# RPN Memory Calculator vs DeepSpace

The clearest difference is price: RPN Memory Calculator at Free against DeepSpace's $0.99. RPN Memory Calculator also leads on iOS requirement (11.3 vs 26.0). DeepSpace's advantage is in-app purchases (none vs 1) and update cadence (every 5 days vs every 4 months). On ads and device support there is nothing between them.

RPN Memory Calculator is free to download; DeepSpace costs $0.99 up front. RPN Memory Calculator sells 1 one-off in-app purchase. DeepSpace asks for nothing beyond the download.

RPN Memory Calculator ships an update every 4 months, DeepSpace every 5 days. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | RPN Memory Calculator | DeepSpace |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/deepspace-starviewer/id6790279077/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | **Free** | Paid |
| Size | 8 MB | 4 MB |
| Requires iOS | **11.3** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Neverest Limited](https://appshunter.io/developer/1360645388) | [Alexandr Garlock Development House LLC](https://appshunter.io/developer/353093375) |

## 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 |


### DeepSpace

[App page](https://appshunter.io/ios/app/deepspace-starviewer/id6790279077)

Explore the night sky with a real-time star map. Identify stars, planets, constellations, and deep-sky objects by simply pointing your device. Features include a sky search, time machine, and observation journal.

**Highlights:** Gyroscope sky map, 16 constellations with mythology, 110 Messier objects, Tap to lock on celestial objects, Sky search and jump, Tonight's Sky view, Time Machine for planning, Observation journal

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**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 DeepSpace free?

DeepSpace costs $0.99, with no in-app purchases.

### Do RPN Memory Calculator or DeepSpace have ads?

Neither RPN Memory Calculator nor DeepSpace shows ads.

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

RPN Memory Calculator ships an update every 4 months, and DeepSpace every 5 days. Most recently, RPN Memory Calculator was updated on October 24, 2026 and DeepSpace on October 11, 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.*