# Castor Connect — Engage, Participate, Connect!

> Mobile application for study participants to complete ePRO questionnaires. (iPhone/iPad app by Ciwit B.V..)

- Source: https://appshunter.io/ios/app/castor-connect/id1532340302 (this page in markdown: same URL + `.md`)
- Developer: [Ciwit B.V.](https://appshunter.io/developer/1009756772)
- Category: Health & Fitness, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 28 MB
- Languages: Czech, Dutch, English, French, German, Hungarian, Italian, Lithuanian, Polish, Portuguese and 5 more
- Released: 2021-06-11
- Data updated: 2026-07-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/castor-connect/id1532340302/reviews.md

## What is Castor Connect?

Castor Connect enables study participants to complete Castor Surveys (ePRO questionnaires) via a native mobile application.

- Compliant, secure, user-friendly ePRO solution
- Configured using our EDC product to be as simple or complex as your study demands
- Flexible and secure, offline data storage with manual sync and native security mean participants can submit their study data whenever they need

An invitation to take part or the scanning of a participant-specific activation code is required to use this application. You can find more information about Castor surveys or Castor Connect at castoredc.com/epro

## Key features

- ePRO questionnaire completion
- Offline data storage
- Manual data sync
- Secure participant data
- Native mobile application


## Frequently asked questions about Castor Connect

### What is Castor Connect used for?

Castor Connect is a mobile application designed for study participants to securely complete electronic patient-reported outcome (ePRO) questionnaires. It's configured through Castor's EDC product to meet the specific needs of various studies.

### How do I get started with Castor Connect?

To use Castor Connect, you will need an invitation to participate in a study or a participant-specific activation code. This ensures secure and authorized access to the study's questionnaires.

### Does Castor Connect work offline?

Yes, Castor Connect offers flexible and secure offline data storage. Participants can complete questionnaires without an internet connection and submit their study data manually when they are back online.

### Is Castor Connect secure?

Castor Connect is designed as a compliant and secure ePRO solution. It utilizes native security features to protect participant data during storage and submission.

### What devices support Castor Connect?

Castor Connect is available for iPhone, iPad, and iPod devices, allowing participants to engage with their study on their preferred Apple mobile device.

### When was Castor Connect last updated?

The latest version of Castor Connect, 2026.1.0.1, was last updated on April 21, 2026. This indicates frequent updates to ensure reliability and security.

### What is the age rating for Castor Connect?

Castor Connect has an age rating of 4+, making it suitable for a wide range of participants in clinical studies.

### Does Castor Connect have ads?

No, Castor Connect is ad-free. As a free application, it focuses on providing a seamless and uninterrupted experience for study participants.

## Version history (last 5 releases)

### 2026.1.0.2 — 2026-07-03

- Fixed an issue where date values in calculation fields were submitted in a localized format instead of the expected date format, causing data inconsistencies.

### 2026.1.0.1 — 2026-04-21

- Fixed an issue where photos uploaded in surveys were not visible to site staff after submission.
- Fixed a 400 error that occurred when syncing a survey that was queued because the app was closed during an active sync.
- Fixed an issue where repeatable surveys created by automated workflows were incorrectly hidden, preventing participants from
  starting new repeat instances.

### 2025.2.0.0 (Q4) — 2025-10-16

A series of small updates have been included in this latest release: It is now possible to display/use hidden values in summary fields; We have resolved an issue where a limited subset of users on older versions of iOS were experiencing issues registering in the app; We have resolved an issue where - when a participant was locked by a clinician - the app UI was not clear on current status.

### 2025.2.0.0 — 2025-08-11

- Some of the underlying libraries of the app have been updated to newer versions to ensure continued maintainability and performance in the future - this has no impact on the UI/patient experience
- A new ‘My details page’ will be available for newly created studies, letting the participant know their participant, side, and study ID
- It is now possible to configure dates to reflect locale of a participant's site - enabling MM-DD-YYYY presentation
- We have resolved an issue where studies with no or negative lower limits on numeric fields were not displaying the minus key by defaulting to an alphanum keyboard

### 2025.1.0.0 — 2025-02-10

- NRS field types are now supported in Castor Connect
- Partial dates are now supported - consistent with their implementation in web surveys on CDMS
- Korean, Danish, Turkish and Hebrew are now available as core languages in the app
- Exclusion triggers in surveys are now supported in-app
- Users of the EQ-5D variant of the slider will now see the text in the health box capitalised
- iPadOS: Resolved an issue where the PIN dialog on returning to the app was not obfuscating entered data as expected
- Participants who are not on the correct date/time based on a combination of checking against Castor's servers and a sequential check will not be able to enter data until they have corrected the date/time on their device - this check will be performed each time the participant attempts to open a survey

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*