# 15C Pro Scientific Calculator vs Plus42

The clearest difference is rating: Plus42 at 4.9 against 15C Pro Scientific Calculator's 3.8. Plus42 also leads on update cadence (every 8 days vs every 3 months) and review sentiment (92% vs 68%). 15C Pro Scientific Calculator's advantage is price ($5.99 vs $9.99) and ratings volume (281 vs 79). On ads, in-app purchases, monetization model and device support there is nothing between them.

15C Pro Scientific Calculator costs $5.99 and Plus42 $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Plus42 holds the better App Store score, 4.9 against 3.8. Both are backed by a comparable volume of ratings — 281 and 79 respectively. Written reviews point the same way: 68% of 15C Pro Scientific Calculator's written reviews are positive against 92% of Plus42's.

15C Pro Scientific Calculator ships an update every 3 months, Plus42 every 8 days. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | 15C Pro Scientific Calculator | Plus42 |
| --- | --- | --- |
| Price | **$5.99** | $9.99 |
| Rating | [3.8 (281 ratings)](https://appshunter.io/ios/app/15c-pro-scientific-calculator/id421102285/reviews) | **[4.9 (79 ratings)](https://appshunter.io/ios/app/plus42/id1597963622/reviews)** |
| Number of ratings | **281** | 79 |
| Positive reviews | 68.1% of reviews | **92.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 8 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#164** |
| Size | 10 MB | 12 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Vicinno Soft LLC](https://appshunter.io/developer/338971050) | [Thomas Okken](https://appshunter.io/developer/337692632) |

## What reviewers say

### 15C Pro Scientific Calculator

[App page](https://appshunter.io/ios/app/15c-pro-scientific-calculator/id421102285)

This app emulates the HP 15C scientific calculator, offering advanced functions like complex numbers, matrix operations, numerical integration, and root finding. It provides the same capabilities as the original hardware with enhanced performance for your mobile device.

**Highlights:** Complex number support, Matrix operations, Numerical integration, Root finder, Programmable, RPN entry, Hyperbolic trig functions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Faithful emulation of original HP-15C
- 👍 Works just like the real calculator
- 💡 Convenient to have on phone
- 🚀 Accurate calculations
- 👍 Familiar RPN interface

**What reviewers complain about**

- 🐛 Crashes on iOS 13 and later
- 🐛 Orientation issues on some devices
- 🐛 Occasional locking up
- 🐛 Display issues in portrait mode
- ⚠️ No longer maintained or updated

**Reported bugs**

- Crashes on launch with iOS 13+
- Displays only half the calculator in portrait mode
- Locking up when accessing the help screen

**Requested features**

- Add haptic feedback on key presses
- Implement program storage and retrieval
- Add support for latest iOS versions


### Plus42

[App page](https://appshunter.io/ios/app/plus42/id1597963622)

**Currently charting:** #164 Top Paid · Utilities (US App Store)

This advanced scientific calculator simulates the HP-42S RPN calculator with enhanced features. It offers algebraic expressions, unit conversions, directory storage, a resizable display, financial functions, and 2D plotting capabilities.

**Highlights:** HP-42S RPN calculator simulation, Algebraic expressions, Attached units and conversions, Directory storage for programs/variables, Resizable 8-row, 22-column display, Time value of money and amortization, 2D function plotting with zoom and pan

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 15C Pro Scientific Calculator free?

15C Pro Scientific Calculator costs $5.99, with no in-app purchases.

### Is Plus42 free?

Plus42 costs $9.99, with no in-app purchases.

### Which has better reviews, 15C Pro Scientific Calculator or Plus42?

Plus42 is rated higher. 15C Pro Scientific Calculator averages 3.8 out of 5 from 281 ratings, while Plus42 averages 4.9 from 79 ratings.

### Do 15C Pro Scientific Calculator or Plus42 have ads?

Neither 15C Pro Scientific Calculator nor Plus42 shows ads.

### Which is updated more often, 15C Pro Scientific Calculator or Plus42?

15C Pro Scientific Calculator ships an update every 3 months, and Plus42 every 8 days. Most recently, 15C Pro Scientific Calculator was updated on November 6, 2026 and Plus42 on November 7, 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.*