Accelerating medical research

Online data capture for every medical researcher

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User friendly

  • Intuitive FormBuilder
  • No training required
  • Our support responds within the hour

Fully featured

  • Multicenter support
  • Randomisation
  • Surveys and more...


  • Free for small studies
  • Transparent pricing calculator
  • Discounts for institutes

Secure & Compliant

  • GCP & 21 CFR Part 11 (details)
  • EU Data Protection Directive
  • ISO27001 & ISO9001 hosting

Castor is used by researchers from


happy users

"I’m not a PC whizz, but with your guidance I was able to quickly and easily build my CRF."

Bee Barbini

Bee Barbini

Research Assistant, HIV & Sexual Health at King’s College London

"Building the case report form was quick and easy with the FormBuilder. We highly recommend Castor!"


Paul Teunissen

Research Fellow, Department of Cardiology at VU University Medical Center Amsterdam

"As a researcher I am dependent on many things, with Castor I can maintain my own study."

Tjarda Tromp - Radboudumc

Tjarda Tromp

Research Nurse Trauma, Vascular and Paediatric Surgery at Radboudumc