# HP 15c Calculator vs Impact Data Board

The clearest difference is price: Impact Data Board at Free against HP 15c Calculator's $14.99. Impact Data Board also leads on review sentiment (100% vs 68%) and update cadence (every 6 months vs every 16 months). HP 15c Calculator's advantage is ratings volume (219 vs 7). On rating, ads, in-app purchases and device support there is nothing between them.

Impact Data Board is free to download; HP 15c Calculator costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Impact Data Board holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: HP 15c Calculator has 219 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 68% of HP 15c Calculator's written reviews are positive against 100% of Impact Data Board's.

HP 15c Calculator ships an update every 16 months, Impact Data Board every 6 months. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | HP 15c Calculator | Impact Data Board |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| Rating | [4.8 (219 ratings)](https://appshunter.io/ios/app/hp-15c-calculator/id503720774/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/impact-data-board/id6743683745/reviews)** |
| Number of ratings | **219** | 7 |
| Positive reviews | 68.2% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 6 months** |
| Monetization | Paid | **Free** |
| Size | 45 MB | 6 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [MORAVIA Consulting, spol. s r.o.](https://appshunter.io/developer/1673101600) | [Impact Data Books Inc.](https://appshunter.io/developer/1821646639) |

## What reviewers say

### HP 15c Calculator

[App page](https://appshunter.io/ios/app/hp-15c-calculator/id503720774)

Experience the official emulator of the legendary HP 15c scientific calculator. This app offers a redesigned interface and modern look while preserving the precision and reliability of the original. It features RPN input, matrix calculations, complex functions, and numerical integration for professionals and students.

**Highlights:** Official HP 15c emulator, RPN (Reverse Polish Notation), Matrix calculations, Complex functions, Numerical integration, Programmable (448 lines)

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Excellent emulation of original HP 15C
- 👍 Faithful reproduction of classic calculator
- 👍 Includes original manual
- 👍 Works just like the real thing
- 👍 Vertical layout with key features

**What reviewers complain about**

- 🐛 Display issues in portrait mode
- 🐛 Bugs with programming and trig functions
- 🔇 Loud button click sound
- 💰 Expensive for an app

**Reported bugs**

- Numbers not aligned in display window
- Display flashing after running programs
- Incompatibility with latest iOS versions

**Requested features**

- Copy and paste functionality
- Ability to change calculator models
- Option to disable button click sound
- Better support for larger iPhone screens


### Impact Data Board

[App page](https://appshunter.io/ios/app/impact-data-board/id6743683745)

This digital data board app helps shooters customize ballistic data for various shooting activities. It offers a flexible, battery-free interface with customizable columns and rows for detailed information, designed for competition, hunting, and operational use.

**Highlights:** Customizable ballistic data setup, Battery-free operation, Menu-driven dropdowns for quick setup, Up to seven columns and 18 rows, Toggleable data information, Designed for competition and hunting

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HP 15c Calculator free?

HP 15c Calculator costs $14.99, with no in-app purchases.

### Is Impact Data Board free?

Impact Data Board is free to download, with no in-app purchases.

### Which has better reviews, HP 15c Calculator or Impact Data Board?

Impact Data Board is rated higher. HP 15c Calculator averages 4.8 out of 5 from 219 ratings, while Impact Data Board averages 5.0 from 7 ratings.

### Do HP 15c Calculator or Impact Data Board have ads?

Neither HP 15c Calculator nor Impact Data Board shows ads.

### Which is updated more often, HP 15c Calculator or Impact Data Board?

HP 15c Calculator ships an update every 16 months, and Impact Data Board every 6 months. Most recently, HP 15c Calculator was updated on November 11, 2026 and Impact Data Board on November 4, 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.*