Unpaywall vs CORE
AI Research tools comparison · Updated 2026
Choosing between Unpaywall and CORE? Both are popular AI Research tools. Unpaywall is free to use and focuses on Browser extension. CORE is free to use and specializes in 250M+ metadata records. Here's a detailed side-by-side comparison to help you decide.
At a Glance
Feature Comparison
| Unpaywall | CORE |
|---|---|
| ✓ Browser extension | ✓ 250M+ metadata records |
| ✓ Open access detection | ✓ Full-text access |
| ✓ 50,000+ source repositories | ✓ Open access aggregation |
| ✓ DOI-based lookup | ✓ API for text mining |
| ✓ Green lock indicator | ✓ Dataset services |
| ✓ API access | ✓ Repository dashboard |
Pricing Comparison
Unpaywall
freeCompletely free browser extension. Data feed available for institutions.
CORE
freeFree for individuals. API access free for research. Commercial API licensing available.
Pros & Cons
Unpaywall
Pros
- Completely free
- Works automatically while browsing
- Legal open access only
- Simple one-click access
Cons
- Only finds already-open papers
- Not all papers have OA versions
- Browser extension only
- No search functionality
CORE
Pros
- Largest open access collection
- Full-text availability
- Free API for research
- Great for text mining
Cons
- Interface not very modern
- Duplicate records possible
- Search relevance can be poor
- Full-text not always available
The Verdict
Both Unpaywall and CORE are strong AI Research tools. Unpaywall stands out for Completely free, making it ideal if that's your priority. CORE excels at Largest open access collection, which may be more important for your workflow.
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