# Plus42 vs HP

The clearest difference is price: HP at Free against Plus42's $9.99. Plus42's advantage is ratings volume (79 vs 5) and chart position (#180 vs unranked). On rating, review sentiment, update cadence and ads there is nothing between them.

HP is free to download; Plus42 costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Plus42 against 5.0 for HP. That said, the two scores are not equally well evidenced: Plus42 has 79 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 92% of Plus42's written reviews are positive against 100% of HP's.

Plus42 ships an update weekly, HP every 11 days. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Plus42 | HP |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [4.9 (79 ratings)](https://appshunter.io/ios/app/plus42/id1597963622/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/hp-35/id6738010641/reviews)** |
| Number of ratings | **79** | 5 |
| Positive reviews | 92.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | Free | Free |
| Best chart rank | **#180** | — |
| Size | 11 MB | 2 MB |
| Requires iOS | **12.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Okken](https://appshunter.io/developer/337692632) | [Enrique Haro](https://appshunter.io/developer/1778874870) |

## What reviewers say

### Plus42

[App page](https://appshunter.io/ios/app/plus42/id1597963622)

**Currently charting:** #180 Top Paid · Utilities (US App Store)

This advanced scientific calculator simulates the classic HP-42S RPN calculator with enhanced features. It offers algebraic expressions, unit conversions, directories for storage, a larger resizable display, financial functions, and 2D plotting with integral and root finding.

**Highlights:** HP-42S RPN calculator simulation, Algebraic expressions, Attached units and conversions, Program and variable directories, Resizable 8-row, 22-column display, Time value of money and amortization, 2D function plotting with zoom and pan

**Features:** Vision Pro support

**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 Plus42 free?

Plus42 costs $9.99, with no in-app purchases.

### Is HP free?

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

### Which has better reviews, Plus42 or HP?

HP is rated higher. Plus42 averages 4.9 out of 5 from 79 ratings, while HP averages 5.0 from 5 ratings.

### Do Plus42 or HP have ads?

Neither Plus42 nor HP shows ads.

### Which is updated more often, Plus42 or HP?

Plus42 ships an update weekly, and HP every 11 days. Most recently, Plus42 was updated on September 22, 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.*