# CTCAE 5 Pro vs ASCO

The clearest difference is in-app purchases: ASCO at none against CTCAE 5 Pro's 2. On price, update cadence, 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. ASCO asks for nothing beyond the download.

CTCAE 5 Pro ships an update every 5 weeks, ASCO every 3 weeks. The most recent releases landed on October 21, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | CTCAE 5 Pro | ASCO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (38 ratings)](https://appshunter.io/ios/app/ctcae-5-pro/id1625569535/reviews)** | — |
| Number of ratings | **38** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | Freemium | — |
| Size | 60 MB | 59 MB |
| Requires iOS | **15.5** | 16 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Koichiro Watanabe](https://appshunter.io/developer/1077985400) | [American Society of Clinical Oncology](https://appshunter.io/developer/1513043539) |

## What reviewers say

### 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 |


### ASCO

[App page](https://appshunter.io/ios/app/asco/id6742142845)

**In-app purchases:** none


## Frequently asked questions

### Is CTCAE 5 Pro free?

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

### Is ASCO free?

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

### Do CTCAE 5 Pro or ASCO have ads?

Neither CTCAE 5 Pro nor ASCO shows ads.

### Which is updated more often, CTCAE 5 Pro or ASCO?

CTCAE 5 Pro ships an update every 5 weeks, and ASCO every 3 weeks. Most recently, CTCAE 5 Pro was updated on October 21, 2026 and ASCO on October 17, 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.*