✓
Tool
Category
Pricing
Free?
Updated
Keenious
AI Research
Freemium
✓
Mar 2026
→
AI that recommends relevant research articles based on your writing and notes.
Best for: research
PDF.ai
AI Research
Freemium
✓
Mar 2026
→
AI PDF tool for chatting, data extraction, and summarization with source highlights.
Best for: PDF
BASE Search
AI Research
Free
✓
Mar 2026
→
Academic search engine indexing 300M+ open access documents from 10,000+ providers.
Best for: research
CORE
AI Research
Free
✓
Mar 2026
→
World's largest open access paper aggregator with 250M+ records and text mining API.
Best for: open-access
Unpaywall
AI Research
Free
✓
Mar 2026
→
Free browser extension that finds legal open access versions of paywalled papers.
Best for: open-access