# explainEN287 vs P Numbers

The clearest difference is iOS requirement: P Numbers at 13.0 against explainEN287's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

explainEN287 ships an update every 20 months, P Numbers every 39 months. The most recent releases landed on August 22, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | explainEN287 | P Numbers |
| --- | --- | --- |
| Price | Free | Free |
| 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 20 months** | Every 39 months |
| Monetization | — | Free |
| Size | 1 MB | 13 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Georg Rose](https://appshunter.io/developer/521567472) | [ASMEIX CORPORATION](https://appshunter.io/developer/911716652) |

## What reviewers say

### explainEN287

[App page](https://appshunter.io/ios/app/explainen287/id656646286)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is explainEN287 free?

explainEN287 is free to download, with no in-app purchases.

### Is P Numbers free?

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

### Do explainEN287 or P Numbers have ads?

Neither explainEN287 nor P Numbers shows ads.

### Which is updated more often, explainEN287 or P Numbers?

explainEN287 ships an update every 20 months, and P Numbers every 39 months. Most recently, explainEN287 was updated on August 22, 2026 and P Numbers on June 11, 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.*