| Developer | RefWorks | Elsevier | Centre for History and New Media at GMU | 
		
			| Cost | Not free (SPC No Longer has Subscription) | Free | Free | 
		
			| Access | Desktop applications. Web-based applications | Desktop applications. Web-based applications | Firefox Add-on. Desktop Application through Standalone application on Internet Explorer or Chrome | 
		
			| Must be online? | Yes | No | No | 
		
			| Import from databases | Direct export from specific databases | Yes, with Mendelay import browser plugin | Yes | 
		
			| Export | RefWorks format, RIS bibliographic software | BibTex, EndNote (XML), RIS | BibTex, RIS, Refer/BiblX, Bibliontology, MODS | 
		
			| How does it work? | Export references from compatible databases into RefWorks | Export references from compatible databases into Mendeley | Click on item records to add to your Zotero references/collections | 
		
			| Import citation information from web pages | Yes, with RefGrab-It | Yes, with Mendeley Import browser plugin. Also archives the page and allows annotations | Yes. Also archives the page and allows annotations | 
		
			| Cross-platform syncing across desktop, web and mobile devices | No | Yes | Yes | 
		
			| Attach and organise associated files eg PDFs | Yes (limited) | Yes, and can annotate and highlight | Yes, with option to annotate automatically; annotate and highlight | 
		
			| Screen capture web page content eg blogs, videos | No | Yes | Yes | 
		
			| Extract DOIs (Digital Object Identifiers) | Yes | Yes | Yes | 
		
			| Full-text searching across PDFs | No | Yes | Yes: not enabled by default | 
		
			| Tagging | Yes (keywords) | Yes | Yes | 
		
			| Add notes to references | Yes: in 'notes' or 'user' fields | Yes: in 'notes' tab on desktop | Yes | 
		
			| Citation PlugIns for Word | Yes | Yes | Yes | 
		
			| Word Processor compatibility | MS Word with Write-N-Cite | MS Word, Open Office | MS Word, Open Office, Google Docs | 
		
			|  |  |  |  | 
		
			| Duplicate detection | Yes | Yes | Yes. Limited | 
		
			| Create bibliography with different styles | Yes | Yes | Yes | 
		
			| Edit or create citation styles | Yes | Yes | Yes: via Citation Style Editor | 
		
			| Private Groups | Yes but other users cannot add more references | Yes: small groups up to 3 are free. Costs for larger groups | Yes | 
		
			| Public Groups | No | Yes | Yes | 
		
			| Sharing References | Others can be invited to view references | Others can be invited to share and view references | Others can be invited to share and view references | 
		
			| Storage Capacity | Default is 100MB per user. Can be increased to 5GB: limit of 20MB per attachment | Unlimited local storage and data syncing. 1 GB free mendeley web space. More space can be purchased | Unlimited local storage and data syncing. 100MB free Zotero web space. More space can be purchased. | 
		
			| Mobile app | Yes. RefMobile (mobile and smart phones, PDAs) | Yes. iPad, iPhone, 3rd party Android apps, web interface | Yes.3rd party IOS and Android apps, web interface | 
		
			| Open Source | No | No | Yes | 
		
			| Other features | 
				Access for web-connected mobile devices at www.refworks.com/mobileAllows users to share citationsGood for organising citations for papersWeb-based so you are not limited to a single machine | 
				Sync My Library with multiple computers. Use tags to organise/searchGreat for managing PDFs; enables highlighting and comments on PDFsHas a social aspect: you can see what other users are readingPulls citation metadata from PDFsShare citations and documents with others | 
				Sync My Library with multiple computers. Use tags to organise/searchSimple download of recordsGood for managing a variety of formats, including webpagesIntegrated with work you do on the web | 
		
			|  |  |  |  |