# CTC vs MK2400

The clearest difference is price: MK2400 at Free against CTC's $3.99. MK2400 also leads on in-app purchases (none vs 1) and update cadence (every 2 weeks vs every 2 months). On ads and device support there is nothing between them.

MK2400 is free to download; CTC costs $3.99 up front. CTC sells 1 one-off in-app purchase. MK2400 asks for nothing beyond the download.

CTC ships an update every 2 months, MK2400 every 2 weeks. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CTC | MK2400 |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 2 MB | 83 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Arpacore B.V.](https://appshunter.io/developer/1441928570) | [ERT, INC](https://appshunter.io/developer/1160214546) |

## 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 |


### MK2400

[App page](https://appshunter.io/ios/app/mk2400-001/id6742173498)

**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 MK2400 free?

MK2400 is free to download, with no in-app purchases.

### Do CTC or MK2400 have ads?

Neither CTC nor MK2400 shows ads.

### Which is updated more often, CTC or MK2400?

CTC ships an update every 2 months, and MK2400 every 2 weeks. Most recently, CTC was updated on October 29, 2026 and MK2400 on October 28, 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.*