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| Spec | Encyclopaedia Britannica | Wikipedia | Zotero |
|---|---|---|---|
| Category | Education & Learning | Education & Learning | Education & Learning |
| Pricing | Free articles + Premium | Free | Free + optional paid storage |
| Rating | 4.7 (38,000) | 4.7 (120,000) | 4.8 (9,800) |
| Community | 92/100 | 96/100 | 95/100 |
| Tier | featured | featured | featured |
| Best for | encyclopedia, reference, research, articles | encyclopedia, reference, free, research | research, citations, bibliography, open-source |
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