# RPN Calculus vs ReadableCalc

The clearest difference is price: ReadableCalc at Free against RPN Calculus's $1.99. ReadableCalc also leads on update cadence (weekly vs every 4 months) and device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

ReadableCalc is free to download; RPN Calculus costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RPN Calculus ships an update every 4 months, ReadableCalc weekly. The most recent releases landed on September 28, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RPN Calculus | ReadableCalc |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/rpn-calculus/id374359458/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Paid | — |
| Size | 11 MB | 28 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Braun](https://appshunter.io/developer/296553965) | [YONAGARE LAB](https://appshunter.io/developer/1810986554) |

## What reviewers say

### RPN Calculus

[App page](https://appshunter.io/ios/app/rpn-calculus/id374359458)

This scientific calculator app for iPad offers a clean RPN interface with basic and advanced functions. It supports high precision calculations and provides an extensive, user-extendable database of scientific constants.

**Highlights:** RPN (Reverse Polish Notation) interface, Basic and advanced mathematical functions, High precision calculations (up to 15 digits), Extensive scientific constant database, User-extendable constant database, Memory space for values

**In-app purchases:** none


### ReadableCalc

[App page](https://appshunter.io/ios/app/readablecalc/id6747457253)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RPN Calculus free?

RPN Calculus costs $1.99, with no in-app purchases.

### Is ReadableCalc free?

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

### Do RPN Calculus or ReadableCalc have ads?

Neither RPN Calculus nor ReadableCalc shows ads.

### Which is updated more often, RPN Calculus or ReadableCalc?

RPN Calculus ships an update every 4 months, and ReadableCalc weekly. Most recently, RPN Calculus was updated on September 28, 2026 and ReadableCalc on October 7, 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.*