✓
Tool
Category
Pricing
Free?
Updated
CORE
AI Research
Free
✓
Mar 2026
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World's largest open access paper aggregator with 250M+ records and text mining API.
Best for: open-access
Unpaywall
AI Research
Free
✓
Mar 2026
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Free browser extension that finds legal open access versions of paywalled papers.
Best for: open-access
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
ResearchRabbit ✓
AI Research
Free
✓
Mar 2026
→
Free personalized research paper discovery with visual networks and new paper alerts.
Best for: research
Zotero ✓
AI Research
Free
✓
Mar 2026
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Free open-source reference manager with browser extension, annotations, and Word integration.
Best for: reference-manager
Google Scholar ✓
AI Research
Free
✓
Mar 2026
→
Free Google search engine for scholarly articles, theses, books, and patents worldwide.
Best for: research
Inciteful
AI Research
Free
✓
Mar 2026
→
Free citation network analysis tool for rapid literature review and paper discovery.
Best for: research
OpenAlex
AI Research
Free
✓
Mar 2026
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Free open catalog of 250M+ scholarly works with open API and data snapshots.
Best for: research
PubMed AI ✓
AI Research
Free
✓
Mar 2026
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AI-enhanced biomedical literature search built on the PubMed database by NCBI.
Best for: biomedical
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
Kopernio
AI Research
Free
✓
Mar 2026
→
Clarivate browser extension for one-click PDF access to research papers via library links.
Best for: browser-extension