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Research · head to head

Attest vs Castor EDC

Attest logo

Attest

Research

Straightforward pricing for predictable research costs

From
On request
Rated
-
Full reviewWebsite
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

The short version

  • Each has a real cost: Attest pricing is metered by credits, where one credit equals one survey question answered by one person, rather than a flat per seat rate; 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.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

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

Attributes where Attest and Castor EDC differ
AttributeAttestCastor EDC
Pricing modelsubscriptionquote
PlatformsWebWeb, iOS, Android

Identical on both: starting price (On request), free tier (No), 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 Attest

Nothing recorded that Castor EDC does not also cover.

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

What people use each for

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

Attest

  • Testing product concepts with global audiencesnot Castor EDC
  • Monitoring brand health across campaignsnot Castor EDC
  • Validating creative concepts before launchnot Castor EDC
  • Researching market trends in 70 languagesnot Castor EDC

Castor EDC

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

Where each one falls short

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

Attest

  • Pricing is metered by credits, where one credit equals one survey question answered by one person, rather than a flat per seat rate
  • The Basic tier caps usage at 50,000 credits; going beyond it requires upgrading to Standard (100,000), Elite (200,000) or a custom plan above 400,000
  • Additional credits purchased mid year cost 10 percent more per credit than the plan rate

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.

Pricing, plan by plan

Attest

On request
  • Basic$undefined/mo
    • Up to 50,000 credits
  • Standard$undefined/mo
    • Up to 100,000 credits
  • Elite$undefined/mo
    • Up to 200,000 credits
  • Custom$undefined/mo
    • Over 400,000+ credits

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

Which should you pick?

Choose Attest if

Nothing in the data separates Attest from Castor EDC on the points above - pick on price and on how each one feels to use.

Attest review

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

Questions people ask

Is Attest or Castor EDC better?
Neither clearly leads. Attest starts at On request and Castor EDC at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Attest or Castor EDC?
Attest starts at On request and Castor EDC at On request.
Does Attest or Castor EDC run on more platforms?
Attest runs on Web. Castor EDC runs on Web, iOS, Android.
What is Attest best used for?
Attest is most often used for testing product concepts with global audiences, monitoring brand health across campaigns, validating creative concepts before launch, researching market trends in 70 languages. Of those, testing product concepts with global audiences and monitoring brand health across campaigns are not what Castor EDC is typically brought in for.
What can Attest do that Castor EDC cannot?
Castor EDC covers Browser-based study build, 21 CFR Part 11 workflows, eConsent, ePRO and surveys.

Answered from the vendors’ own pages

Attest: How does Attest's credit system work?

Attest uses a credit-based pricing system where one credit equals one survey answer from one respondent. For example, a 10-question survey completed by 500 people uses 5,000 credits. Only respondents who meet survey criteria consume credits from the qualifying question.

Source
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.

Attest: What plans does Attest offer?

Attest offers four subscription plans: Basic (up to 50,000 credits), Standard (up to 100,000 credits), Elite (up to 200,000 credits), and Custom (over 400,000+ credits). All plans include unlimited user seats, designated research expert, customer success team support, and access to 150+ million consumers across 59 countries in 70+ languages.

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.

Attest: Can I purchase additional credits on Attest?

Yes. Additional credits are available as add-ons throughout the year. Add-on credits cost 10% more than the per-credit rate in annual plans.

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.

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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