# CTC vs Peter the Protocol Reader

The clearest difference is price: Peter the Protocol Reader at Free against CTC's $3.99. Peter the Protocol Reader also leads on in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 2 months). On ads, device support and iOS requirement there is nothing between them.

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

CTC ships an update every 2 months, Peter the Protocol Reader every 3 weeks. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | CTC | Peter the Protocol Reader |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/peter-the-protocol-reader/id6754336090/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 108 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Arpacore B.V.](https://appshunter.io/developer/1441928570) | [Care Access](https://appshunter.io/developer/1889628360) |

## 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 |


### Peter the Protocol Reader

[App page](https://appshunter.io/ios/app/peter-the-protocol-reader/id6754336090)

This AI assistant streamlines clinical research by quickly converting protocols into actionable insights. It's designed to enhance the quality and efficiency of research delivery for clinical sites.

**Highlights:** Protocol to practical insights, AI-powered assistance, High-quality research delivery, Secure and trusted, Confidence in research

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

**In-app purchases:** none


## Frequently asked questions

### Is CTC free?

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

### Is Peter the Protocol Reader free?

Peter the Protocol Reader is free to download, with no in-app purchases.

### Do CTC or Peter the Protocol Reader have ads?

Neither CTC nor Peter the Protocol Reader shows ads.

### Which is updated more often, CTC or Peter the Protocol Reader?

CTC ships an update every 2 months, and Peter the Protocol Reader every 3 weeks. Most recently, CTC was updated on October 1, 2026 and Peter the Protocol Reader on October 5, 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.*