# Castor Connect vs INFORMUS

The clearest difference is iOS requirement: Castor Connect at 13.0 against INFORMUS's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Castor Connect ships an update every 2 months, INFORMUS monthly. The most recent releases landed on September 16, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | Castor Connect | INFORMUS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (8 ratings)](https://appshunter.io/ios/app/informus/id6471454872/reviews)** |
| Number of ratings | — | **8** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 28 MB | 46 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ciwit B.V.](https://appshunter.io/developer/1009756772) | [Caerus Marketing Group LLC](https://appshunter.io/developer/1301549334) |

## What reviewers say

### Castor Connect

[App page](https://appshunter.io/ios/app/castor-connect/id1532340302)

This app allows study participants to securely complete electronic patient-reported outcome (ePRO) questionnaires on their mobile devices. It offers offline data storage and manual syncing for flexibility. Access requires an invitation or activation code.

**Highlights:** ePRO questionnaire completion, Offline data storage, Manual data sync, Secure participant data, Native mobile application

**In-app purchases:** none


### INFORMUS

[App page](https://appshunter.io/ios/app/informus/id6471454872)

This app helps clinical trial participants manage their study information, including treatment plans, appointments, and payments. It allows users to track daily dosage results and access helpful study resources through a user-friendly interface.

**Highlights:** Access treatment plans and appointments, View payment information, Track daily dosage results, Access study information, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Castor Connect free?

Castor Connect is free to download, with no in-app purchases.

### Is INFORMUS free?

INFORMUS is free to download, with no in-app purchases.

### Do Castor Connect or INFORMUS have ads?

Neither Castor Connect nor INFORMUS shows ads.

### Which is updated more often, Castor Connect or INFORMUS?

Castor Connect ships an update every 2 months, and INFORMUS monthly. Most recently, Castor Connect was updated on September 16, 2026 and INFORMUS on June 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*