# Hydraulic vs Engine Calculator Plus

The clearest difference is price: Hydraulic at Free against Engine Calculator Plus's $2.99. Hydraulic also leads on review sentiment (50% vs 13%) and update cadence (every 6 weeks vs every 48 months). Engine Calculator Plus's advantage is in-app purchases (none vs 2) and chart position (#183 vs unranked). On ads and device support there is nothing between them.

Hydraulic is free to download; Engine Calculator Plus costs $2.99 up front. Hydraulic sells 2 one-off in-app purchases. Engine Calculator Plus asks for nothing beyond the download.

Hydraulic holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Hydraulic has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Hydraulic's written reviews are positive against 13% of Engine Calculator Plus's.

Hydraulic ships an update every 6 weeks, Engine Calculator Plus every 48 months. The most recent releases landed on June 4, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Hydraulic | Engine Calculator Plus |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.2 (16 ratings)](https://appshunter.io/ios/app/hydraulic-calculator/id612615039/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/engine-calculator-plus/id1355990764/reviews) |
| Number of ratings | **16** | 1 |
| Positive reviews | **50.0% of reviews** | 12.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 48 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#183** |
| Size | 24 MB | 2 MB |
| Requires iOS | 15.1 | **13** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Hydraulic

[App page](https://appshunter.io/ios/app/hydraulic-calculator/id612615039)

Perform essential hydraulic calculations for cylinders, pumps, and fluid lines. Solve for forces, speeds, torque, power, and pressure drop. Supports metric and imperial units, with advanced features unlocked via in-app purchase.

**Highlights:** Cylinder force and speed calculations, Pump displacement, flow, and pressure calculations, Hydraulic line fluid velocity and pressure drop, Orifice flow and pressure calculations, Speed, torque, and power calculations, Metric and imperial unit support, Copy results to clipboard

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $7.99 | one-time |
| Pro Version | $7.99 | one-time |


### Engine Calculator Plus

[App page](https://appshunter.io/ios/app/engine-calculator-plus/id1355990764)

**Currently charting:** #183 Top Paid · Productivity (US App Store)

Calculate engine specifications for various car and plane engines, including displacement, compression ratio, and horsepower. Supports metric and imperial systems with a user-friendly interface and 3D engine visualization.

**Highlights:** Engine displacement calculation, Compression ratio calculation, Horsepower estimation, Metric and Imperial support, 3D engine display, Copyable results

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

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic free?

Hydraulic is free to download, with in-app purchases available.

### Is Engine Calculator Plus free?

Engine Calculator Plus costs $2.99, with no in-app purchases.

### Which has better reviews, Hydraulic or Engine Calculator Plus?

Hydraulic is rated higher. Hydraulic averages 4.2 out of 5 from 16 ratings, while Engine Calculator Plus averages 4.0 from 1 ratings.

### Do Hydraulic or Engine Calculator Plus have ads?

Neither Hydraulic nor Engine Calculator Plus shows ads.

### Which is updated more often, Hydraulic or Engine Calculator Plus?

Hydraulic ships an update every 6 weeks, and Engine Calculator Plus every 48 months. Most recently, Hydraulic was updated on June 4, 2026 and Engine Calculator Plus on September 10, 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.*