# Circuitry vs Engine Room Simulator

The clearest difference is rating: Engine Room Simulator at 4.8 against Circuitry's 3.9. Engine Room Simulator also leads on update cadence (every 3 weeks vs every 4 months). Circuitry's advantage is in-app purchases (none vs 2) and ratings volume (156 vs 4). On price, ads and device support there is nothing between them.

Both are free to download. Engine Room Simulator sells 2 in-app purchases, starting at $9.99 per year. Circuitry asks for nothing beyond the download.

Engine Room Simulator holds the better App Store score, 4.8 against 3.9. That said, the two scores are not equally well evidenced: Circuitry has 156 ratings behind it against 4, so its average is the more settled of the two.

Circuitry ships an update every 4 months, Engine Room Simulator every 3 weeks. The most recent releases landed on October 21, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Circuitry | Engine Room Simulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (156 ratings)](https://appshunter.io/ios/app/circuitry-3d-circuit-builder/id1476733898/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/engine-room-simulator-ers/id6767850469/reviews)** |
| Number of ratings | **156** | 4 |
| Positive reviews | 51.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 174 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Raffael Kaehn](https://appshunter.io/developer/1234032836) | [Louie Juera](https://appshunter.io/developer/1638500957) |

## What reviewers say

### Circuitry

[App page](https://appshunter.io/ios/app/circuitry-3d-circuit-builder/id1476733898)

Build and simulate electronic circuits in an intuitive 3D environment. This app offers lightning-fast analysis and a user-friendly interface, making complex engineering accessible. Circuits are saved as documents for easy sharing and management across devices.

**Highlights:** 3D circuit building, GPU-accelerated analysis, Intuitive 3D interface, Document-based circuit files, Component placement and connection, Resistor, voltage source, light bulb components

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💡 Cool game idea
- 👍 Nice and 3D interface
- 🚀 Easy to use and perfect 3D
- 👍 Fun and simple
- 👍 Beautifully visual and interactive

**What reviewers complain about**

- 😞 Missing many components
- 😞 Limited functionality
- 😞 Not useful for professional work
- 😞 Inaccurate electrical simulation
- 😞 App is broken/crashes

**Reported bugs**

- App crashes on launch
- App doesn't work after download
- Blank white screen on opening
- App won't open, only shows a folder
- Lights won't turn on

**Requested features**

- Add more components (diodes, transistors, capacitors, inductors, speakers, microphones, resistors, switches, LEDs, displays, transformers)
- Add labels/names for components
- Add intensity and voltage for cables
- Add undo/redo buttons
- Add tutorials or guidance videos


### Engine Room Simulator

[App page](https://appshunter.io/ios/app/engine-room-simulator-ers/id6767850469)

This app offers a high-fidelity simulation for marine engineering training. It allows users to practice shipboard engine-room procedures, from safety training to full voyage simulation, with clear guidance and feedback. Ideal for cadets, students, and seafarers to build practical skills anytime, anywhere.

**Highlights:** High-fidelity marine engineering simulation, PPE safety training and induction, Generator synchronization and startup, Full voyage simulation, Guided and assessment learning modes, Offline practice capability

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ERS Pro Yearly | $9.99 | per year |
| ERS Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Circuitry free?

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

### Is Engine Room Simulator free?

Engine Room Simulator is free to download, with in-app purchases available.

### Which has better reviews, Circuitry or Engine Room Simulator?

Engine Room Simulator is rated higher. Circuitry averages 3.9 out of 5 from 156 ratings, while Engine Room Simulator averages 4.8 from 4 ratings.

### Do Circuitry or Engine Room Simulator have ads?

Neither Circuitry nor Engine Room Simulator shows ads.

### Which is updated more often, Circuitry or Engine Room Simulator?

Circuitry ships an update every 4 months, and Engine Room Simulator every 3 weeks. Most recently, Circuitry was updated on October 21, 2026 and Engine Room Simulator 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.*