# ThreadFon Multi vs Piping Engineer's Toolbox

The clearest difference is price: ThreadFon Multi at Free against Piping Engineer's Toolbox's $4.99. ThreadFon Multi also leads on update cadence (monthly vs every 21 months) and iOS requirement (12.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

ThreadFon Multi 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.

ThreadFon Multi ships an update monthly, Piping Engineer's Toolbox every 21 months. The most recent releases landed on September 9, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | ThreadFon Multi | Piping Engineer's Toolbox |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/threadfon-multi-thread-calc/id1602169811/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 21 months |
| Monetization | Free | — |
| Size | 43 MB | 57 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dmitriy Trofimov](https://appshunter.io/developer/1598378710) | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) |

## What reviewers say

### ThreadFon Multi

[App page](https://appshunter.io/ios/app/threadfon-multi-thread-calc/id1602169811)

This tool provides detailed insights into metric, inch, pipe, and trapezoidal cylindrical threads based on ISO and ASME standards. It helps users efficiently determine essential thread specifications for various thread types.

**Highlights:** ISO Metric thread support, Unified Inch thread support, Pipe thread support, Trapezoidal thread support, Based on ISO 965 and ASME B1.1 standards, Determines fundamental thread parameters

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

**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 ThreadFon Multi free?

ThreadFon Multi 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 ThreadFon Multi or Piping Engineer's Toolbox have ads?

Neither ThreadFon Multi nor Piping Engineer's Toolbox shows ads.

### Which is updated more often, ThreadFon Multi or Piping Engineer's Toolbox?

ThreadFon Multi ships an update monthly, and Piping Engineer's Toolbox every 21 months. Most recently, ThreadFon Multi was updated on September 9, 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.*