# CTC vs Shared Investigator Platform

The clearest difference is price: Shared Investigator Platform at Free against CTC's $3.99. Shared Investigator Platform also leads on review sentiment (100% vs 56%) and in-app purchases (none vs 1). CTC's advantage is update cadence (every 2 months vs every 6 months). On ads and device support there is nothing between them.

Shared Investigator Platform is free to download; CTC costs $3.99 up front. CTC sells 1 one-off in-app purchase. Shared Investigator Platform asks for nothing beyond the download.

CTC ships an update every 2 months, Shared Investigator Platform every 6 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | CTC | Shared Investigator Platform |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/shared-investigator-platform/id6450245868/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 55.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 2 MB | 44 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Arpacore B.V.](https://appshunter.io/developer/1441928570) | [Cognizant Technology Solutions](https://appshunter.io/developer/387144373) |

## What reviewers say

### CTC

[App page](https://appshunter.io/ios/app/ctc-ae-plus/id349258523)

This medical reference app provides quick access to standardized adverse event criteria and grading scales for oncology research. It allows for efficient logging, tracking, and reporting of patient events, including performance scores and custom entries. Data is kept strictly on-device for privacy and compliance.

**Highlights:** CTCAE v4 and v5 reference, Performance score integration (Karnofsky, ECOG, Lansky), Advanced adverse event logger, Custom event creation, CSV data import/export, On-device data storage

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Adverse Event Logger | $3.99 | one-time |


### Shared Investigator Platform

[App page](https://appshunter.io/ios/app/shared-investigator-platform/id6450245868)

This mobile application allows clinical trial site users to manage their actions on the Shared Investigator Platform. It facilitates easy login, E-signing, reviewing pending actions, accepting study invitations, and managing study staff. Users can also access study documents, complete tasks, and receive important notifications.

**Highlights:** User-friendly interface, E-sign functionality, Biometric authentication, Review pending actions, Accept study invitations, Manage study staff, Access study documents

**In-app purchases:** none


## Frequently asked questions

### Is CTC free?

CTC costs $3.99, and also offers in-app purchases.

### Is Shared Investigator Platform free?

Shared Investigator Platform is free to download, with no in-app purchases.

### Do CTC or Shared Investigator Platform have ads?

Neither CTC nor Shared Investigator Platform shows ads.

### Which is updated more often, CTC or Shared Investigator Platform?

CTC ships an update every 2 months, and Shared Investigator Platform every 6 months. Most recently, CTC was updated on October 24, 2026 and Shared Investigator Platform on October 16, 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.*