# Circuitry vs Engine Lab

The clearest difference is in-app purchases: Circuitry at none against Engine Lab's 1. Circuitry also leads on ratings volume (156 vs 2) and iOS requirement (12.0 vs 18.0). Engine Lab's advantage is update cadence (every 9 days vs every 4 months). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Engine Lab sells 1 one-off in-app purchase. Circuitry asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.9 for Circuitry against 4.0 for Engine Lab. That said, the two scores are not equally well evidenced: Circuitry has 156 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 51% of Circuitry's written reviews are positive against 50% of Engine Lab's.

Circuitry ships an update every 4 months, Engine Lab every 9 days. The most recent releases landed on November 3, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Circuitry | Engine Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (156 ratings)](https://appshunter.io/ios/app/circuitry-3d-circuit-builder/id1476733898/reviews) | **[4.0 (2 ratings)](https://appshunter.io/ios/app/engine-lab-simulator-and-sound/id6790748979/reviews)** |
| Number of ratings | **156** | 2 |
| Positive reviews | **51.4% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 16 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Raffael Kaehn](https://appshunter.io/developer/1234032836) | [Jan Sokol](https://appshunter.io/developer/1896490456) |

## 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 Lab

[App page](https://appshunter.io/ios/app/engine-lab-simulator-and-sound/id6790748979)

Design and simulate car engines, from single cylinders to V12s, and hear them run. Explore 3D models, test performance on a dyno, and even drive them with a simulated gearbox. Share your creations and compare them with others.

**Highlights:** Build custom engines, Hear engines idle and rev, 3D engine visualization, Simulated dyno testing, Manual/automatic gearbox simulation, Import and share engine builds

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Engine Lab Pro | $4.99 | one-time |


## Frequently asked questions

### Is Circuitry free?

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

### Is Engine Lab free?

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

### Which has better reviews, Circuitry or Engine Lab?

Engine Lab is rated higher. Circuitry averages 3.9 out of 5 from 156 ratings, while Engine Lab averages 4.0 from 2 ratings.

### Do Circuitry or Engine Lab have ads?

Neither Circuitry nor Engine Lab shows ads.

### Which is updated more often, Circuitry or Engine Lab?

Circuitry ships an update every 4 months, and Engine Lab every 9 days. Most recently, Circuitry was updated on November 3, 2026 and Engine Lab on November 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.*