# CTCAE 6 Pro vs ASCO

The clearest difference is in-app purchases: ASCO at none against CTCAE 6 Pro's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CTCAE 6 Pro sells 2 in-app purchases, starting at $1.99 per month. ASCO asks for nothing beyond the download.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 25, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | CTCAE 6 Pro | ASCO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/ctcae-6-pro/id1625560237/reviews)** | — |
| Number of ratings | **8** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | Freemium | — |
| Size | 87 MB | 59 MB |
| Requires iOS | **15.6** | 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 6 Pro

[App page](https://appshunter.io/ios/app/ctcae-6-pro/id1625560237)

Easily review and annotate medical toxicity criteria. Bookmark adverse events, search keywords, and organize entries chronologically. Offers local data storage and optional premium features for advanced note-taking and data export.

**Highlights:** Quick CTCAE 6.0 content access, Unlimited adverse event bookmarking, Keyword search with highlighting, Local data storage, Version comparison (5.0 ⇄ 6.0), Smart notes and timeline management, Spreadsheet to custom list app conversion

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan – Monthly | $1.99 | per month |
| Premium Plan – Annual | $9.99 | per year |


### ASCO

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

**In-app purchases:** none


## Frequently asked questions

### Is CTCAE 6 Pro free?

CTCAE 6 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 6 Pro or ASCO have ads?

Neither CTCAE 6 Pro nor ASCO shows ads.

### Which is updated more often, CTCAE 6 Pro or ASCO?

CTCAE 6 Pro ships an update monthly, and ASCO monthly. Most recently, CTCAE 6 Pro was updated on September 25, 2026 and ASCO on September 23, 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.*