✓
Tool
Category
Pricing
Free?
Updated
Semantic Scholar ✓
AI Research
Free
✓
Mar 2026
→
Free AI academic search with 200M+ papers, TLDR summaries, and citation graphs.
Best for: research
Connected Papers ✓
AI Research
Freemium
✓
Mar 2026
→
Visual graph explorer that maps related papers based on similarity, not just citations.
Best for: research
Zotero ✓
AI Research
Free
✓
Mar 2026
→
Free open-source reference manager with browser extension, annotations, and Word integration.
Best for: reference-manager
SciSpace ✓
AI Research
Freemium
✓
Mar 2026
→
AI copilot for understanding research papers with explanations and literature review tools.
Best for: research
Google Scholar ✓
AI Research
Free
✓
Mar 2026
→
Free Google search engine for scholarly articles, theses, books, and patents worldwide.
Best for: research
ChatDoc
AI Research
Freemium
✓
Mar 2026
→
AI file reading assistant with OCR, table understanding, and multi-format support.
Best for: PDF