# F Numbers vs Piping Engineer's Toolbox

The clearest difference is price: F Numbers at Free against Piping Engineer's Toolbox's $4.99. F 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.

F 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.

F Numbers ships an update every 13 months, Piping Engineer's Toolbox every 21 months. The most recent releases landed on June 1, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | F Numbers | Piping Engineer's Toolbox |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/f-numbers/id929309069/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 13 months** | Every 21 months |
| Monetization | Free | — |
| Size | 15 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

### F Numbers

[App page](https://appshunter.io/ios/app/f-numbers/id929309069)

Quickly find filler metal groupings for welding procedures and performance qualifications. Access classifications with descriptions of intended use, based on ASME and AWS standards.

**Highlights:** Filler metal grouping lookup, Welding procedure qualification, Performance qualification data, Classification descriptions, ASME Section IX data, AWS standards 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 F Numbers free?

F 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 F Numbers or Piping Engineer's Toolbox have ads?

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

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

F Numbers ships an update every 13 months, and Piping Engineer's Toolbox every 21 months. Most recently, F Numbers was updated on June 1, 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.*