# RPN Memory Calculator vs Standard Notation Calculator

The clearest difference is in-app purchases: Standard Notation Calculator at none against RPN Memory Calculator's 1. RPN Memory Calculator's advantage is update cadence (every 4 months vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RPN Memory Calculator sells 1 one-off in-app purchase. Standard Notation Calculator asks for nothing beyond the download.

RPN Memory Calculator ships an update every 4 months, Standard Notation Calculator every 9 months. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | RPN Memory Calculator | Standard Notation Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free | — |
| Size | 8 MB | 28 MB |
| Requires iOS | 11.3 | **10.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Neverest Limited](https://appshunter.io/developer/1360645388) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### RPN Memory Calculator

[App page](https://appshunter.io/ios/app/rpn-memory-calculator/id1398878075)

This application provides a straightforward reverse Polish notation (RPN) calculator with essential functions and memory operations. It also includes integrated unit conversions for various measurements, allowing for quick conversions directly within the app. The calculator remembers your session, preserving all registers and memory values for future use.

**Highlights:** Reverse Polish Notation (RPN) input, Seven core calculator functions, Memory operations, Integrated unit conversions (Speed, Mass, Temperature, Pressure), Persistent state saving, Three visible registers

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculator Unit Conversions | $0.99 | one-time |


### Standard Notation Calculator

[App page](https://appshunter.io/ios/app/standard-notation-calculator/id1601032021)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RPN Memory Calculator free?

RPN Memory Calculator is free to download, with in-app purchases available.

### Is Standard Notation Calculator free?

Standard Notation Calculator is free to download, with no in-app purchases.

### Do RPN Memory Calculator or Standard Notation Calculator have ads?

Neither RPN Memory Calculator nor Standard Notation Calculator shows ads.

### Which is updated more often, RPN Memory Calculator or Standard Notation Calculator?

RPN Memory Calculator ships an update every 4 months, and Standard Notation Calculator every 9 months. Most recently, RPN Memory Calculator was updated on September 29, 2026 and Standard Notation Calculator on October 1, 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.*