Citation Tools

Cost

Free. Additional
storage for a fee

Free. Additional
storage for a fee

Student pricing

Free for NPS users 
through Web of Science

Free for NPS
users

Support

• Library supported with workshops and a guide
• Excellent documentation
• Self-help through user forums

• Not library supported
• Good documentation
• Self-help through user forums
• Customer support via email

• Not library supported
• Excellent documentation
• Self-help through user forums
• Customer support via email and phone

• Not library supported
• Adequate documentation
• Customer support via email and phone

• Not library supported
• Adequate  documentation
• Customer support via email and phone

Access

Web

Web and desktop

Web and desktop

Web

Web

Storage

300 MB free, pay for more

2 GB free, pay for more

Unlimited

2 GB

Unlimited

Annotate &
Highlight PDFs

Not within Zotero, but can annotate in 3rd party software such as Adobe Reader or Acrobat Pro

Yes

Yes

No

Yes

PDF Metadata
Scraped

Yes

Yes

Yes

No

Yes

Collaboration

Public and private groups

Public and private groups

Shared libraries

Shared groups

Shared folders

Citation Styles
Supported

Style repository

Find and edit styles

Output styles

3300+

Output styles

Quick Start Info

Quick start guide

Help guides

• Getting started guide (Windows)
• Quick reference guide PDF (Windows)
• Getting started guide (Mac)
• Quick reference guide PDF (Mac)

Quick reference guide

Quick start guide