# Stack RPN Calculator vs DB40X

The clearest difference is rating: DB40X at 4.7 against Stack RPN Calculator's 3.5. DB40X also leads on review sentiment (67% vs 33%) and ratings volume (7 vs 2). Stack RPN Calculator's advantage is iOS requirement (11.0 vs 14.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DB40X holds the better App Store score, 4.7 against 3.5. Both are backed by a comparable volume of ratings — 2 and 7 respectively. Written reviews point the same way: 33% of Stack RPN Calculator's written reviews are positive against 67% of DB40X's.

## The numbers

| Metric | Stack RPN Calculator | DB40X |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697/reviews) | **[4.7 (7 ratings)](https://appshunter.io/ios/app/db40x/id6624315901/reviews)** |
| Number of ratings | 2 | **7** |
| Positive reviews | 33.3% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 3 weeks |
| Monetization | Free | Free |
| Size | 10 MB | 7 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dario Bersiga](https://appshunter.io/developer/668388549) | [Christophe de Dinechin](https://appshunter.io/developer/1761608161) |

## What reviewers say

### Stack RPN Calculator

[App page](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697)

This scientific calculator displays major functions on screen and utilizes a stack for calculations. It supports a stack of up to 4 values but can store many more numbers depending on device memory.

**Highlights:** Visible scientific functions, RPN (Reverse Polish Notation) input, Stack display for up to 4 values, Large number storage capacity, Designed for iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases:** none


### DB40X

[App page](https://appshunter.io/ios/app/db40x/id6624315901)

A high-precision scientific calculator inspired by the HP48 series, offering arbitrary precision computations, complex numbers, vectors, matrices, and graphing. It supports RPN and algebraic operations, with over 1000 built-in functions and a hyperlinked help system.

**Highlights:** Arbitrary precision computations, RPN and algebraic operations, Complex numbers, vectors, and matrices, Graphing and plotting, Engineering units and conversions, Hyperlinked help system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Stack RPN Calculator free?

Stack RPN Calculator is free to download, with no in-app purchases.

### Is DB40X free?

DB40X is free to download, with no in-app purchases.

### Which has better reviews, Stack RPN Calculator or DB40X?

DB40X is rated higher. Stack RPN Calculator averages 3.5 out of 5 from 2 ratings, while DB40X averages 4.7 from 7 ratings.

### Do Stack RPN Calculator or DB40X have ads?

Neither Stack RPN Calculator nor DB40X 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.*