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Crossref

Crossref · Research dissemination

Membership organization that registers DOIs for scholarly content and exposes the metadata through a free public REST API, content negotiation and the paid Metadata Plus service

ProprietaryFreePaidNov 2, 2026

scite

Scite LLC (Research Solutions) · Literature discovery & review

Citation-analysis platform whose Smart Citations show whether later papers support, contrast or merely mention a claim, with an AI assistant and reference checking

ProprietaryFreemiumPaidNov 2, 2026

Semantic Scholar

Allen Institute for AI (Ai2) · Literature discovery & review

Free AI-assisted literature search from Ai2 with an Academic Graph API, recommendations and downloadable datasets of papers, authors and citations

ProprietaryFreeNov 2, 2026

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