# Plus42 vs HydroCalc

The clearest difference is price: HydroCalc at $2.99 against Plus42's $9.99. Plus42's advantage is ratings volume (79 vs 3) and chart position (#69 vs unranked). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Plus42 costs $9.99 and HydroCalc $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Plus42 against 5.0 for HydroCalc. That said, the two scores are not equally well evidenced: Plus42 has 79 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 92% of Plus42's written reviews are positive against 100% of HydroCalc's.

## The numbers

| Metric | Plus42 | HydroCalc |
| --- | --- | --- |
| Price | $9.99 | **$2.99** |
| Rating | [4.9 (79 ratings)](https://appshunter.io/ios/app/plus42/id1597963622/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hydrocalc-manning-calculator/id6761231476/reviews)** |
| Number of ratings | **79** | 3 |
| Positive reviews | 92.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | **Free** | Paid |
| Best chart rank | **#69** | — |
| Size | 11 MB | 59 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Okken](https://appshunter.io/developer/337692632) | [PATRICK D MC CLELLAN](https://appshunter.io/developer/1872120544) |

## What reviewers say

### Plus42

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

**Currently charting:** #69 Top Paid · Utilities (US App Store)

This advanced scientific calculator simulates the classic HP-42S RPN calculator with enhanced features. It offers algebraic expressions, unit conversions, directories for storage, a larger resizable display, financial functions, and 2D plotting with integral and root finding.

**Highlights:** HP-42S RPN calculator simulation, Algebraic expressions, Attached units and conversions, Program and variable directories, 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


### HydroCalc

[App page](https://appshunter.io/ios/app/hydrocalc-manning-calculator/id6761231476)

This tool calculates open channel and pipe flow using the Manning equation. It's designed for engineers, designers, and students to quickly evaluate hydraulic conditions without manual calculations or spreadsheets. The app works offline and supports various input options for flexible use.

**Highlights:** Calculate flow, velocity, depth, slope, and hydraulic radius, Supports open channel and circular pipe conditions, Flexible input options, Intuitive interface, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Plus42 free?

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

### Is HydroCalc free?

HydroCalc costs $2.99, with no in-app purchases.

### Which has better reviews, Plus42 or HydroCalc?

HydroCalc is rated higher. Plus42 averages 4.9 out of 5 from 79 ratings, while HydroCalc averages 5.0 from 3 ratings.

### Do Plus42 or HydroCalc have ads?

Neither Plus42 nor HydroCalc shows ads.

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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.*