# RPN vs DB40X

RPN and DB40X both sit at 4.7 stars, but that hides the real split: 100% of RPN's written reviews are positive against 67% of DB40X's. RPN also leads on iOS requirement (12.0 vs 14.0). DB40X's advantage is update cadence (every 3 weeks vs every 7 months). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.7 for RPN against 4.7 for DB40X. Both are backed by a comparable volume of ratings — 11 and 7 respectively. Written reviews are what separate them: 100% of RPN's written reviews are positive against 67% of DB40X's.

RPN ships an update every 7 months, DB40X every 3 weeks. The most recent releases landed on August 26, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | RPN | DB40X |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (11 ratings)](https://appshunter.io/ios/app/rpn-70-sd/id738422213/reviews) | **[4.7 (7 ratings)](https://appshunter.io/ios/app/db40x/id6624315901/reviews)** |
| Number of ratings | **11** | 7 |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 17 MB | 7 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Christophe de Dinechin](https://appshunter.io/developer/1761608161) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-70-sd/id738422213)

This app is a faithful simulation of a rare 1974 financial calculator, offering all its original functions with enhanced features like more memory registers and a visual stack display. It's designed for users who appreciate vintage technology and need precise financial calculations.

**Highlights:** Photo-realistic vintage calculator design, Full HP-70 function simulation, Animated keys with sound, Enhanced stack and memory register view, Cut/copy/paste display value, Input parameter visual indicators

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

**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 RPN free?

RPN 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, RPN or DB40X?

DB40X is rated higher. RPN averages 4.7 out of 5 from 11 ratings, while DB40X averages 4.7 from 7 ratings.

### Do RPN or DB40X have ads?

Neither RPN nor DB40X shows ads.

### Which is updated more often, RPN or DB40X?

RPN ships an update every 7 months, and DB40X every 3 weeks. Most recently, RPN was updated on August 26, 2026 and DB40X on June 4, 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.*