# Sealing Materials Selector vs Trekki

The clearest difference is in-app purchases: Sealing Materials Selector at none against Trekki's 1. Trekki's advantage is update cadence (weekly vs every 11 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Trekki sells 1 in-app purchase, starting at $9.99 per year. Sealing Materials Selector asks for nothing beyond the download.

Sealing Materials Selector ships an update every 11 months, Trekki weekly. The most recent releases landed on October 18, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Sealing Materials Selector | Trekki |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Weekly** |
| Monetization | Free | — |
| Size | 15 MB | 32 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [FLORIAN BAUERNFEIND](https://appshunter.io/developer/1839795452) |

## What reviewers say

### 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


### Trekki

[App page](https://appshunter.io/ios/app/trekki-time-tracker/id6752545299)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trekki Premium - Yearly Plan | $9.99 | per year |


## Frequently asked questions

### Is Sealing Materials Selector free?

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

### Is Trekki free?

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

### Do Sealing Materials Selector or Trekki have ads?

Neither Sealing Materials Selector nor Trekki shows ads.

### Which is updated more often, Sealing Materials Selector or Trekki?

Sealing Materials Selector ships an update every 11 months, and Trekki weekly. Most recently, Sealing Materials Selector was updated on October 18, 2026 and Trekki on October 9, 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.*