# CTGi vs SAM4 Online

The clearest difference is in-app purchases: CTGi at none against SAM4 Online's 1. CTGi also leads on update cadence (every 3 months vs every 6 months). SAM4 Online's advantage is device support (3 vs 1). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. SAM4 Online sells 1 one-off in-app purchase. CTGi asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for CTGi against 5.0 for SAM4 Online. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

CTGi ships an update every 3 months, SAM4 Online every 6 months. The most recent releases landed on September 1, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | CTGi | SAM4 Online |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/ctgi/id1342875195/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sam4-online/id1615890331/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 23 MB | 90 MB |
| Requires iOS | 13.0 | **12.2** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [iSimulate Pty Ltd](https://appshunter.io/developer/494486341) | [3B Scientific](https://appshunter.io/developer/1407867777) |

## What reviewers say

### CTGi

[App page](https://appshunter.io/ios/app/ctgi/id1342875195)

This app simulates a fetal heart rate monitor for obstetric training. It offers a realistic and economical platform for facilitators and students to learn and practice. Utilizing everyday technology, it provides an advanced simulation experience.

**Highlights:** Realistic fetal heart rate monitoring simulation, Economical training solution, Ideal for in-situ training, Advanced obstetric simulation, Built with everyday technology

**Features:** Vision Pro support

**In-app purchases:** none


### SAM4 Online

[App page](https://appshunter.io/ios/app/sam4-online/id1615890331)

This interactive platform offers extensive simulated sound libraries and lesson guides for over 60 medical conditions. It provides students with easy access to class materials, quizzes, tests, and a virtual manikin for auscultation training.

**Highlights:** Simulated sounds library, Lesson guides for 60+ conditions, Virtual manikin simulator, Access to class materials, Quizzes and tests, Control physical manikin

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Personal User - Full Content | $19.99 | one-time |


## Frequently asked questions

### Is CTGi free?

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

### Is SAM4 Online free?

SAM4 Online is free to download, with in-app purchases available.

### Which has better reviews, CTGi or SAM4 Online?

CTGi and SAM4 Online are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do CTGi or SAM4 Online have ads?

Neither CTGi nor SAM4 Online shows ads.

### Which is updated more often, CTGi or SAM4 Online?

CTGi ships an update every 3 months, and SAM4 Online every 6 months. Most recently, CTGi was updated on September 1, 2026 and SAM4 Online on September 18, 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.*