Citation Tools

Chart comparing some of the common reference management tools
 

Zotero

Refworks 

Mendeley

EndNote Online
Premium

EndNote

Cost

Free, additional
storage for a fee
Free for NPS
users
Free, additional
storage for a fee
Free for NPS users 
through Web of Science
Student pricing

Support

Excellent
documentation. 
Self-help
through user forums.
Excellent documentation
and customer support by
email and phone.
Good
documentation.
Self-help through
user forums and
customer support by email.
Adequate
documentation.
Phone and email support.
Exellent
documentation.
Self-help through
user forums and
customer support by email and phone.

Access

Web Web Web and desktop Web Web and desktop

Storage

300 MB free, pay for more Unlimited 2 GB free, pay for more 2 GB Unlimited

Annotate &
Highlight PDFs?

Not within Zotero, but can annotate in external viewer. Yes Yes No Yes

PDF Metadata
Scraped?

Yes Yes Yes No Yes

Collaboration 
Support

Public and private groups Shared folders Public and private groups Shared groups Shared libraries

Citation Styles
Supported

Style repository Output styles Find and edit styles 3300+ Output styles

Quick Start Info

Quick start guide Support table of contents
Guide
Help guides Quick reference guide Getting started guide
(Windows)
Quick reference guide pdf (Windows)
Getting started guide (Mac)
Quick reference guide pdf (Mac)