# ePRO by Mobile4D vs CTCAE 5 Pro

The clearest difference is in-app purchases: ePRO by Mobile4D at none against CTCAE 5 Pro's 2. ePRO by Mobile4D also leads on update cadence (fortnightly vs every 5 weeks) and iOS requirement (12.0 vs 15.5). On price, ads and device support there is nothing between them.

Both are free to download. CTCAE 5 Pro sells 2 in-app purchases, starting at $1.99 per month. ePRO by Mobile4D asks for nothing beyond the download.

ePRO by Mobile4D ships an update fortnightly, CTCAE 5 Pro every 5 weeks. The most recent releases landed on October 7, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ePRO by Mobile4D | CTCAE 5 Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (41 ratings)](https://appshunter.io/ios/app/ctcae-5-pro/id1625569535/reviews)** |
| Number of ratings | — | **41** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | — | Freemium |
| Size | 63 MB | 60 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Universitat Bremen](https://appshunter.io/developer/1236712029) | [Koichiro Watanabe](https://appshunter.io/developer/1077985400) |

## What reviewers say

### ePRO by Mobile4D

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

**In-app purchases:** none


### CTCAE 5 Pro

[App page](https://appshunter.io/ios/app/ctcae-5-pro/id1625569535)

This app helps review and take notes on CTCAE documents. It offers local data storage for privacy and premium features like version comparison and advanced note-taking with a subscription.

**Highlights:** Streamlined CTCAE Document Access, Local data storage for enhanced privacy, Version comparison tool, Advanced chronological note-taking with hashtags, Custom app creation from spreadsheets, Flexible backup and archiving (XLSX, CSV)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $1.99 | per month |
| Annual subscription | $9.99 | per year |


## Frequently asked questions

### Is ePRO by Mobile4D free?

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

### Is CTCAE 5 Pro free?

CTCAE 5 Pro is free to download, with in-app purchases available.

### Do ePRO by Mobile4D or CTCAE 5 Pro have ads?

Neither ePRO by Mobile4D nor CTCAE 5 Pro shows ads.

### Which is updated more often, ePRO by Mobile4D or CTCAE 5 Pro?

ePRO by Mobile4D ships an update fortnightly, and CTCAE 5 Pro every 5 weeks. Most recently, ePRO by Mobile4D was updated on October 7, 2026 and CTCAE 5 Pro on October 27, 2026.

---

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