# DIW Safety App vs Pipe Sizer

The clearest difference is price: DIW Safety App at Free against Pipe Sizer's $2.99. DIW Safety App also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.4). Pipe Sizer's advantage is update cadence (every 5 days vs every 2 months). On ads and in-app purchases there is nothing between them.

DIW Safety App is free to download; Pipe Sizer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DIW Safety App ships an update every 2 months, Pipe Sizer every 5 days. The most recent releases landed on November 7, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | DIW Safety App | Pipe Sizer |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Size | 26 MB | 29 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Department of Industrial Works](https://appshunter.io/developer/1559280980) | [ezyHVAC Co., Ltd.](https://appshunter.io/developer/6825391229) |

## What reviewers say

### DIW Safety App

[App page](https://appshunter.io/ios/app/diw-safety-app/id6443455294)

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

**In-app purchases:** none


### Pipe Sizer

[App page](https://appshunter.io/ios/app/pipe-sizer-pipe-sizing-chart/id6825391227)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DIW Safety App free?

DIW Safety App is free to download, with no in-app purchases.

### Is Pipe Sizer free?

Pipe Sizer costs $2.99, with no in-app purchases.

### Do DIW Safety App or Pipe Sizer have ads?

Neither DIW Safety App nor Pipe Sizer shows ads.

### Which is updated more often, DIW Safety App or Pipe Sizer?

DIW Safety App ships an update every 2 months, and Pipe Sizer every 5 days. Most recently, DIW Safety App was updated on November 7, 2026 and Pipe Sizer on November 1, 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.*