# Electrical Engineering vs LockBox

The clearest difference is in-app purchases: LockBox at none against Electrical Engineering's 8. LockBox also leads on update cadence (every 10 days vs every 2 months). Electrical Engineering's advantage is device support (3 vs 1) and iOS requirement (15.5 vs 17.6). On price and ads there is nothing between them.

Both are free to download. Electrical Engineering sells 7 in-app purchases, starting at $3.99 per month. LockBox asks for nothing beyond the download.

Electrical Engineering ships an update every 2 months, LockBox every 10 days. The most recent releases landed on October 22, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Electrical Engineering | LockBox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (12 ratings)](https://appshunter.io/ios/app/electrical-engineering-quiz/id1330321712/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 73.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 115 MB | 193 MB |
| Requires iOS | **15.5** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Carlo Terracciano](https://appshunter.io/developer/1159639539) | [aSocial Inc.](https://appshunter.io/developer/1716810986) |

## What reviewers say

### Electrical Engineering

[App page](https://appshunter.io/ios/app/electrical-engineering-quiz/id1330321712)

This app provides electrical calculations and fundamental concepts for students and professionals. It covers Ohm's Law, power calculations, circuit analysis, and advanced topics like wire sizing and power factor correction.

**Highlights:** Electrical calculations, Basic electrical knowledge, Advanced electrical topics, Ohm's Law and power calculations, Circuit analysis theorems, Wire sizing and voltage drop, Resistor color codes

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription - Electro | $3.99 | per month |
| Monthly subscription - Electro | $5.99 | per month |
| Annual Subscription Electronic | $8.99 | per year |
| Annual Subscription Electronic | $24.99 | per year |
| Annual Subscription Electronic | $24.99 | per year |
| Lifetime Subscription Electro | $29.99 | one-time |
| Circuits & Electric Machines | $99.99 | one-time |


### LockBox

[App page](https://appshunter.io/ios/app/lockbox-screentime-tool/id6740202232)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Electrical Engineering free?

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

### Is LockBox free?

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

### Do Electrical Engineering or LockBox have ads?

Both Electrical Engineering and LockBox show ads.

### Which is updated more often, Electrical Engineering or LockBox?

Electrical Engineering ships an update every 2 months, and LockBox every 10 days. Most recently, Electrical Engineering was updated on October 22, 2026 and LockBox on October 6, 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.*