# OEI Sim vs ECG Vector

The clearest difference is review sentiment: OEI Sim at 100% against ECG Vector's 0%. OEI Sim also leads on in-app purchases (none vs 1) and iOS requirement (14.1 vs 17.0). ECG Vector's advantage is update cadence (weekly vs every 3 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. ECG Vector sells 1 one-off in-app purchase. OEI Sim asks for nothing beyond the download.

OEI Sim ships an update every 3 months, ECG Vector weekly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OEI Sim | ECG Vector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/oei-sim/id1309239396/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 47 MB | 12 MB |
| Requires iOS | **14.1** | 17.0 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Operative Experience Inc](https://appshunter.io/developer/1309239394) | [Takashi Nakano](https://appshunter.io/developer/6780341829) |

## 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


### ECG Vector

[App page](https://appshunter.io/ios/app/ecg-vector/id6798066790)

This educational simulator allows users to explore the relationship between the heart's electrical activity and ECG waveforms. It offers interactive workspaces to visualize cardiac processes, ion channel functions, and simulate cardiac rhythms. Users can learn and test their knowledge through quizzes, with both free and paid features available.

**Highlights:** 3D cardiac activation visualization, Ion channel and ECG correlation, Ventricular action potential simulation, Cardiac rhythm adjustment and exploration, ECG pattern identification and quizzes, Cross-platform compatibility (Mac, iPhone, iPad)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ECG Vector Pro | $6.99 | one-time |


## Frequently asked questions

### Is OEI Sim free?

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

### Is ECG Vector free?

ECG Vector is free to download, with in-app purchases available.

### Do OEI Sim or ECG Vector have ads?

Neither OEI Sim nor ECG Vector shows ads.

### Which is updated more often, OEI Sim or ECG Vector?

OEI Sim ships an update every 3 months, and ECG Vector weekly. Most recently, OEI Sim was updated on November 4, 2026 and ECG Vector on October 31, 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.*