# Halcyon Calc Lite vs HP

The clearest difference is review sentiment: HP at 100% against Halcyon Calc Lite's 43%. HP also leads on in-app purchases (none vs 3) and ads (none vs shown). Halcyon Calc Lite's advantage is ratings volume (15 vs 5). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Halcyon Calc Lite sells 3 one-off in-app purchases. HP asks for nothing beyond the download.

HP holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 15 and 5 respectively. Written reviews point the same way: 43% of Halcyon Calc Lite's written reviews are positive against 100% of HP's.

Halcyon Calc Lite ships an update every 3 months, HP every 11 days. The most recent releases landed on August 29, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Halcyon Calc Lite | HP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (15 ratings)](https://appshunter.io/ios/app/halcyon-calc-lite/id408004888/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/hp-35/id6738010641/reviews)** |
| Number of ratings | **15** | 5 |
| Positive reviews | 42.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 11 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 13 MB | 2 MB |
| Requires iOS | **16.6** | 17.2 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Halcyon Touch Software](https://appshunter.io/developer/327064662) | [Enrique Haro](https://appshunter.io/developer/1778874870) |

## What reviewers say

### Halcyon Calc Lite

[App page](https://appshunter.io/ios/app/halcyon-calc-lite/id408004888)

This app is a powerful calculator for students and professionals, offering advanced features like symbolic expression manipulation, graphing, and statistical analysis. It supports real, complex, and integer numbers, matrices, and vectors, making it versatile for various mathematical tasks.

**Highlights:** Symbolic expression manipulation, Graphing of expressions, Matrix and vector calculations, Statistical analysis, Multiple number formats (decimal, hex, octal, binary), Over 225 built-in operations

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Directory And Unit Conversion Support | $0.99 | one-time |
| Programming Support | $1.99 | one-time |
| Larger Display Upgrade | $1.99 | one-time |


### 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 Halcyon Calc Lite free?

Halcyon Calc Lite is free to download, with in-app purchases available.

### Is HP free?

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

### Which has better reviews, Halcyon Calc Lite or HP?

HP is rated higher. Halcyon Calc Lite averages 4.7 out of 5 from 15 ratings, while HP averages 5.0 from 5 ratings.

### Do Halcyon Calc Lite or HP have ads?

Halcyon Calc Lite shows ads; HP does not.

### Which is updated more often, Halcyon Calc Lite or HP?

Halcyon Calc Lite ships an update every 3 months, and HP every 11 days. Most recently, Halcyon Calc Lite was updated on August 29, 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.*