# Hydraulic Power Unit vs Sealing Materials Selector

The clearest difference is update cadence: Sealing Materials Selector at every 11 months against Hydraulic Power Unit's every 37 months. Hydraulic Power Unit's advantage is iOS requirement (6.0 vs 15.6). 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.

Hydraulic Power Unit ships an update every 37 months, Sealing Materials Selector every 11 months. The most recent releases landed on October 26, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Hydraulic Power Unit | Sealing Materials Selector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sealing-materials-selector/id1128647369/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 37 months | **Every 11 months** |
| Monetization | — | Free |
| Size | 4 MB | 15 MB |
| Requires iOS | **6.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) |

## What reviewers say

### Hydraulic Power Unit

[App page](https://appshunter.io/ios/app/hydraulic-power-unit/id608111471)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sealing Materials Selector

[App page](https://appshunter.io/ios/app/sealing-materials-selector/id1128647369)

Easily find the right sealing materials by entering specifications like temperature and hardness. Filter by chemical compatibility, approvals, or product type for O-Rings, Quad-Rings, and V-Rings. Request material datasheets directly through the app.

**Highlights:** Search by material specifications, Filter by temperature and hardness, Chemical compatibility filtering, Institute approvals filtering, Product type filtering (O-Rings, Quad-Rings, V-Rings), Request material datasheets

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydraulic Power Unit free?

Hydraulic Power Unit is free to download, with no in-app purchases.

### Is Sealing Materials Selector free?

Sealing Materials Selector is free to download, with no in-app purchases.

### Do Hydraulic Power Unit or Sealing Materials Selector have ads?

Neither Hydraulic Power Unit nor Sealing Materials Selector shows ads.

### Which is updated more often, Hydraulic Power Unit or Sealing Materials Selector?

Hydraulic Power Unit ships an update every 37 months, and Sealing Materials Selector every 11 months. Most recently, Hydraulic Power Unit was updated on October 26, 2026 and Sealing Materials Selector on October 18, 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.*