HP 15c Calculator vs Impact Data Board
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HP 15c Calculator
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.
- Official HP 15c emulator
- RPN (Reverse Polish Notation)
- Matrix calculations
- Complex functions
- Numerical integration
- Programmable (448 lines)
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Meet the next generation of your favorite scientific calculator. The official HP 15c app, now brings a completely redesigned interface, a modern look, and improved functionality—while preserving the precision and reliability trusted by professionals for decades. This RPN calculator offers the features, algorithms and calculation sequences of the original 15c Scientific Calculator conveniently stored on your iPhone or iPad. The HP 15c You Know – Now Better Than Ever • Official emulator of legendary calculator device by HP • Identical algorithms, layout, and keystrokes as the original HP 15c • RPN (Reverse Polish Notation) for fast and efficient input • Matrix calculations, Complex functions, Numerical integration. • Ideal for math and engineering students and professionals • Programmable – up to 448 lines Be Ready. Anywhere. Anytime. Whether you’re in class, at the office, or on the go, HP 15c is ready when you are. Just launch the app on your iPhone and get to work. Download HP 15c today and experience the perfect blend of classic functionality and modern design.
Impact Data Board
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.
- 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
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The Impact Data Board is designed by shooters for shooters. Our digital data board allows shooters the flexibility to create detailed and unique ways for setting up your ballistic data for competition, hunting, recreational shooting, or for military and operational deployments. Our board is battery free so no need to charge it. This application offers numerous menu driven drop downs that will allow you to quickly and easily setup your data. This application allows you the freedom to customize the data that is displayed on your board. The Impact Data Board offers up to seven columns and 18 rows of data specific information that can be toggled on or off per your specific needs. You can purchase your digital boards on our website.
Screenshots
Verdict
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 (220 vs 7). On rating, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 220 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 10, 2026 and November 4, 2026 respectively.
| Parameter | HP 15c Calculator | Impact Data Board |
|---|---|---|
| Price | $14.99 | Free — better |
| Rating | 4.8 (220 ratings) | 5.0 (7 ratings) — better |
| Positive reviews | 68.2% of reviews | 100.0% of reviews — better |
| Number of ratings | 220 — better | 7 |
| Update frequency | Every 16 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 45 MB | 6 MB |
| Age rating | 4+ | 17+ |
| Developer | MORAVIA Consulting, spol. s r.o. | Impact Data Books Inc. |
Customer experience
HP 15c Calculator
Impact Data Board
Bugs and requests
HP 15c Calculator
Reported bugs
3 issues- Numbers not aligned in display window
- Display flashing after running programs
- Incompatibility with latest iOS versions
Requested features
4 requests- Copy and paste functionality
- Ability to change calculator models
- Option to disable button click sound
- Better support for larger iPhone screens
Impact Data Board
Not enough reviews yet to summarise bugs or requests.
In-app purchases
HP 15c Calculator
No in-app purchases
Impact Data Board
No in-app purchases
Questions
Is HP 15c Calculator free?
Is Impact Data Board free?
Which has better reviews, HP 15c Calculator or Impact Data Board?
Do HP 15c Calculator or Impact Data Board have ads?
Which is updated more often, HP 15c Calculator or Impact Data Board?
Other comparisons
