# Hydraulic vs UnitsConv

The clearest difference is in-app purchases: UnitsConv at none against Hydraulic's 2. UnitsConv also leads on rating (4.3 vs 4.1) and iOS requirement (12.0 vs 15.1). Hydraulic's advantage is update cadence (every 6 weeks vs every 4 months) and ratings volume (17 vs 3). On price, ads and device support there is nothing between them.

Both are free to download. Hydraulic sells 2 one-off in-app purchases. UnitsConv asks for nothing beyond the download.

UnitsConv holds the better App Store score, 4.3 against 4.1. That said, the two scores are not equally well evidenced: Hydraulic has 17 ratings behind it against 3, so its average is the more settled of the two.

Hydraulic ships an update every 6 weeks, UnitsConv every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Hydraulic | UnitsConv |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (17 ratings)](https://appshunter.io/ios/app/hydraulic-calculator/id612615039/reviews) | **[4.3 (3 ratings)](https://appshunter.io/ios/app/unitsconv/id1291109803/reviews)** |
| Number of ratings | **17** | 3 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 24 MB | 8 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [john selverian](https://appshunter.io/developer/1291109802) |

## 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 |


### UnitsConv

[App page](https://appshunter.io/ios/app/unitsconv/id1291109803)

This app provides conversion factors for 28 common properties used in multiphysics simulations and finite element analysis. It's a free tool designed for engineers and researchers working with complex physical models.

**Highlights:** 28 conversion properties, Multiphysics simulation support, Finite element analysis (FEA) focus, Free to use, Supports iPhone, iPad, and iPod

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic free?

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

### Is UnitsConv free?

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

### Which has better reviews, Hydraulic or UnitsConv?

UnitsConv is rated higher. Hydraulic averages 4.1 out of 5 from 17 ratings, while UnitsConv averages 4.3 from 3 ratings.

### Do Hydraulic or UnitsConv have ads?

Neither Hydraulic nor UnitsConv shows ads.

### Which is updated more often, Hydraulic or UnitsConv?

Hydraulic ships an update every 6 weeks, and UnitsConv every 4 months. Most recently, Hydraulic was updated on November 1, 2026 and UnitsConv on November 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.*