OpenClinica vs. Castor

Here’s how OpenClinica differentiates on patient recruitment, pricing transparency, and proven data quality outcomes.

Side-by-Side Comparison

What Makes OpenClinica Different

Outbound Patient Recruitment

Precision-targeted digital advertising and multi-channel outbound campaigns actively reach qualified participants at 3-5x lower cost per conversion—not just portal tools.

Transparent Pricing

Modular pricing means you pay only for what you need, with no hidden fees or surprise upcharges.

EHR-to-EDC at Proven Scale

OpenClinica's EHR integration operates across 450+ clinical trial sites within major health systems—proven network infrastructure, not just technical capability.

Data Quality Improvements

Real-time edit checks and automated validations deliver results: customers report 50% fewer data queries compared to their previous systems.

Support That Scales

Every client gets a dedicated Customer Success Manager and 24/5 support from people who've actually worked in clinical research.

20+ Years of Experience

10,000+ studies across 100+ countries, with continuous improvements driven by customer feedback since 2006.

Frequently Asked Questions

  1. How do the patient recruitment approaches differ?

    Castor offers study enrollment portals and pre-screening tools—customizable web portals where participants can browse trials, express interest, and complete pre-screening questionnaires. This is portal-based recruitment: you build it and qualified participants come to you.


    OpenClinica Recruit
    uses precision-targeted digital advertising (social media, search engines, multi-channel campaigns) with smart pre-screening to actively reach qualified participants wherever they are—even if they’re not actively searching for trials. Qualified leads flow directly into your EDC with full HIPAA/GDPR compliance.


    Bottom line:
    If you want to actively find participants through outbound marketing rather than waiting for them to discover your portal, OpenClinica’s approach delivers 3-5x lower cost per conversion with end-to-end integration.

  2. How does pricing compare?

    OpenClinica: Transparent, modular pricing based on your study volume and which solutions you need (EDC, eConsent, eCOA, Randomization, etc.). You see exactly what you’re paying for upfront—no hidden fees or surprise change orders. Flexible packages align with grant cycles and study volumes.


    Castor:
    Pricing varies by region and package configuration.

    Bottom line: If budget predictability and transparent pricing matter to your procurement process, OpenClinica’s modular approach removes uncertainty.

  3. What if I need help during implementation?

    Every OpenClinica client gets a Customer Success Manager, 24/5 application support from people who’ve worked in clinical research, on-demand training via our Learning Management System, and Professional Services available for hands-on study build support (optional).


    You’re never on your own—but you’re also not dependent on a services team to do basic tasks.

  4. Do you support global, multi-site studies?

    Yes. OpenClinica supports studies across 100+ countries with the same compliance standards required for regulatory submissions worldwide (21 CFR Part 11, HIPAA, GDPR, GCP).


    In practice, this means multilingual interfaces for global sites, data residency options for regional compliance, role-based permissions for multi-site oversight, and real-time dashboards across all sites and studies.

  5. Can I integrate OpenClinica with other systems?

    Yes. OpenClinica offers an industry-standard API (CDISC ODM-based) for real-time data exchange with labs, CTMS, pharmacovigilance, imaging systems, and other clinical platforms. EHR-to-EDC integration pulls data directly from electronic health records. You can use existing integrations or build your own—API access and support is included.


    OpenClinica plays well with your existing tech stack—you’re not locked into a closed ecosystem.

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