# RPN vs DB50X

The clearest difference is rating: DB50X at 5.0 against RPN's 4.4. DB50X also leads on update cadence (every 3 weeks vs every 6 months) and review sentiment (100% vs 71%). RPN's advantage is price ($1.99 vs $9.99) and iOS requirement (12.0 vs 14.0). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

RPN costs $1.99 and DB50X $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DB50X holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 14 and 8 respectively. Written reviews point the same way: 71% of RPN's written reviews are positive against 100% of DB50X's.

RPN ships an update every 6 months, DB50X every 3 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | RPN | DB50X |
| --- | --- | --- |
| Price | **$1.99** | $9.99 |
| Rating | [4.4 (14 ratings)](https://appshunter.io/ios/app/rpn-35-sd/id956224485/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/db50x/id6625971367/reviews)** |
| Number of ratings | **14** | 8 |
| Positive reviews | 71.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Best chart rank | **#132** | #143 |
| Size | 14 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-35-sd/id956224485)

**Currently charting:** #132 Top Paid · Productivity (US App Store)

This app emulates the first pocket scientific calculator, offering a photo-realistic vintage experience. It simulates original operating speeds and unique arithmetic bugs, with optional modern enhancements like non-volatile registers.

**Highlights:** Photo-realistic look-and-feel, Multiple vintage skins, Vintage and Enhanced modes, Optional key-click and key-glow, Swipe to correct input, Display stack and memory registers

**Features:** macOS Compatibility

**In-app purchases:** none


### DB50X

[App page](https://appshunter.io/ios/app/db50x/id6625971367)

**Currently charting:** #143 Top Paid · Productivity (US App Store)

This scientific calculator offers high-precision computations with arbitrary precision for numbers. It supports advanced functions like complex numbers, matrices, symbolic calculations, and graphing, with a user-friendly interface and extensive built-in help.

**Highlights:** Arbitrary precision calculations, RPN and algebraic operations, Complex numbers, vectors, matrices, Symbolic and numerical solving, Graphing and plotting, Engineering units and constants, Unicode text support

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

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Is DB50X free?

DB50X costs $9.99, with no in-app purchases.

### Which has better reviews, RPN or DB50X?

DB50X is rated higher. RPN averages 4.4 out of 5 from 14 ratings, while DB50X averages 5.0 from 8 ratings.

### Do RPN or DB50X have ads?

Neither RPN nor DB50X shows ads.

### Which is updated more often, RPN or DB50X?

RPN ships an update every 6 months, and DB50X every 3 weeks. Most recently, RPN was updated on October 29, 2026 and DB50X on October 27, 2026.

### Which is more popular, RPN or DB50X?

RPN currently peaks at #132 in the App Store charts, and DB50X at #143. Chart position reflects recent download velocity rather than total install base.

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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.*