Decentralized Clinical Trial Platform – Remote & Hybrid Trials Made Easy
Built for researchers. Built for patients. Built to scale.
Castor’s suite of decentralized research tools is adaptable whether you’re just starting your journey into hybrid trials or you are ready to fully dive into decentralization.

The Castor difference
Why choose Castor for decentralized clinical trials?
Castor is one of the few decentralized clinical trial platforms that combines EDC, ePRO, eCOA, eConsent and eRecruitment natively, with no middleware required. This gives teams a single validated system for all trial data, simplified regulatory submissions and lower total cost of ownership.
Unlike point solutions that require complex integrations, Castor gives sponsors, biotech companies and academic researchers a unified data environment from enrollment to lock. Trusted by 50,000+ researchers across academic, biotech and pharma settings worldwide.
50,000+
Researchers worldwide
90+
Countries supported
5-in-1
EDC, ePRO, eCOA, eConsent and eRecruitment in one platform
21 CFR Part 11
Regulatory compliant, GCP-aligned
Flexible tech for modern clinical trial needs
Castor’s decentralized clinical trials platform enables you with unparalleled control. Each DCT module can be used alone or together, enabling you to plug-and-play with each tool, build a foundation of technology that can flex to meet your unique study needs, and scale at your own pace. Whether you’re running decentralized clinical trials, hybrid studies, or fully remote research.
Simplifying clinical research for you and the patient
Build clinical trials that are more efficient and more engaging for your participants with automated recruitment and enrollment, a native ePRO app for simplified data collection, and an intuitive interface with built-in video capability.
High quality, centralized data collection that makes sense for you
With Castor, you can always feel empowered to design a DCT workflow that’s flexible and right for your trial, while never losing confidence in the strength of your data. Our open API gives customers the freedom to work with other platforms and data in their clinical trial ecosystem, integrating data from all sources and standardizing them for clinical relevance.
Success story
Launching a successful COVID-19 study with Castor’s DCT platform
World’s first study to use machine learning in diagnosis of COVID-19, supported by TAKEDA and Julius Clinical
“Using Castor, we succeeded in recruiting over 17,824 patients enrolled in 15 weeks during a global pandemic, an achievement that could not have been accomplished without tools purpose-built with decentralized trials in mind.”
Marcel Van Willigen
Julius Clinical
Why decentralized clinical trials improve research outcomes
Decentralized clinical trials remove the barriers between patients and research. When participants can engage from home, trials become more accessible, more representative and more operationally efficient.
Faster patient recruitment
Remove geographic barriers and reach eligible participants across wider populations. Decentralized clinical trials consistently report faster enrollment versus traditional site-based studies.
Higher patient retention rates
Patients who participate from home are significantly less likely to withdraw. Fewer missed visits, lower dropout rates and more complete datasets improve the quality of your results.
Better real-world data capture
Collect continuous, ecological data from patients in their natural environment. Remote data capture surfaces outcomes that in-clinic visits miss and supports more representative datasets.
Reduced site burden and costs
Cut monitoring travel, paper handling and manual data reconciliation. Decentralized clinical trials reduce per-patient operational costs without compromising data quality or regulatory compliance.
Improved protocol compliance
Automated visit reminders, digital questionnaires and real-time compliance monitoring keep participants on schedule and reduce protocol deviations across your study population.
Trial design guide
Decentralized, hybrid and traditional trials: what is the difference?
Not all trial designs work for every protocol. Understanding the structure of decentralized, hybrid and traditional clinical trials helps sponsors choose the right model for their patient population and data requirements.
| Feature | Decentralized clinical trial Castor-powered | Hybrid clinical trial | Traditional trial |
|---|---|---|---|
| Patient location | Remote, home-based or local pharmacy/clinic | Mix of home and investigative site | On-site at investigative site only |
| Visit structure | All visits virtual via app or portal | Some virtual, some in-person | All visits in-person |
| Data collection | ePRO, eCOA, EDC via app or web portal | Digital tools and site-based EDC | Site-based EDC or paper |
| Cost profile | Lower per-patient costs, reduced monitoring burden | Moderate costs | Higher per-patient costs and site monitoring overhead |
| Best suited for | Chronic conditions, large geographic catchment, patient-centric endpoints | Protocols requiring some procedures on-site | Complex interventions, device trials, procedures requiring clinical setting |
| Castor support | ✓ Full platform support | ✓ Full platform support | ✓ Full platform support |
FAQs
Frequently asked questions about decentralized clinical trials
Answers to the most common questions about decentralized clinical trial design, technology and how Castor supports your study from setup to lock.
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Getting started
Key features
eRecruitment and patient matching
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Ensure eligibility, increase your reach to potential participants, and reduce site and participant burden with pre-screening surveys.
Hybrid eConsent (electronic informed consent) for remote or on-site
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Castor’s eConsent (electronic informed consent) solution features built-in video conferencing, so you can provide a high-touch experience while minimizing the distance participants need to travel.
Native ePRO (Electronic Patient-Reported Outcomes) app and eCOA (electronic clinical outcome assessments) solution
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Increase engagement by providing an enhanced experience for participants and reduce administrative burden by simplifying data collection.
Sensor & wearable integration
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Collect real-time biometric data and other digital endpoints with Castor’s robust API and philosophy of interoperability.
Integrated EDC (electronic data capture) with seamless integration
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Castor’s built-in Integrated EDC (electronic data capture) system makes it easier to deploy studies faster, capture real-world trial data, and integrate it seamlessly with other data in your ecosystem.
API and Interoperability
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Minimize SDV procedures and data error while eliminating your need for duplicate documentation.
Delivering shorter build-times and seamless integration
Clinical trials succeed when data flows. That’s why Castor is reengineering traditionally stodgy processes with easy-to-use digital tools that remove barriers for participants and researchers.
See why our company was chosen as a Major Contender impacting the market in the Everest Group’s PEAK Matrix® of Decentralized Clinical Trials Platforms Assessment 2023.
Featured resource
Getting started with DCT in 2022
Transitioning to a DCT model can be an intimidating task to approach. Learn how to compartmentalize DCT technology into 3 approachable tiers and get started building an ecosystem for decentralized research at your own pace.
Interested in implementing DCT technology into your next clinical trial, but not sure where to start?
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