| Feature | Zotero | Mendeley | EndNote Basic (EndNote Online) |
| Cost | Free basic account. Cost for additional storage. | Free basic account. Cost for additional storage. | Free basic account. |
| Website | Zotero | Mendeley | EndNote Basic - also available through Web of Science (and recommended) |
| Support | Zotero Support | Mendeley Support | EndNote Support |
| Web Based? | Yes. Standalone app with connectors for Firefox, Chrome and Safari available. | Not primarily, but syncs with an online account. | Yes. Syncs with iPad app |
| Can I work on multiple computers? | Yes | Yes | Yes |
| Can I work without an Internet connection? | Yes | Yes | No |
| Can I work on a group project or share citations? | Yes | Yes (up to 3 collaborators) | Yes |
| Word-processor Compatibility | MS Word Plugin (Win/Mac) | MS Word Plugin (Win/Mac) | MS Word Plugin |
| Open/Libre Office Plugin (Win/Mac/Linux) | Open/Libre Office Plugin (Win/Mac/Linux) | ||
| Google docs compatibility | |||
| Import from databases? | Yes | Yes | Yes |
| Import from web pages? | Yes | Yes (bookmarklet for limited number of sites) | Yes |
| Import PDF metadata? | Yes | Yes | No |
| Storage capacity | 300 MB | 5 GB | 2 GB |
| Attach files (i.e. PDFs)? | Yes | Yes | Yes |
| Create a bibliography? | Yes | Yes | Yes |
| Number of citation styles? | 8100+ (selected default styles installed, more styles can be found in the Zotero Style Repository) | 7000+ (selected deftault styles installed, more can be found at CitationStyles.org) | 3400 |