# Seals Catalog vs Thread Calculator

The clearest difference is rating: Seals Catalog at 5.0 against Thread Calculator's 4.3. Seals Catalog also leads on ads (none vs shown) and monetization model (free vs ad-supported). Thread Calculator's advantage is ratings volume (13 vs 1). 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.

Seals Catalog 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 1, so its average is the more settled of the two.

Seals Catalog ships an update every 10 months, Thread Calculator every 18 months. The most recent releases landed on June 22, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Seals Catalog | Thread Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/seals-catalog/id1460114822/reviews)** | [4.3 (13 ratings)](https://appshunter.io/ios/app/thread-calculator/id1559560290/reviews) |
| Number of ratings | 1 | **13** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 10 months** | Every 18 months |
| Monetization | **Free** | Ad-supported |
| Size | 34 MB | 25 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, 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

### Seals Catalog

[App page](https://appshunter.io/ios/app/seals-catalog/id1460114822)

Access detailed product information, material data sheets, and compare multiple seals. Filter products by item number, type, or operating conditions to find specific items. Request quotations directly through the app by adding items to a shopping cart.

**Highlights:** Detailed product descriptions, Material data sheets, Seal comparison tool, Product search and filtering, Request quotation, Shopping cart functionality

**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 Seals Catalog free?

Seals Catalog 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, Seals Catalog or Thread Calculator?

Seals Catalog is rated higher. Seals Catalog averages 5.0 out of 5 from 1 ratings, while Thread Calculator averages 4.3 from 13 ratings.

### Do Seals Catalog or Thread Calculator have ads?

Thread Calculator shows ads; Seals Catalog does not.

### Which is updated more often, Seals Catalog or Thread Calculator?

Seals Catalog ships an update every 10 months, and Thread Calculator every 18 months. Most recently, Seals Catalog was updated on June 22, 2026 and Thread Calculator on September 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.*