# Electrical Engineering vs H2O Activa

The clearest difference is in-app purchases: H2O Activa at none against Electrical Engineering's 8. H2O Activa also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.5). On price, update cadence and device support there is nothing between them.

Both are free to download. Electrical Engineering sells 7 in-app purchases, starting at $3.99 per month. H2O Activa asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 22, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Electrical Engineering | H2O Activa |
| --- | --- | --- |
| 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 | **No** |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 115 MB | 30 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlo Terracciano](https://appshunter.io/developer/1159639539) | [Frexis SpA](https://appshunter.io/developer/1530978160) |

## 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 |


### H2O Activa

[App page](https://appshunter.io/ios/app/h2o-activa/id1537420343)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Electrical Engineering free?

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

### Is H2O Activa free?

H2O Activa is free to download, with no in-app purchases.

### Do Electrical Engineering or H2O Activa have ads?

Electrical Engineering shows ads; H2O Activa does not.

### Which is updated more often, Electrical Engineering or H2O Activa?

Electrical Engineering ships an update every 2 months, and H2O Activa every 2 months. Most recently, Electrical Engineering was updated on October 22, 2026 and H2O Activa on October 27, 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.*