CTCAE 6 Pro vs C4 Therapeutics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CTCAE 6 Pro
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.
- 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
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CTCAE 6 Pro helps you review and take notes on CTCAE content with ease. It is not intended for diagnosis, clinical decisions, or treatment planning. Standard Features: • Quick CTCAE Access: Browse CTCAE 6.0 content with ease • Unlimited Flags: Bookmark AEs without limits • Search with Highlighting: Easily spot keywords in context • Local Data Storage: Keep your data secure and private on your device Premium Features (Subscription Users): • Version Comparison (5.0 ⇄ 6.0) • Smart Notes: Organize CTCAE entries chronologically, use hashtags, and more • Spreadsheet to App: Turn your spreadsheet into a custom list app—no coding required • Easy Backups: Export to XLSX or CSV for flexibility • Optimized Printing & Sharing: Export HTML files for instant viewing on any desktop or laptop, with easy letter-size printing • Timeline Management: Track and log AEs on a day-by-day basis
C4 Therapeutics
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App is intended for use to collect patient reported outcomes relating to a clinical trial. Patients must be given accounts by a participating site in order to log in to the app.
Screenshots
Verdict
The clearest difference is in-app purchases: C4 Therapeutics at none against CTCAE 6 Pro's 2. C4 Therapeutics also leads on iOS requirement (12.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. CTCAE 6 Pro sells 2 in-app purchases, starting at $1.99 per month. C4 Therapeutics asks for nothing beyond the download.
CTCAE 6 Pro ships an update monthly, C4 Therapeutics every 2 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.
| Parameter | CTCAE 6 Pro | C4 Therapeutics |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (10 ratings) — better | — |
| Number of ratings | 10 — better | — |
| Update frequency | Monthly | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 87 MB | 77 MB |
| Age rating | 17+ | 12+ |
| Developer | Koichiro Watanabe | ERT, INC |
In-app purchases
CTCAE 6 Pro
- Premium Plan – Monthly7 Days trial$1.991 Month
- Premium Plan – Annual7 Days trial$9.991 Year
C4 Therapeutics
No in-app purchases
Questions
Is CTCAE 6 Pro free?
Is C4 Therapeutics free?
Do CTCAE 6 Pro or C4 Therapeutics have ads?
Which is updated more often, CTCAE 6 Pro or C4 Therapeutics?
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