# RPN vs DB40X

The clearest difference is update cadence: DB40X at every 3 weeks against RPN's every 9 months. DB40X also leads on device support (3 vs 1). RPN's advantage is rating (5.0 vs 4.7) and iOS requirement (12.0 vs 14.0). On price, review sentiment, 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.

RPN holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 7 respectively. Written reviews point the same way: 83% of RPN's written reviews are positive against 78% of DB40X's.

RPN ships an update every 9 months, DB40X every 3 weeks. Both last shipped on November 4, 2026.

## The numbers

| Metric | RPN | DB40X |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/rpn-70-hd/id436127144/reviews)** | [4.7 (7 ratings)](https://appshunter.io/ios/app/db40x/id6624315901/reviews) |
| Number of ratings | 3 | **7** |
| Positive reviews | **83.3% of reviews** | 77.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 14 MB | 7 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPad | **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-hd/id436127144)

This app provides a photo-realistic simulation of a rare 1974 financial calculator, offering full functionality for loan amortization, saving plans, and depreciation. It features an authentic design with animated keys and an optional live register view.

**Highlights:** Photo-realistic design, Live register view, Animated keys with sound, Full HP-70 function implementation, Cut/copy/paste display value, Built-in manual with examples

**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, Vision Pro support

**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?

RPN is rated higher. RPN averages 5.0 out of 5 from 3 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 9 months, and DB40X every 3 weeks. Most recently, RPN was updated on November 4, 2026 and DB40X on November 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.*