# P Numbers vs Thread Calculator

The clearest difference is review sentiment: P Numbers at 100% against Thread Calculator's 33%. P Numbers also leads on ads (none vs shown) and rating (4.8 vs 4.4). Thread Calculator's advantage is update cadence (every 18 months vs every 39 months). On price, ratings volume, 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.

P Numbers holds the better App Store score, 4.8 against 4.4. Both are backed by a comparable volume of ratings — 5 and 14 respectively. Written reviews point the same way: 100% of P Numbers's written reviews are positive against 33% of Thread Calculator's.

P Numbers ships an update every 39 months, Thread Calculator every 18 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | P Numbers | Thread Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/p-numbers/id911716649/reviews)** | [4.4 (14 ratings)](https://appshunter.io/ios/app/thread-calculator/id1559560290/reviews) |
| Number of ratings | 5 | **14** |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 39 months | **Every 18 months** |
| Monetization | **Free** | Ad-supported |
| Size | 13 MB | 25 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ASMEIX CORPORATION](https://appshunter.io/developer/911716652) | [GSR Gustav Stursberg GmbH](https://appshunter.io/developer/1559560292) |

## What reviewers say

### P Numbers

[App page](https://appshunter.io/ios/app/p-numbers/id911716649)

Quickly access weldability grouping numbers for welding procedures and performance qualifications. This app provides data from authoritative sources like ASME Section IX and AWS B2.1.

**Highlights:** Base metal weldability grouping lookup, Welding procedure qualification data, Performance qualification data, ASME Section IX Table QW/QB-422 data, AWS B2.1 Table C1 and C2 data, ISO/TR 20173 data

**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 P Numbers free?

P Numbers 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, P Numbers or Thread Calculator?

P Numbers is rated higher. P Numbers averages 4.8 out of 5 from 5 ratings, while Thread Calculator averages 4.4 from 14 ratings.

### Do P Numbers or Thread Calculator have ads?

Thread Calculator shows ads; P Numbers does not.

### Which is updated more often, P Numbers or Thread Calculator?

P Numbers ships an update every 39 months, and Thread Calculator every 18 months. Most recently, P Numbers was updated on November 1, 2026 and Thread Calculator on November 3, 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.*