# OEI Sim vs CTGi

OEI Sim and CTGi are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for OEI Sim against 5.0 for CTGi. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on June 1, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | OEI Sim | CTGi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/oei-sim/id1309239396/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/ctgi/id1342875195/reviews) |
| Number of ratings | **4** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 47 MB | 23 MB |
| Requires iOS | 14.1 | **13.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 17+ |
| Developer | [Operative Experience Inc](https://appshunter.io/developer/1309239394) | [iSimulate Pty Ltd](https://appshunter.io/developer/494486341) |

## What reviewers say

### OEI Sim

[App page](https://appshunter.io/ios/app/oei-sim/id1309239396)

This application allows instructors to remotely control patient simulators, adjusting vital signs, sounds, and physiological responses. It supports various simulators for tactical casualty care and birthing scenarios, providing detailed simulation management.

**Highlights:** Control simulator temperature and blood pressure, Adjust chest compression and pulse points, Manage ECG rhythms and lung sounds, Control heart and airway sounds, Log simulation activity, Real-time self-diagnostics

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is OEI Sim free?

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

### Is CTGi free?

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

### Which has better reviews, OEI Sim or CTGi?

OEI Sim and CTGi are both rated 5.0 out of 5 on the App Store, from 4 and 2 ratings respectively.

### Do OEI Sim or CTGi have ads?

Neither OEI Sim nor CTGi shows ads.

### Which is updated more often, OEI Sim or CTGi?

OEI Sim ships an update every 3 months, and CTGi every 3 months. Most recently, OEI Sim was updated on June 1, 2026 and CTGi on September 1, 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.*