# Installation Instructions vs Hengst Hydraulics

The clearest difference is update cadence: Hengst Hydraulics at every 3 months against Installation Instructions's every 11 months. Installation Instructions's advantage is iOS requirement (10.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Installation Instructions ships an update every 11 months, Hengst Hydraulics every 3 months. The most recent releases landed on October 18, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Installation Instructions | Hengst Hydraulics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/installation-instructions/id720681644/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 12 MB | 31 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Codana GmbH](https://appshunter.io/developer/1133125230) |

## What reviewers say

### Installation Instructions

[App page](https://appshunter.io/ios/app/installation-instructions/id720681644)

This app provides visual guidance for the correct installation of various seals. It uses film, animation, and documentation to simulate expert installation, covering hydraulic, radial, and mechanical face seals, along with visual inspection and common mistakes.

**Highlights:** Hydraulic seal installation (rod/piston), Radial oil seal installation, Mechanical face seal installation, Visual inspection guidance, Common installation mistakes, Use of assembly tools

**Features:** macOS Compatibility

**In-app purchases:** none


### Hengst Hydraulics

[App page](https://appshunter.io/ios/app/hengst-hydraulics/id6449468157)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Installation Instructions free?

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

### Is Hengst Hydraulics free?

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

### Do Installation Instructions or Hengst Hydraulics have ads?

Neither Installation Instructions nor Hengst Hydraulics shows ads.

### Which is updated more often, Installation Instructions or Hengst Hydraulics?

Installation Instructions ships an update every 11 months, and Hengst Hydraulics every 3 months. Most recently, Installation Instructions was updated on October 18, 2026 and Hengst Hydraulics on October 8, 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.*