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| Basic software package (includes all features listed below) |
Free |
$250 |
$100 |
Free |
$79 |
| Free web storage space (online backup of your papers) |
2GB |
1GB |
NA |
100MB |
NA |
| Reference/Document Management |
| Organization of PDFs and other documents |
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| Citation Plug-ins for Word |
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| Citation Plug-ins for Open Office |
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| Annotations/Highlighting in PDFs |
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| Cross-platform synching across desktop, web and mobile devices |
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| Knowledge Discovery |
| Free and open database approaching 100 million documents |
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| Personalized paper recommendations |
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| Readership statistics & community tags |
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| Open Web API |
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| Full text search across all your papers |
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| Search across external databases |
Almost there! |
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Collaboration |
| Private groups |
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| Public groups |
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| Social network |
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| Collaboration newsfeed |
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| General Technology |
| Web app |
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| Desktop app |
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| Compatibility with all modern web browsers |
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| Compatibility with Mac/Win/Linux |
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| Mobile & iPad |
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| Product feedback forum |
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| Library systems integration/EZProxy Support |
Almost there! |
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| Metadata Extraction Technology |
| Extraction of DOIs (Digital Object Identifiers) from PDFs |
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| Extraction of PubmedIDs and ArxivIDs from PDFs |
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| Extraction of embedded metadata from PDFs |
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| Extraction of citation details from PDFs without embedded metadata |
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