# Dreher App vs Thread Calculator

The clearest difference is ads: Dreher App at none against Thread Calculator's shown. Dreher App also leads on update cadence (every 4 months vs every 18 months) and iOS requirement (13.1 vs 15.0). On price, 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.

Dreher App ships an update every 4 months, Thread Calculator every 18 months. The most recent releases landed on May 16, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Dreher App | Thread Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (13 ratings)](https://appshunter.io/ios/app/thread-calculator/id1559560290/reviews)** |
| Number of ratings | — | **13** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 18 months |
| Monetization | — | Ad-supported |
| Size | 8 MB | 25 MB |
| Requires iOS | **13.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Markus Meckel](https://appshunter.io/developer/852996793) | [GSR Gustav Stursberg GmbH](https://appshunter.io/developer/1559560292) |

## What reviewers say

### Dreher App

[App page](https://appshunter.io/ios/app/dreher-app/id852996790)

**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 Dreher App free?

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

### Is Thread Calculator free?

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

### Do Dreher App or Thread Calculator have ads?

Thread Calculator shows ads; Dreher App does not.

### Which is updated more often, Dreher App or Thread Calculator?

Dreher App ships an update every 4 months, and Thread Calculator every 18 months. Most recently, Dreher App was updated on May 16, 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.*