# Unit Converter ∞ vs |RPN| Scientific Calculator

The clearest difference is rating: Unit Converter ∞ at 4.4 against |RPN| Scientific Calculator's 2.3. Unit Converter ∞ also leads on ratings volume (243 vs 3) and review sentiment (76% vs 60%). |RPN| Scientific Calculator's advantage is update cadence (fortnightly vs every 9 months) and price ($0.99 vs $2.99). On ads, in-app purchases and device support there is nothing between them.

Unit Converter ∞ costs $2.99 and |RPN| Scientific Calculator $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Unit Converter ∞ holds the better App Store score, 4.4 against 2.3. That said, the two scores are not equally well evidenced: Unit Converter ∞ has 243 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 76% of Unit Converter ∞'s written reviews are positive against 60% of |RPN| Scientific Calculator's.

Unit Converter ∞ ships an update every 9 months, |RPN| Scientific Calculator fortnightly. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Unit Converter ∞ | |RPN| Scientific Calculator |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | **[4.4 (243 ratings)](https://appshunter.io/ios/app/unit-converter/id539102182/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997/reviews) |
| Number of ratings | **243** | 3 |
| Positive reviews | **75.8% of reviews** | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | **Free** | Paid |
| Size | 19 MB | 2 MB |
| Requires iOS | **8.0** | 16 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Incpt.Mobis](https://appshunter.io/developer/445261166) | [Bradley Smith](https://appshunter.io/developer/1069467996) |

## What reviewers say

### Unit Converter ∞

[App page](https://appshunter.io/ios/app/unit-converter/id539102182)

This app offers a comprehensive unit conversion experience with a vast database of over 1000 units across 50 categories. It supports mixed units, custom unit creation, and provides a unique, visually appealing interface for all your conversion needs.

**Highlights:** 50+ Categories & 1000+ Units, Create your own unit, Mixed-unit Support, Currency Exchange, Price Conversion, Widget Support

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Comprehensive unit conversions
- 👍 Visually appealing interface
- 💡 Highly customizable
- 🚀 Powerful and accurate

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 👎 Steep learning curve
- 👎 Confusing or non-intuitive navigation
- 🕰️ Slow performance on older devices

**Reported bugs**

- Incorrect unit conversions for some measurements
- Compatibility issues with newer iOS versions

**Requested features**

- Add support for more currencies
- Improve search and navigation
- Provide a list-based interface option
- Add a number base converter


### |RPN| Scientific Calculator

[App page](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997)

This calculator app uses Reverse Polish Notation for powerful calculations. It offers customizable color schemes, layouts, and online help, designed for flexibility and usability. All features are unlocked with a one-time purchase.

**Highlights:** Reverse Polish Notation (RPN), Viewable stack, Selectable portrait/landscape layouts, Customizable color schemes, Online visual help, No ads or in-app purchases

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter ∞ free?

Unit Converter ∞ costs $2.99, with no in-app purchases.

### Is |RPN| Scientific Calculator free?

|RPN| Scientific Calculator costs $0.99, with no in-app purchases.

### Which has better reviews, Unit Converter ∞ or |RPN| Scientific Calculator?

Unit Converter ∞ is rated higher. Unit Converter ∞ averages 4.4 out of 5 from 243 ratings, while |RPN| Scientific Calculator averages 2.3 from 3 ratings.

### Do Unit Converter ∞ or |RPN| Scientific Calculator have ads?

Neither Unit Converter ∞ nor |RPN| Scientific Calculator shows ads.

### Which is updated more often, Unit Converter ∞ or |RPN| Scientific Calculator?

Unit Converter ∞ ships an update every 9 months, and |RPN| Scientific Calculator fortnightly. Most recently, Unit Converter ∞ was updated on October 29, 2026 and |RPN| Scientific Calculator on October 24, 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.*