# Hydraulic Engineer vs NORO

The clearest difference is review sentiment: NORO at 100% against Hydraulic Engineer's 25%. NORO also leads on price (Free vs $4.99) and in-app purchases (none vs 1). Hydraulic Engineer's advantage is update cadence (every 6 months vs every 66 months). On ads and device support there is nothing between them.

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

Hydraulic Engineer ships an update every 6 months, NORO every 66 months. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Hydraulic Engineer | NORO |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/hydraulic-engineer/id410465591/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 66 months |
| Monetization | Paid | **Free** |
| Size | 19 MB | 52 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [NORO GmbH](https://appshunter.io/developer/901278858) |

## 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 |


### NORO

[App page](https://appshunter.io/ios/app/noro/id901278855)

Access 3D CAD data for a standard product range of pipes, mouldings, and distribution systems. Engineers and project managers can view models for steel and chromium-nickel steel components directly on mobile devices.

**Highlights:** 3D CAD data access, Standard product range, Pipes, mouldings, distribution systems, Steel and chromium-nickel steel, Compatible with major CAD systems, Mobile device access

**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 NORO free?

NORO is free to download, with no in-app purchases.

### Do Hydraulic Engineer or NORO have ads?

Neither Hydraulic Engineer nor NORO shows ads.

### Which is updated more often, Hydraulic Engineer or NORO?

Hydraulic Engineer ships an update every 6 months, and NORO every 66 months. Most recently, Hydraulic Engineer was updated on October 6, 2026 and NORO on October 3, 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.*