# Hydraulic vs Thread Calculator

The clearest difference is in-app purchases: Thread Calculator at none against Hydraulic's 2. Thread Calculator also leads on rating (4.4 vs 4.1). Hydraulic's advantage is ads (none vs shown) and update cadence (every 6 weeks vs every 18 months). On price, ratings volume, device support and iOS requirement there is nothing between them.

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

Thread Calculator holds the better App Store score, 4.4 against 4.1. Both are backed by a comparable volume of ratings — 17 and 14 respectively. Written reviews complicate that: 50% of Hydraulic's written reviews are positive against 33% of Thread Calculator's, so the app with the better star average is not the one people write more warmly about.

Hydraulic ships an update every 6 weeks, Thread Calculator every 18 months. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Hydraulic | Thread Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (17 ratings)](https://appshunter.io/ios/app/hydraulic-calculator/id612615039/reviews) | **[4.4 (14 ratings)](https://appshunter.io/ios/app/thread-calculator/id1559560290/reviews)** |
| Number of ratings | **17** | 14 |
| Positive reviews | **50.0% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 18 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 24 MB | 25 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [GSR Gustav Stursberg GmbH](https://appshunter.io/developer/1559560292) |

## 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 |


### Thread Calculator

[App page](https://appshunter.io/ios/app/thread-calculator/id1559560290)

This app provides a quick and easy way to calculate thread dimensions for various units, including tap hole sizes and bolt specifications. It helps metalworkers find precise measurements for internal and external threads without consulting tables.

**Highlights:** Thread cutting calculator for multiple units, Cold forming calculator, Thread repair calculator, Tap hole and bolt diameter calculation, Saves time compared to tables

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic free?

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

### Is Thread Calculator free?

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

### Which has better reviews, Hydraulic or Thread Calculator?

Thread Calculator is rated higher. Hydraulic averages 4.1 out of 5 from 17 ratings, while Thread Calculator averages 4.4 from 14 ratings.

### Do Hydraulic or Thread Calculator have ads?

Thread Calculator shows ads; Hydraulic does not.

### Which is updated more often, Hydraulic or Thread Calculator?

Hydraulic ships an update every 6 weeks, and Thread Calculator every 18 months. Most recently, Hydraulic was updated on October 20, 2026 and Thread Calculator on October 24, 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.*