# Spacer vs Stackis RPN

The clearest difference is in-app purchases: Spacer at none against Stackis RPN's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Stackis RPN sells 1 one-off in-app purchase. Spacer asks for nothing beyond the download.

## The numbers

| Metric | Spacer | Stackis RPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stackis-rpn/id6752929114/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Monetization | — | Free |
| Size | 95 MB | 10 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bogdan Gavriluta](https://appshunter.io/developer/1584690995) | [Skimra](https://appshunter.io/developer/403502071) |

## What reviewers say

### Spacer

[App page](https://appshunter.io/ios/app/spacer-invisible-widgets/id6519864849)

**In-app purchases:** none


### Stackis RPN

[App page](https://appshunter.io/ios/app/stackis-rpn/id6752929114)

A calculator designed for users who prefer Reverse Polish Notation (RPN). It offers a familiar interface for RPN users and includes support for duodecimal calculations.

**Highlights:** RPN calculation style, Duodecimal (dozenal) support, Familiar interface for RPN users, Simple and pleasant user experience

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Mode | $1.99 | one-time |


## Frequently asked questions

### Is Spacer free?

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

### Is Stackis RPN free?

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

### Do Spacer or Stackis RPN have ads?

Neither Spacer nor Stackis RPN shows ads.

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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.*