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Research · head to head

Greenphire vs Zotero

Greenphire logo

Greenphire

Research

Clinical trial participant payments, reimbursement and travel, now part of Suvoda

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: Greenphire the standalone greenphire.com site now redirects to Suvoda and the brands have been integrated, so buyers are contracting with a randomisation and supply vendor and should expect cross selling rather than an independent payments specialist.; 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 Greenphire and Zotero actually diverge.

Attributes where Greenphire and Zotero differ
AttributeGreenphireZotero
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 Greenphire

  • ClinCard
  • Direct to bank payment
  • Expense reimbursement
  • Travel and logistics
  • Site payments
  • Budgeting and benchmarking
  • Tax handling

Only in Zotero

Nothing recorded that Greenphire does not also cover.

What people use each for

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

Greenphire

  • A global Phase III trial paying stipends across many countries where participants cannot practically be reimbursed by sponsor accounts payablenot Zotero
  • A decentralised or hybrid trial where participants travel long distances and the sponsor funds flights and accommodationnot Zotero
  • A trial in a population where slow reimbursement drives dropout and same day payment materially helps retentionnot Zotero
  • A sponsor that wants site payment milestones and participant payments handled by one vendor rather than twonot Zotero

Zotero

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

Where each one falls short

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

Greenphire

  • The standalone greenphire.com site now redirects to Suvoda and the brands have been integrated, so buyers are contracting with a randomisation and supply vendor and should expect cross selling rather than an independent payments specialist.
  • Nothing is published on price, and the typical shape of a platform fee plus per participant and per transaction charges means the cost of a trial is not knowable until enrolment is known.
  • Payment method availability varies sharply by country, so a global protocol may end up with card payments in some regions and slow manual processes in others, which undermines the retention argument that justified the purchase.
  • Sites bear the administrative work of enrolling participants and triggering payments but are not the buyer, so adoption depends on the sponsor mandating it and site resistance is a real implementation risk.
  • Participant payments create tax reporting obligations that differ per jurisdiction, and the tooling helps but does not remove sponsor liability, so legal and finance review is required in every country the trial runs in.

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

Greenphire

On request
  • Greenphire Patient Payments$undefined/year
    • Priced per study through a sales process
    • Typically a platform fee plus per participant and per transaction charges
    • Funding of the payment float is separate from the software fee

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 Greenphire if

  • You need clincard.
  • You work on Web, iOS, Android.
  • You also want direct to bank payment.
Greenphire review

Choose Zotero if

  • You want to start without paying.
Zotero review

Questions people ask

Is Greenphire or Zotero better?
Neither clearly leads. Greenphire 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, Greenphire or Zotero?
Zotero has a free tier; the other does not. Paid plans start at On request for Greenphire and Free for Zotero.
Does Greenphire or Zotero run on more platforms?
Greenphire 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. Greenphire starts at On request.
What is Greenphire best used for?
Greenphire is most often used for a global phase iii trial paying stipends across many countries where participants cannot practically be reimbursed by sponsor accounts payable, a decentralised or hybrid trial where participants travel long distances and the sponsor funds flights and accommodation, a trial in a population where slow reimbursement drives dropout and same day payment materially helps retention, a sponsor that wants site payment milestones and participant payments handled by one vendor rather than two. Of those, a global phase iii trial paying stipends across many countries where participants cannot practically be reimbursed by sponsor accounts payable and a decentralised or hybrid trial where participants travel long distances and the sponsor funds flights and accommodation are not what Zotero is typically brought in for.
What can Greenphire do that Zotero cannot?
Greenphire covers ClinCard, Direct to bank payment, Expense reimbursement, Travel and logistics.

Answered from the vendors’ own pages

Greenphire: Is Greenphire still sold?

Yes, as Greenphire Patient Payments on the Suvoda platform. The independent website and social presence have been consolidated into Suvoda.

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
Greenphire: What is ClinCard?

The reloadable debit card Greenphire issues to participants. Greenphire Patient Payments was formerly known as ClinCard.

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
Greenphire: Does it publish pricing?

No. Pricing is per study and quoted through sales, and funding the payments themselves is separate from the software fee.

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
Greenphire: Can it pay participants outside the United States?

Yes, in more than thirty currencies, but the available payment method depends on the country.

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