# CTC vs ePRO by Mobile4D

The clearest difference is price: ePRO by Mobile4D at Free against CTC's $3.99. ePRO by Mobile4D also leads on in-app purchases (none vs 1) and update cadence (fortnightly vs every 2 months). On ads and device support there is nothing between them.

ePRO by Mobile4D is free to download; CTC costs $3.99 up front. CTC sells 1 one-off in-app purchase. ePRO by Mobile4D asks for nothing beyond the download.

CTC ships an update every 2 months, ePRO by Mobile4D fortnightly. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CTC | ePRO by Mobile4D |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 2 MB | 63 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Arpacore B.V.](https://appshunter.io/developer/1441928570) | [Universitat Bremen](https://appshunter.io/developer/1236712029) |

## 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 |


### ePRO by Mobile4D

[App page](https://appshunter.io/ios/app/epro-by-mobile4d/id1616214804)

**In-app purchases:** none


## Frequently asked questions

### Is CTC free?

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

### Is ePRO by Mobile4D free?

ePRO by Mobile4D is free to download, with no in-app purchases.

### Do CTC or ePRO by Mobile4D have ads?

Neither CTC nor ePRO by Mobile4D shows ads.

### Which is updated more often, CTC or ePRO by Mobile4D?

CTC ships an update every 2 months, and ePRO by Mobile4D fortnightly. Most recently, CTC was updated on October 17, 2026 and ePRO by Mobile4D on October 7, 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.*