# Sealing Materials Selector vs Thread Calculator

The clearest difference is rating: Sealing Materials Selector at 5.0 against Thread Calculator's 4.3. Sealing Materials Selector also leads on ads (none vs shown) and monetization model (free vs ad-supported). Thread Calculator's advantage is ratings volume (13 vs 2). On price, update cadence, 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.

Sealing Materials Selector holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Thread Calculator has 13 ratings behind it against 2, so its average is the more settled of the two.

Sealing Materials Selector ships an update every 11 months, Thread Calculator every 18 months. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Sealing Materials Selector | Thread Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sealing-materials-selector/id1128647369/reviews)** | [4.3 (13 ratings)](https://appshunter.io/ios/app/thread-calculator/id1559560290/reviews) |
| Number of ratings | 2 | **13** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 11 months** | Every 18 months |
| Monetization | **Free** | Ad-supported |
| Size | 15 MB | 25 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [GSR Gustav Stursberg GmbH](https://appshunter.io/developer/1559560292) |

## 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


### Thread Calculator

[App page](https://appshunter.io/ios/app/thread-calculator/id1559560290)

This app provides a quick and easy way to calculate thread dimensions for various units, including tap hole sizes and bolt specifications. It helps metalworkers find precise measurements for internal and external threads without consulting tables.

**Highlights:** Thread cutting calculator for multiple units, Cold forming calculator, Thread repair calculator, Tap hole and bolt diameter calculation, Saves time compared to tables

**Features:** macOS Compatibility

**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 Thread Calculator free?

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

### Which has better reviews, Sealing Materials Selector or Thread Calculator?

Sealing Materials Selector is rated higher. Sealing Materials Selector averages 5.0 out of 5 from 2 ratings, while Thread Calculator averages 4.3 from 13 ratings.

### Do Sealing Materials Selector or Thread Calculator have ads?

Thread Calculator shows ads; Sealing Materials Selector does not.

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

Sealing Materials Selector ships an update every 11 months, and Thread Calculator every 18 months. Most recently, Sealing Materials Selector was updated on October 12, 2026 and Thread Calculator on October 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.*