# HP vs HP16C

HP and HP16C are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 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 HP against 5.0 for HP16C. Both are backed by a comparable volume of ratings — 5 and 2 respectively.

HP ships an update every 11 days, HP16C every 8 days. Both last shipped on September 21, 2026.

## The numbers

| Metric | HP | HP16C |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/hp-35/id6738010641/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/hp16c/id6761774728/reviews) |
| Number of ratings | **5** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 days | **Every 8 days** |
| Monetization | Free | Free |
| Size | 2 MB | 1 MB |
| Requires iOS | 17.2 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Enrique Haro](https://appshunter.io/developer/1778874870) | [Michael Doornbos](https://appshunter.io/developer/1891405652) |

## What reviewers say

### 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


### HP16C

[App page](https://appshunter.io/ios/app/hp16c/id6761774728)

This app faithfully recreates the legendary HP 16C Computer Scientist calculator, offering advanced hex arithmetic, bit manipulation, and base conversion. It features RPN, keystroke programming, and modern enhancements like a two-line display and haptic feedback.

**Highlights:** Full RPN calculator, Integer arithmetic (HEX, DEC, OCT, BIN), Configurable word size (1-64 bits), Complete bit operations, Keystroke programming, Two-line display, Haptic feedback

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HP free?

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

### Is HP16C free?

HP16C is free to download, with no in-app purchases.

### Which has better reviews, HP or HP16C?

HP and HP16C are both rated 5.0 out of 5 on the App Store, from 5 and 2 ratings respectively.

### Do HP or HP16C have ads?

Neither HP nor HP16C shows ads.

### Which is updated more often, HP or HP16C?

HP ships an update every 11 days, and HP16C every 8 days. Most recently, HP was updated on September 21, 2026 and HP16C 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.*