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Castor EDC vs FormAssembly Comparison (2026)

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Good recommendations?

Castor EDC

FormAssembly

Overview

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

Seamlessly combine forms, emails, approvals, e-signatures, and notifications into one automated data collection solution with just a few clicks. Create powerful, repeatable processes with intuitive drag-and-drop responsive features.

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

No pricing info

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

4.5

103

Value for money

Ease of use

Features

Customer support

82%

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

“The features are either at parity or exceed the other tools I've had experience with over my tenure as a Marketing Technologist. But the real engine of the tool lies in it's 'workflows' - programs that allow complex decision making at the back end of each form and allow you to connect to different APIs.”

Sarah F.

Marketing Technologist

“FormAssembly is solving the challenge of collecting and managing student data from multiple sources. Before we had to gather information through emails or spreadsheets which was time-consuming and prone to errors.”

Julia E.

Admissions and Records Officer

“The cost per user exceeds what many enterprise organizations are willing to pay for the functionality. While the UI is straightforward, the tool takes some getting used to due to the level of customization for each field.”

Sarah F.

Marketing Technologist

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

“Save and Resume is unwieldy (confusing and complicated) without upgrading to Teams at greater expense.”

Beverly M.

Director of Governmental Affairs and IT

“You're likely to fail your first few tests when setting up an integration with a CRM for example.”

Sarah F.

Marketing Technologist