# Hydraulic Engineer vs Hydraulic System Calculator

The clearest difference is price: Hydraulic System Calculator at Free against Hydraulic Engineer's $4.99. Hydraulic System Calculator also leads on in-app purchases (none vs 1) and ratings volume (3 vs 1). Hydraulic Engineer's advantage is review sentiment (25% vs 0%) and chart position (#137 vs unranked). On rating, update cadence, ads and device support there is nothing between them.

Hydraulic System Calculator is free to download; Hydraulic Engineer costs $4.99 up front. Hydraulic Engineer sells 1 one-off in-app purchase. Hydraulic System Calculator asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.0 for Hydraulic Engineer against 4.0 for Hydraulic System Calculator. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews are what separate them: 25% of Hydraulic Engineer's written reviews are positive against 0% of Hydraulic System Calculator's.

Hydraulic Engineer ships an update every 6 months, Hydraulic System Calculator every 7 months. The most recent releases landed on October 30, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Hydraulic Engineer | Hydraulic System Calculator |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/hydraulic-engineer/id410465591/reviews) | [4.0 (3 ratings)](https://appshunter.io/ios/app/hydraulic-system-calculator/id826281445/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 7 months |
| Monetization | Paid | **Free** |
| Best chart rank | **#137** | — |
| Size | 19 MB | 94 MB |
| Requires iOS | 18.6 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) |

## What reviewers say

### Hydraulic Engineer

[App page](https://appshunter.io/ios/app/hydraulic-engineer/id410465591)

**Currently charting:** #137 Top Paid · Productivity (US App Store)

This comprehensive calculator app offers over 1,000 hydraulic engineering formulas across 13 categories. It includes temperature conversions, reference tables, and the ability to save and share calculations. Works offline and supports both US Customary and SI Metric units.

**Highlights:** Over 1,000 hydraulic formulas, 13 specialized calculator categories, Temperature scale converters, Professional reference tables, Save and share calculations, Works offline, US Customary and SI Metric units

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hydraulic Pro | $3.99 | one-time |


### Hydraulic System Calculator

[App page](https://appshunter.io/ios/app/hydraulic-system-calculator/id826281445)

Calculate key parameters for hydraulic cylinders, pumps, motors, and pipes. Design individual components, view formulas, and switch between metric and imperial units for precise engineering.

**Highlights:** Calculate cylinder, pump, and motor parameters, Design single/double-acting cylinders, View and switch units (Metric/Imperial), Calculate piping parameters, Dynamic result updates, Copy and share results

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic Engineer free?

Hydraulic Engineer costs $4.99, and also offers in-app purchases.

### Is Hydraulic System Calculator free?

Hydraulic System Calculator is free to download, with no in-app purchases.

### Which has better reviews, Hydraulic Engineer or Hydraulic System Calculator?

Hydraulic Engineer and Hydraulic System Calculator are both rated 4.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Hydraulic Engineer or Hydraulic System Calculator have ads?

Neither Hydraulic Engineer nor Hydraulic System Calculator shows ads.

### Which is updated more often, Hydraulic Engineer or Hydraulic System Calculator?

Hydraulic Engineer ships an update every 6 months, and Hydraulic System Calculator every 7 months. Most recently, Hydraulic Engineer was updated on October 30, 2026 and Hydraulic System Calculator on September 30, 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.*