# P Numbers vs Piping Engineer's Toolbox

The clearest difference is price: P Numbers at Free against Piping Engineer's Toolbox's $4.99. P Numbers also leads on iOS requirement (13.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

P Numbers is free to download; Piping Engineer's Toolbox costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

P Numbers ships an update every 39 months, Piping Engineer's Toolbox every 21 months. The most recent releases landed on June 11, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | P Numbers | Piping Engineer's Toolbox |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/p-numbers/id911716649/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 21 months** |
| Monetization | Free | — |
| Size | 13 MB | 57 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ASMEIX CORPORATION](https://appshunter.io/developer/911716652) | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) |

## 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


### Piping Engineer's Toolbox

[App page](https://appshunter.io/ios/app/piping-engineers-toolbox/id6738736451)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is P Numbers free?

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

### Is Piping Engineer's Toolbox free?

Piping Engineer's Toolbox costs $4.99, with no in-app purchases.

### Do P Numbers or Piping Engineer's Toolbox have ads?

Neither P Numbers nor Piping Engineer's Toolbox shows ads.

### Which is updated more often, P Numbers or Piping Engineer's Toolbox?

P Numbers ships an update every 39 months, and Piping Engineer's Toolbox every 21 months. Most recently, P Numbers was updated on June 11, 2026 and Piping Engineer's Toolbox on September 19, 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.*