# bcRPN vs CalcStak

The clearest difference is in-app purchases: bcRPN at none against CalcStak's 1. bcRPN also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. CalcStak sells 1 one-off in-app purchase. bcRPN asks for nothing beyond the download.

## The numbers

| Metric | bcRPN | CalcStak |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/bcrpn/id1614744829/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 22 months | — |
| Monetization | Free | — |
| Size | 0 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Paul Wilkins](https://appshunter.io/developer/1614739840) | [JOEL ANDREW ROSINBUM](https://appshunter.io/developer/1896305700) |

## What reviewers say

### bcRPN

[App page](https://appshunter.io/ios/app/bcrpn/id1614744829)

This utility app functions as a Reverse Polish Notation calculator. It handles complex numbers and utilizes extended precision for all calculations, offering an unlimited stack depth and an undo feature for up to 10 operations.

**Highlights:** Reverse Polish Notation (RPN) input, Complex number calculations, Extended precision math, Unlimited stack depth, Undo functionality (up to 10 operations)

**Features:** macOS Compatibility

**In-app purchases:** none


### CalcStak

[App page](https://appshunter.io/ios/app/calcstak/id6766592809)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific Functions | $2.99 | one-time |


## Frequently asked questions

### Is bcRPN free?

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

### Is CalcStak free?

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

### Do bcRPN or CalcStak have ads?

Neither bcRPN nor CalcStak 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.*