# P Numbers vs SSAB WeldCalc

The clearest difference is review sentiment: P Numbers at 100% against SSAB WeldCalc's 0%. P Numbers also leads on rating (4.8 vs 4.2) and ads (none vs shown). SSAB WeldCalc's advantage is update cadence (every 9 months vs every 39 months) and iOS requirement (10.0 vs 13.0). 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 4.2. Both are backed by a comparable volume of ratings — 5 and 5 respectively. Written reviews point the same way: 100% of P Numbers's written reviews are positive against 0% of SSAB WeldCalc's.

P Numbers ships an update every 39 months, SSAB WeldCalc every 9 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | P Numbers | SSAB WeldCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/p-numbers/id911716649/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/ssab-weldcalc/id1439782052/reviews) |
| Number of ratings | 5 | 5 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 39 months | **Every 9 months** |
| Monetization | **Free** | Ad-supported |
| Size | 13 MB | 127 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ASMEIX CORPORATION](https://appshunter.io/developer/911716652) | [SSAB AB](https://appshunter.io/developer/508406943) |

## 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


### SSAB WeldCalc

[App page](https://appshunter.io/ios/app/ssab-weldcalc/id1439782052)

This tool quickly calculates welding parameters like preheat temperatures, heat input, and machine settings. It also provides a risk analysis and allows users to save and share results as PDFs.

**Highlights:** Welding parameter calculation, Preheat and interpass temperature recommendations, Heat input calculation, Welding machine setting recommendations, Risk analysis, Save and share results as PDF

**In-app purchases:** none


## Frequently asked questions

### Is P Numbers free?

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

### Is SSAB WeldCalc free?

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

### Which has better reviews, P Numbers or SSAB WeldCalc?

P Numbers is rated higher. P Numbers averages 4.8 out of 5 from 5 ratings, while SSAB WeldCalc averages 4.2 from 5 ratings.

### Do P Numbers or SSAB WeldCalc have ads?

SSAB WeldCalc shows ads; P Numbers does not.

### Which is updated more often, P Numbers or SSAB WeldCalc?

P Numbers ships an update every 39 months, and SSAB WeldCalc every 9 months. Most recently, P Numbers was updated on November 1, 2026 and SSAB WeldCalc on November 2, 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.*