# RPN vs Unit Converter

The clearest difference is price: Unit Converter at Free against RPN's $4.99. RPN's advantage is rating (4.9 vs 1.0) and update cadence (every 3 months vs every 13 months). On ads, in-app purchases and device support there is nothing between them.

Unit Converter is free to download; RPN costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RPN holds the better App Store score, 4.9 against 1.0. 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, Unit Converter every 13 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | RPN | Unit Converter |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.9 (11 ratings)](https://appshunter.io/ios/app/rpn-97-pro/id816249055/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/unit-converter-convertly/id6739451660/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 13 months |
| Monetization | Paid | **Free** |
| Size | 75 MB | 0 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Maarten Borsje](https://appshunter.io/developer/1650073735) |

## 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


### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-convertly/id6739451660)

Easily switch between metric and imperial measurements for length, area, mass, temperature, and more. This tool offers quick, accurate conversions with an intuitive interface and offline functionality.

**Highlights:** 15+ unit categories, Metric and imperial support, Quick and precise conversions, Intuitive interface, Conversion history, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $4.99, with no in-app purchases.

### Is Unit Converter free?

Unit Converter is free to download, with no in-app purchases.

### Which has better reviews, RPN or Unit Converter?

RPN is rated higher. RPN averages 4.9 out of 5 from 11 ratings, while Unit Converter averages 1.0 from 1 ratings.

### Do RPN or Unit Converter have ads?

Neither RPN nor Unit Converter shows ads.

### Which is updated more often, RPN or Unit Converter?

RPN ships an update every 3 months, and Unit Converter every 13 months. Most recently, RPN was updated on November 1, 2026 and Unit Converter on November 4, 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.*