# Sealing Materials Selector vs O

Sealing Materials Selector and O are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Sealing Materials Selector ships an update every 11 months, O every 13 months. The most recent releases landed on June 4, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Sealing Materials Selector | O |
| --- | --- | --- |
| 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 11 months** | Every 13 months |
| Monetization | Free | — |
| Size | 15 MB | 5 MB |
| Requires iOS | **15.6** | 16.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [AppBakkers BV](https://appshunter.io/developer/1104913401) |

## 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


### O

[App page](https://appshunter.io/ios/app/o-ringeu/id6450456605)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sealing Materials Selector free?

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

### Is O free?

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

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

Neither Sealing Materials Selector nor O shows ads.

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

Sealing Materials Selector ships an update every 11 months, and O every 13 months. Most recently, Sealing Materials Selector was updated on June 4, 2026 and O on September 13, 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.*