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Castor EDC vs Viedoc Comparison (2026)

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Castor EDC

Viedoc

Overview

The only GCP & 21 CFR compliant system that's affordable for every researcher and has all the features of expensive systems. Start now.

Viedoc delivers powerful eClinical solutions that streamline clinical trials, making data collection, management, and analysis faster and easier. Trusted in 75+ countries, powering 7,000+ studies with more than 1.6M+ participants.

Platforms supported

Web-based
iPhone app
Android app
Windows Phone app

Typical customers

Freelancers
Small businesses
Mid size businesses
Large enterprises

Customer support

Phone
Online
Knowledge base
Video tutorials

view more detailsview details

Platforms supported

Web-based
iPhone app
Android app
Windows Phone app

Typical customers

Freelancers
Small businesses
Mid size businesses
Large enterprises

Customer support

Phone
Online
Knowledge base
Video tutorials

view more detailsview details

Video & Screenshots

Pricing

Starting from

No pricing info

Free trial available
Credit cardless trial
Free account
Subscription based

Starting from

Free

Free trial available
Credit cardless trial
Free account
Subscription based

User reviews

4.7

204

141

Value for money

Ease of use

Features

Customer support

90%

would recommend this app

4.4

Value for money

Ease of use

Features

Customer support

89%

would recommend this app

Pros

“The option to come back and add more answers to a multiple-choice question while still working on the form (this is not a change to an answer but merely an addition of data). If I complete a form and later modify the contents of more than one question, the messages should be specific to each change rather than general for the entire page, since the reasons for each change might be different.”

David P.

Research technician

“I’ve been working with several EDC instruments and in Castor I’ve found an all in one tool with randomization, monitoring, high security level data storing, and a great flexibility to customize the eCRF.”

Javier M.

“In particular the survey was well designed to perform real-time quality assessment to promote completion of each section and provide feedback if answers were unclear. If there are any problems, human staff were readily available to resolve them.”

WILLIAM M.

Practicing physician. Director of clinical cancer research

Pros

“Viedoc is a custom friendly eCRF development platform, where you can customize the placement of fields anywhere as per the requirement, which is not part of any other EDCs.”

Kowsalya N.

Data Manager

“Its EDC system combines precision and simplicity with drag-and-drop study design, real-time data validation, and automated compliance (FDA 21 CFR Part 11, GDPR), speeding database development.”

Janus R.

Head of Data Management

“Viedoc seamlessly integrates EDC, ePRO, and RTMS into a unified, intuitive platform, for clinical trial management.”

Janus R.

Head of Data Management

Cons

“Also, I use an Ipad to log in to castor most of the times and I am not sure that when I need to input numbers on multiple fields the keyboard doesn't stay in numbers and I have to constantly swap from letters to numbers.”

Evita P.

Senior Research Nurse

“Sometimes the automatic track changes is a bit too sensitive: when I'm filling in the questionnaire and make 1 mistake, I have to change everything and explain it for every changed field.”

Lauren R.

Physician PhD-student

“The font size is too small.”

Mona I.

Research Analyst

Cons

“There is no option to leave comment in cases of data not applicable or not collected in error.”

Ebaa H.

Study Coordinator

“Lot of features from Viedoc 3 such as monitoring reports, sae reporting are lacking in viedoc 4.”

Rajalakshmi V.

Senior Technical Specialist

“Impossible to select a query from the research field with key words, impossible to navigate between several forms when an edit check is related to more than one form.”

Venel F.

Senior Data Manager