# Hydraulic vs TESS Services

The clearest difference is in-app purchases: TESS Services at none against Hydraulic's 2. TESS Services also leads on iOS requirement (11.0 vs 15.1). Hydraulic's advantage is update cadence (every 6 weeks vs every 13 months). On price, ads and device support there is nothing between them.

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

Hydraulic ships an update every 6 weeks, TESS Services every 13 months. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Hydraulic | TESS Services |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (17 ratings)](https://appshunter.io/ios/app/hydraulic-calculator/id612615039/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 13 months |
| Monetization | Free with in-app purchases | — |
| Size | 24 MB | 163 MB |
| Requires iOS | 15.1 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [TESS as](https://appshunter.io/developer/916176940) |

## 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 |


### TESS Services

[App page](https://appshunter.io/ios/app/tess-services/id1551100621)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic free?

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

### Is TESS Services free?

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

### Do Hydraulic or TESS Services have ads?

Neither Hydraulic nor TESS Services shows ads.

### Which is updated more often, Hydraulic or TESS Services?

Hydraulic ships an update every 6 weeks, and TESS Services every 13 months. Most recently, Hydraulic was updated on October 20, 2026 and TESS Services on October 7, 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.*