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Research · head to head

Mendeley vs Zotero

Mendeley logo

Mendeley

Research

The free all-in-one reference manager

From
Free
Rated
-
Full reviewWebsite
Zotero logo

Zotero

Research

Collect, organize, annotate, cite and share your research

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Mendeley free tier limited to 5 Reading Assistant questions per month and 2GB storage; Zotero free account storage is limited; paid tiers start at $20/year for 2GB and reach $120/year for unlimited storage
  • Prices and features above were last checked on 28 August 2026.

Where they differ

Only the attributes on which Mendeley and Zotero actually diverge.

Attributes where Mendeley and Zotero differ
AttributeMendeleyZotero

Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), platforms (Web), user rating (Not yet rated), category (Research).

What people use each for

The jobs each tool is most often brought in to do.

Mendeley

  • Storing and organizing large research librariesnot Zotero
  • Searching and querying PDFs in librarynot Zotero
  • Uncovering patterns and connections across referencesnot Zotero
  • Comparing experimental data across multiple studiesnot Zotero

Zotero

  • Research paper and citation managementnot Mendeley
  • Academic bibliography organizationnot Mendeley
  • Cross-device synchronization of research materialsnot Mendeley

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Mendeley

  • Free tier limited to 5 Reading Assistant questions per month and 2GB storage
  • Annual billing required to receive one free month equivalent discount
  • Storage limits restricted on Plus (5GB) and Pro (10GB) tiers

Zotero

  • Free account storage is limited; paid tiers start at $20/year for 2GB and reach $120/year for unlimited storage
  • Sync and web access are optional add-ons layered on the core desktop app rather than included outright

Pricing, plan by plan

Mendeley

Free
  • FreeFree
    • 2GB storage
    • 5 Reading Assistant questions per month
  • Plus$4.99/month
    • Unlimited Reading Assistant
    • 5GB storage
    • $55/year annual billing
  • Pro$9.99/month
    • Unlimited Reading Assistant
    • Compare Experiments
    • Ask My Library
  • Max$14.99/month
    • Unlimited Reading Assistant
    • Compare Experiments
    • Ask My Library

Zotero

Free
  • FreeFree
    • 300 MB storage
    • Collaboration features at no cost
    • Group libraries for team use
  • 2 GB Storage$20/year
    • 2 GB storage
    • Synchronization of PDFs, images, web snapshots across devices
  • 6 GB Storage$60/year
    • 6 GB storage
    • Synchronization across all devices
  • Unlimited Storage$120/year
    • Unlimited storage
    • Full synchronization capabilities

Which should you pick?

Choose Mendeley if

  • You want to start without paying.
Mendeley review

Choose Zotero if

  • You want to start without paying.
Zotero review

Questions people ask

Is Mendeley or Zotero better?
Neither clearly leads. Mendeley starts at Free and Zotero at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mendeley or Zotero?
Mendeley starts at Free and Zotero at Free.
Does Mendeley or Zotero run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Mendeley for free?
Both have a free tier, so you can try either at no cost before committing.
What is Mendeley best used for?
Mendeley is most often used for storing and organizing large research libraries, searching and querying pdfs in library, uncovering patterns and connections across references, comparing experimental data across multiple studies. Of those, storing and organizing large research libraries and searching and querying pdfs in library are not what Zotero is typically brought in for.

Answered from the vendors’ own pages

Mendeley: How much does Mendeley Premium cost?

Mendeley Plus costs $4.99 per month or $55 per year. Pro tier costs $9.99 per month or $110 per year. Max tier costs $14.99 per month or $165 per year. All annual plans include one free month of service.

Source
Zotero: How much storage does Zotero's free tier provide?

The free tier includes 300 MB of storage for research materials, citations, and related files. Collaboration features in group libraries are available at no additional cost.

Source
Mendeley: Is there a free version of Mendeley?

Yes, Mendeley offers a free tier with 2GB of storage and 5 Reading Assistant questions per month. No credit card is required for the free plan.

Source
Zotero: What are the pricing tiers for Zotero paid storage plans?

Zotero offers three paid storage tiers: 2 GB for $20 per year ($1.67 monthly), 6 GB for $60 per year ($5 monthly), and Unlimited storage for $120 per year ($10 monthly).

Source
Mendeley: What storage do different Mendeley plans include?

The free tier includes 2GB storage. Plus tier provides 5GB storage. Pro tier includes 10GB storage. Max tier offers unlimited storage across all your research libraries.

Source
Zotero: Do group libraries count against storage limits in Zotero?

Group library file storage draws from the group owner's personal storage account, not a separate quota. Collaboration in group libraries is available at no additional charge.

Source
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