bielefeld Academic Search Engine)	Open Knowledge Maps
Free Free to search in the browser.	Free Free to use; run by a non-profit funded by supporting members.
Web	Web
Focused on open-access academic content Draws on thousands of institutional repositories	Visual overview of a research topic Very large index of open research outputs
Anti-scraper check requires modern JavaScript and can slow page loads Covers repository content, so some paywalled literature will be missing	AI mapping is still in beta Maps are built from metadata, not full text
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
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 26, 2026

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