# Operational Amplifiers Guide vs Electrical Engineering Toolkit

The clearest difference is in-app purchases: Operational Amplifiers Guide at none against Electrical Engineering Toolkit's 3. Operational Amplifiers Guide also leads on update cadence (every 2 months vs every 9 months). Electrical Engineering Toolkit's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Electrical Engineering Toolkit sells 3 in-app purchases, starting at $0.99 per month. Operational Amplifiers Guide asks for nothing beyond the download.

Operational Amplifiers Guide ships an update every 2 months, Electrical Engineering Toolkit every 9 months. The most recent releases landed on September 19, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Operational Amplifiers Guide | Electrical Engineering Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 9 months |
| Size | 17 MB | 12 MB |
| Requires iOS | **16.0** | 16.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [Vladislav Zhirnov](https://appshunter.io/developer/1476188065) |

## What reviewers say

### Operational Amplifiers Guide

[App page](https://appshunter.io/ios/app/operational-amplifiers-guide/id6467499897)

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

**In-app purchases:** none


### Electrical Engineering Toolkit

[App page](https://appshunter.io/ios/app/electrical-engineering-toolkit/id6474202026)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version / monthly | $0.99 | per month |
| Full version / year | $3.99 | per year |
| Support project, remove ADS | $5.99 | one-time |


## Frequently asked questions

### Is Operational Amplifiers Guide free?

Operational Amplifiers Guide is free to download, with no in-app purchases.

### Is Electrical Engineering Toolkit free?

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

### Do Operational Amplifiers Guide or Electrical Engineering Toolkit have ads?

Operational Amplifiers Guide shows ads; Electrical Engineering Toolkit does not.

### Which is updated more often, Operational Amplifiers Guide or Electrical Engineering Toolkit?

Operational Amplifiers Guide ships an update every 2 months, and Electrical Engineering Toolkit every 9 months. Most recently, Operational Amplifiers Guide was updated on September 19, 2026 and Electrical Engineering Toolkit on September 10, 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.*