# Hydraulic Engineer vs Torque Unit CVT

The clearest difference is price: Torque Unit CVT at Free against Hydraulic Engineer's $4.99. Torque Unit CVT also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 6 months). Hydraulic Engineer's advantage is review sentiment (25% vs 0%). On ads and device support there is nothing between them.

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

Hydraulic Engineer ships an update every 6 months, Torque Unit CVT every 2 months. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Hydraulic Engineer | Torque Unit CVT |
| --- | --- | --- |
| 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** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 19 MB | 11 MB |
| Requires iOS | 18.6 | **12.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Hidenori Ishii](https://appshunter.io/developer/1453853542) |

## 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 |


### Torque Unit CVT

[App page](https://appshunter.io/ios/app/torque-unit-cvt/id1454473724)

Easily convert torque units with this straightforward tool. It supports conversions between N-m, N-cm, mNm, kgf-m, kgf-cm, and gf-cm. The conversion happens instantly as you input values.

**Highlights:** Torque unit conversion, Supports N-m, N-cm, mNm, kgf-m, kgf-cm, gf-cm, Instant conversion upon input, Simple and intuitive interface

**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 Torque Unit CVT free?

Torque Unit CVT is free to download, with no in-app purchases.

### Do Hydraulic Engineer or Torque Unit CVT have ads?

Neither Hydraulic Engineer nor Torque Unit CVT shows ads.

### Which is updated more often, Hydraulic Engineer or Torque Unit CVT?

Hydraulic Engineer ships an update every 6 months, and Torque Unit CVT every 2 months. Most recently, Hydraulic Engineer was updated on October 6, 2026 and Torque Unit CVT on October 15, 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.*