# bcRPN vs HP

The clearest difference is update cadence: HP at every 11 days against bcRPN's every 22 months. HP also leads on review sentiment (100% vs 80%) and rating (5.0 vs 4.8). bcRPN's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.2). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

HP holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 4 and 5 respectively. Written reviews point the same way: 80% of bcRPN's written reviews are positive against 100% of HP's.

bcRPN ships an update every 22 months, HP every 11 days. The most recent releases landed on September 19, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | bcRPN | HP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4 ratings)](https://appshunter.io/ios/app/bcrpn/id1614744829/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/hp-35/id6738010641/reviews)** |
| Number of ratings | 4 | **5** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 11 days** |
| Monetization | Free | Free |
| Size | 0 MB | 2 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Paul Wilkins](https://appshunter.io/developer/1614739840) | [Enrique Haro](https://appshunter.io/developer/1778874870) |

## 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


### HP

[App page](https://appshunter.io/ios/app/hp-35/id6738010641)

Emulates classic Hewlett Packard RPN scientific calculators from the 1970s. Experience the original HP-35, HP-45, and HP-21 models on your iPhone.

**Highlights:** RPN calculator emulation, HP-35 model, HP-45 model, HP-21 model, Classic scientific calculator interface

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

**In-app purchases:** none


## Frequently asked questions

### Is bcRPN free?

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

### Is HP free?

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

### Which has better reviews, bcRPN or HP?

HP is rated higher. bcRPN averages 4.8 out of 5 from 4 ratings, while HP averages 5.0 from 5 ratings.

### Do bcRPN or HP have ads?

Neither bcRPN nor HP shows ads.

### Which is updated more often, bcRPN or HP?

bcRPN ships an update every 22 months, and HP every 11 days. Most recently, bcRPN was updated on September 19, 2026 and HP on September 21, 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.*