# Electrical Engineering vs Opterra Cortex

The clearest difference is in-app purchases: Opterra Cortex at none against Electrical Engineering's 7. Opterra Cortex also leads on ads (none vs shown). Electrical Engineering's advantage is device support (3 vs 1). On price and iOS requirement there is nothing between them.

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

## The numbers

| Metric | Electrical Engineering | Opterra Cortex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (11 ratings)](https://appshunter.io/ios/app/electrical-engineering-quiz/id1330321712/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 73.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 115 MB | 35 MB |
| Requires iOS | **15.5** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Carlo Terracciano](https://appshunter.io/developer/1159639539) | [Evan Graven](https://appshunter.io/developer/1587270899) |

## 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 |
| Lifetime Subscription Electro | $99.99 | one-time |


### Opterra Cortex

[App page](https://appshunter.io/ios/app/opterra-cortex/id6760212456)

**Features:** macOS Compatibility, 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 Opterra Cortex free?

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

### Do Electrical Engineering or Opterra Cortex have ads?

Electrical Engineering shows ads; Opterra Cortex does not.

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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.*