# Hydraulic Engineer vs 3D Print Commander

The clearest difference is review sentiment: 3D Print Commander at 100% against Hydraulic Engineer's 25%. 3D Print Commander also leads on price (Free vs $4.99) and rating (5.0 vs 4.0). Hydraulic Engineer's advantage is ads (none vs shown) and iOS requirement (18.6 vs 27.0). On ratings volume there is nothing between them.

3D Print Commander is free to download; Hydraulic Engineer costs $4.99 up front. Hydraulic Engineer sells 1 one-off in-app purchase. 3D Print Commander asks for nothing beyond the download.

3D Print Commander holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 25% of Hydraulic Engineer's written reviews are positive against 100% of 3D Print Commander's.

Hydraulic Engineer ships an update every 6 months, 3D Print Commander every 5 weeks. The most recent releases landed on September 26, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Hydraulic Engineer | 3D Print Commander |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/hydraulic-engineer/id410465591/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/3d-print-commander/id6504635784/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Monetization | Paid | **Free** |
| Size | 19 MB | 56 MB |
| Requires iOS | **18.6** | 27.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Volker Schmitt](https://appshunter.io/developer/1466399691) |

## What reviewers say

### Hydraulic Engineer

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

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 |


### 3D Print Commander

[App page](https://appshunter.io/ios/app/3d-print-commander/id6504635784)

This app helps 3D printing enthusiasts manage their filament materials, track usage, and log calibration and drying parameters. It offers Apple Watch and Shortcuts integration for enhanced control and efficiency.

**Highlights:** Effortless filament organization, Precise material usage tracking, Easy calibration parameters logging, Detailed filament drying log, Apple Watch support, Shortcuts integration

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic Engineer free?

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

### Is 3D Print Commander free?

3D Print Commander is free to download, with no in-app purchases.

### Which has better reviews, Hydraulic Engineer or 3D Print Commander?

3D Print Commander is rated higher. Hydraulic Engineer averages 4.0 out of 5 from 1 ratings, while 3D Print Commander averages 5.0 from 1 ratings.

### Do Hydraulic Engineer or 3D Print Commander have ads?

3D Print Commander shows ads; Hydraulic Engineer does not.

### Which is updated more often, Hydraulic Engineer or 3D Print Commander?

Hydraulic Engineer ships an update every 6 months, and 3D Print Commander every 5 weeks. Most recently, Hydraulic Engineer was updated on September 26, 2026 and 3D Print Commander on September 16, 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.*