# HydroCalc Plus vs SHK Toolbox von LFDEV

The clearest difference is in-app purchases: SHK Toolbox von LFDEV at none against HydroCalc Plus's 4. SHK Toolbox von LFDEV also leads on price ($1.99 vs $3.99). HydroCalc Plus's advantage is update cadence (every 3 weeks vs every 3 months). On ads, device support and iOS requirement there is nothing between them.

HydroCalc Plus costs $3.99 and SHK Toolbox von LFDEV $1.99 up front. HydroCalc Plus sells 4 one-off in-app purchases. SHK Toolbox von LFDEV asks for nothing beyond the download.

HydroCalc Plus ships an update every 3 weeks, SHK Toolbox von LFDEV every 3 months. The most recent releases landed on August 31, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | HydroCalc Plus | SHK Toolbox von LFDEV |
| --- | --- | --- |
| Price | $3.99 | **$1.99** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Paid | — |
| Size | 34 MB | 28 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) | [Lukas Fink](https://appshunter.io/developer/1858830591) |

## What reviewers say

### HydroCalc Plus

[App page](https://appshunter.io/ios/app/hydrocalc-plus/id578807688)

A professional tool for hydraulic engineers to calculate pressure losses in piping systems. It supports US and SI units, offers an extensive pipe material and fittings database, and includes inverse calculations for design optimization.

**Highlights:** Friction head loss calculation (Hazen-Williams), US and SI unit support, Extensive pipe material library, Fittings and valves database, Inverse calculation mode, Real-time results (velocity, losses)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pump Power Calculator | $1.99 | one-time |
| System Curve Generator | $1.99 | one-time |
| Pipe Database | $1.99 | one-time |
| Industrial Fluids Pack | $2.99 | one-time |


### SHK Toolbox von LFDEV

[App page](https://appshunter.io/ios/app/shk-toolbox-von-lfdev/id6756174675)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HydroCalc Plus free?

HydroCalc Plus costs $3.99, and also offers in-app purchases.

### Is SHK Toolbox von LFDEV free?

SHK Toolbox von LFDEV costs $1.99, with no in-app purchases.

### Do HydroCalc Plus or SHK Toolbox von LFDEV have ads?

Neither HydroCalc Plus nor SHK Toolbox von LFDEV shows ads.

### Which is updated more often, HydroCalc Plus or SHK Toolbox von LFDEV?

HydroCalc Plus ships an update every 3 weeks, and SHK Toolbox von LFDEV every 3 months. Most recently, HydroCalc Plus was updated on August 31, 2026 and SHK Toolbox von LFDEV on September 22, 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.*