# Operational Amplifiers Pro vs QR code

The clearest difference is update cadence: QR code at every 6 days against Operational Amplifiers Pro's every 2 months. QR code also leads on price ($0.99 vs $4.99) and chart position (#190 vs unranked). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Operational Amplifiers Pro costs $4.99 and QR code $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Operational Amplifiers Pro against 5.0 for QR code. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Operational Amplifiers Pro ships an update every 2 months, QR code every 6 days. The most recent releases landed on October 1, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Operational Amplifiers Pro | QR code |
| --- | --- | --- |
| Price | $4.99 | **$0.99** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/qr-code-scanner-and-creator/id6475224664/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#190** |
| Size | 14 MB | 1 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [Le Vu](https://appshunter.io/developer/888757091) |

## What reviewers say

### Operational Amplifiers Pro

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

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


### QR code

[App page](https://appshunter.io/ios/app/qr-code-scanner-and-creator/id6475224664)

**Currently charting:** #190 Top Paid · Utilities (US App Store)

Easily scan, create, and manage QR codes and barcodes. Supports numerous formats and allows for effortless organization, export, and sharing of your codes.

**Highlights:** Effortless QR code and barcode scanning, Create various QR code types, Supports extensive format compatibility, Comprehensive code management, Export codes in TXT or CSV, Share codes easily

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Operational Amplifiers Pro free?

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

### Is QR code free?

QR code costs $0.99, with no in-app purchases.

### Which has better reviews, Operational Amplifiers Pro or QR code?

Operational Amplifiers Pro and QR code are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Operational Amplifiers Pro or QR code have ads?

Neither Operational Amplifiers Pro nor QR code shows ads.

### Which is updated more often, Operational Amplifiers Pro or QR code?

Operational Amplifiers Pro ships an update every 2 months, and QR code every 6 days. Most recently, Operational Amplifiers Pro was updated on October 1, 2026 and QR code on September 23, 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.*