# x36 vs HP

The clearest difference is price: HP at Free against x36's $0.99. HP also leads on update cadence (every 11 days vs every 2 months) and ratings volume (5 vs 1). x36's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 17.2). On rating, review sentiment, ads and in-app purchases there is nothing between them.

HP is free to download; x36 costs $0.99 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 — 5.0 for x36 against 5.0 for HP. That said, the two scores are not equally well evidenced: HP has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

x36 ships an update every 2 months, HP every 11 days. Both last shipped on October 8, 2026.

## The numbers

| Metric | x36 | HP |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/x36/id1443849416/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/hp-35/id6738010641/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 11 days** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 2 MB |
| Requires iOS | **12.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Carl Cook](https://appshunter.io/developer/897666025) | [Enrique Haro](https://appshunter.io/developer/1778874870) |

## What reviewers say

### x36

[App page](https://appshunter.io/ios/app/x36/id1443849416)

This app offers a powerful scientific and engineering calculator with advanced features like programmability, multiple number bases, and statistical functions. It emulates the functionality of calculators from the 70s and 80s, providing over 100 functions for complex calculations.

**Highlights:** Programmability with 1000 steps, Trigonometric functions with selectable units, Statistical functions and linear regression, Four number bases (Decimal, Hex, Octal, Binary), Metric-English conversions, Fraction operations, Over 100 functions

**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 x36 free?

x36 costs $0.99, with no in-app purchases.

### Is HP free?

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

### Which has better reviews, x36 or HP?

x36 and HP are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do x36 or HP have ads?

Neither x36 nor HP shows ads.

### Which is updated more often, x36 or HP?

x36 ships an update every 2 months, and HP every 11 days. Most recently, x36 was updated on October 8, 2026 and HP on October 8, 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.*