# RPN vs Operational Amplifiers Pro

The clearest difference is ratings volume: RPN at 11 against Operational Amplifiers Pro's 1. RPN also leads on iOS requirement (12.0 vs 17.0). Operational Amplifiers Pro's advantage is device support (3 vs 1). On price, rating, update cadence and ads there is nothing between them.

RPN costs $4.99 and Operational Amplifiers Pro $4.99 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 — 4.9 for RPN against 5.0 for Operational Amplifiers Pro. That said, the two scores are not equally well evidenced: RPN has 11 ratings behind it against 1, so its average is the more settled of the two.

RPN ships an update every 3 months, Operational Amplifiers Pro every 2 months. The most recent releases landed on October 20, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | RPN | Operational Amplifiers Pro |
| --- | --- | --- |
| Price | $4.99 | $4.99 |
| Rating | [4.9 (11 ratings)](https://appshunter.io/ios/app/rpn-97-pro/id816249055/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953/reviews)** |
| Number of ratings | **11** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 75 MB | 14 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-97-pro/id816249055)

This app simulates a legendary 1970s programmable calculator, offering advanced features for scientists and engineers. It allows users to run programs, manage virtual cards, and access hundreds of free program cards from its website.

**Highlights:** Virtual program and data cards, Virtual paper tape printer, Database-driven card manager, Create, label, and organize unlimited cards, Effortless saving of card collections, Formatted program listings, Live display of stack and registers

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is RPN free?

RPN costs $4.99, 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, RPN or Operational Amplifiers Pro?

Operational Amplifiers Pro is rated higher. RPN averages 4.9 out of 5 from 11 ratings, while Operational Amplifiers Pro averages 5.0 from 1 ratings.

### Do RPN or Operational Amplifiers Pro have ads?

Neither RPN nor Operational Amplifiers Pro shows ads.

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

RPN ships an update every 3 months, and Operational Amplifiers Pro every 2 months. Most recently, RPN was updated on October 20, 2026 and Operational Amplifiers Pro on October 19, 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.*