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Research · head to head

Castor EDC vs Zotero

Castor EDC logo

Castor EDC

Research

Electronic data capture and eConsent for clinical trials, built for investigator-initiated studies as well as sponsors

From
On request
Rated
-
Full reviewWebsite
Zotero logo

Zotero

Research

Collect, organize, annotate, cite and share your research

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Zotero has a free tier, so it costs nothing to try first.
  • Each has a real cost: Castor EDC nothing is published: pricing is quoted only after a scoping call and protocol review, so budgeting a grant application means asking for a quote months before the study is funded and hoping the scope holds.; 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 31 August 2026.

Where they differ

Only the attributes on which Castor EDC and Zotero actually diverge.

Attributes where Castor EDC and Zotero differ
AttributeCastor EDCZotero
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWeb, iOS, AndroidWeb

Identical on both: user rating (Not yet rated), category (Research).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Castor EDC

  • Browser-based study build
  • 21 CFR Part 11 workflows
  • eConsent
  • ePRO and surveys
  • Randomisation
  • Per-study licensing
  • Grant-funded pricing paths
  • Data export

Only in Zotero

Nothing recorded that Castor EDC does not also cover.

What people use each for

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

Castor EDC

  • An academic hospital running an investigator-initiated trial that cannot fund a sponsor-grade EDC contract or a data management CROnot Zotero
  • A medical device company collecting post-market clinical follow-up data with Part 11 audit trailsnot Zotero
  • A multi-site registry that needs remote eConsent because participants are recruited nationally rather than at a clinicnot Zotero
  • A biotech running a small phase two study that wants the database built by its own clinical team in weeks rather than commissionednot Zotero

Zotero

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

Where each one falls short

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

Castor EDC

  • Nothing is published: pricing is quoted only after a scoping call and protocol review, so budgeting a grant application means asking for a quote months before the study is funded and hoping the scope holds.
  • Price scales on protocol complexity rather than a simple unit, so two studies with the same participant count can be quoted very differently and there is no public benchmark to argue against.
  • Modules such as eConsent, ePRO and randomisation are quoted on top of the base platform, so the headline EDC figure is rarely the number that appears on the final proposal.
  • It is deliberately lighter than the full sponsor suites, so a study that grows into a global registrational programme needing integrated CTMS, safety, IRT and full trial supply management will need additional systems and the interfaces between them.
  • Regulatory responsibility does not transfer with the software: the platform supports Part 11 compliant workflows, but system validation for your intended use, SOPs and audit readiness remain your obligation and your cost, which sponsors new to EDC consistently underestimate.

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

Castor EDC

On request
  • Castor EDC$undefined/year
    • Priced per study on protocol complexity, duration, sites and modules
    • 21 CFR Part 11 and ICH GCP workflows
    • eConsent, ePRO and randomisation modules quoted separately

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 Castor EDC if

  • You need browser-based study build.
  • You work on Web, iOS, Android.
  • You also want 21 cfr part 11 workflows.
Castor EDC review

Choose Zotero if

  • You want to start without paying.
Zotero review

Questions people ask

Is Castor EDC or Zotero better?
Neither clearly leads. Castor EDC starts at On request and Zotero at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Castor EDC or Zotero?
Zotero has a free tier; the other does not. Paid plans start at On request for Castor EDC and Free for Zotero.
Does Castor EDC or Zotero run on more platforms?
Castor EDC runs on Web, iOS, Android. Zotero runs on Web.
Can I use Zotero for free?
Yes. Zotero has a free tier, so you can try it without paying. Castor EDC starts at On request.
What is Castor EDC best used for?
Castor EDC is most often used for an academic hospital running an investigator-initiated trial that cannot fund a sponsor-grade edc contract or a data management cro, a medical device company collecting post-market clinical follow-up data with part 11 audit trails, a multi-site registry that needs remote econsent because participants are recruited nationally rather than at a clinic, a biotech running a small phase two study that wants the database built by its own clinical team in weeks rather than commissioned. Of those, an academic hospital running an investigator-initiated trial that cannot fund a sponsor-grade edc contract or a data management cro and a medical device company collecting post-market clinical follow-up data with part 11 audit trails are not what Zotero is typically brought in for.
What can Castor EDC do that Zotero cannot?
Castor EDC covers Browser-based study build, 21 CFR Part 11 workflows, eConsent, ePRO and surveys.

Answered from the vendors’ own pages

Castor EDC: Is there a free academic version?

No published free tier. There are academic, non-profit and grant-funded pricing paths, but each is quoted rather than self-service.

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
Castor EDC: Is it 21 CFR Part 11 compliant?

It supports Part 11 compliant workflows with audit trails and electronic signatures. Validating the system for your specific use remains your responsibility.

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
Castor EDC: Do I need a programmer to build a study?

No. Case report forms are configured in the browser, which is the main reason academic groups adopt it.

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
Castor EDC: How long does a quote take?

Castor states a full pricing proposal within five business days of sharing the protocol.

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