# Circuitry vs Engineering Formulas

The clearest difference is in-app purchases: Circuitry at none against Engineering Formulas's 3. Circuitry also leads on iOS requirement (12.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Engineering Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. Circuitry asks for nothing beyond the download.

Circuitry ships an update every 4 months, Engineering Formulas every 2 months. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Circuitry | Engineering Formulas |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (155 ratings)](https://appshunter.io/ios/app/circuitry-3d-circuit-builder/id1476733898/reviews)** | — |
| Number of ratings | **155** | — |
| Positive reviews | 51.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 35 MB | 45 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Raffael Kaehn](https://appshunter.io/developer/1234032836) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## 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


### Engineering Formulas

[App page](https://appshunter.io/ios/app/engineering-formulas-engiref/id6758258119)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $29.99 | per year |
| Lifetime Access | $54.99 | one-time |


## Frequently asked questions

### Is Circuitry free?

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

### Is Engineering Formulas free?

Engineering Formulas is free to download, with in-app purchases available.

### Do Circuitry or Engineering Formulas have ads?

Neither Circuitry nor Engineering Formulas shows ads.

### Which is updated more often, Circuitry or Engineering Formulas?

Circuitry ships an update every 4 months, and Engineering Formulas every 2 months. Most recently, Circuitry was updated on October 17, 2026 and Engineering Formulas on October 4, 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.*