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CORE
AI Research
Free
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Mar 2026
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World's largest open access paper aggregator with 250M+ records and text mining API.
Best for: open-access
BASE Search
AI Research
Free
✓
Mar 2026
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Academic search engine indexing 300M+ open access documents from 10,000+ providers.
Best for: research
Semantic Scholar ✓
AI Research
Free
✓
Mar 2026
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Free AI academic search with 200M+ papers, TLDR summaries, and citation graphs.
Best for: research