# Z3 Control 2 vs Operational Amplifiers Pro

The clearest difference is price: Z3 Control 2 at Free against Operational Amplifiers Pro's $4.99. Z3 Control 2 also leads on ratings volume (5 vs 1) and iOS requirement (12.0 vs 17.0). Operational Amplifiers Pro's advantage is rating (5.0 vs 1.0) and chart position (#198 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Z3 Control 2 is free to download; Operational Amplifiers Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Operational Amplifiers Pro holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Z3 Control 2 has 5 ratings behind it against 1, so its average is the more settled of the two.

Z3 Control 2 ships an update every 4 months, Operational Amplifiers Pro every 2 months. The most recent releases landed on October 16, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Z3 Control 2 | Operational Amplifiers Pro |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [1.0 (5 ratings)](https://appshunter.io/ios/app/z3-control-2/id1612097769/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#198** |
| Size | 18 MB | 14 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [ELAC Americas Inc.](https://appshunter.io/developer/1547394447) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Z3 Control 2

[App page](https://appshunter.io/ios/app/z3-control-2/id1612097769)

Adjust speaker volume, enhance bass, and connect your device to a wireless network. This utility also allows you to check for and install speaker firmware updates to access new features.

**Highlights:** Adjust speaker volume, Enhance bass, Wireless network setup, Check for firmware updates, Install new features

**Features:** macOS Compatibility

**In-app purchases:** none


### Operational Amplifiers Pro

[App page](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953)

**Currently charting:** #198 Top Paid · Utilities (US App Store)

This app provides interactive calculators and reference information for designing and analyzing op-amp circuits. It offers step-by-step explanations and technical data on popular op-amp series, aiding students and engineers in circuit development and prototyping.

**Highlights:** Interactive op-amp circuit calculators, Step-by-step explanations and formulas, Reference data on op-amps and comparators, Support for 14 languages, Light and dark mode, Advanced calculators and circuit guides (Pro), Full-text search (Pro)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Z3 Control 2 free?

Z3 Control 2 is free to download, with no in-app purchases.

### Is Operational Amplifiers Pro free?

Operational Amplifiers Pro costs $4.99, with no in-app purchases.

### Which has better reviews, Z3 Control 2 or Operational Amplifiers Pro?

Operational Amplifiers Pro is rated higher. Z3 Control 2 averages 1.0 out of 5 from 5 ratings, while Operational Amplifiers Pro averages 5.0 from 1 ratings.

### Do Z3 Control 2 or Operational Amplifiers Pro have ads?

Neither Z3 Control 2 nor Operational Amplifiers Pro shows ads.

### Which is updated more often, Z3 Control 2 or Operational Amplifiers Pro?

Z3 Control 2 ships an update every 4 months, and Operational Amplifiers Pro every 2 months. Most recently, Z3 Control 2 was updated on October 16, 2026 and Operational Amplifiers Pro on October 12, 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.*