# Heating Pipe Size vs Structures Inspector

The clearest difference is price: Structures Inspector at Free against Heating Pipe Size's $5.99. Structures Inspector also leads on update cadence (every 5 months vs every 15 months) and iOS requirement (17.0 vs 26.0). Heating Pipe Size's advantage is device support (3 vs 1). On ads and in-app purchases there is nothing between them.

Structures Inspector is free to download; Heating Pipe Size costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Heating Pipe Size ships an update every 15 months, Structures Inspector every 5 months. The most recent releases landed on September 9, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Heating Pipe Size | Structures Inspector |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 5 months** |
| Size | 1 MB | 194 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad, Mac** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sebastjan Valic](https://appshunter.io/developer/503687385) | [Trimble Inc.](https://appshunter.io/developer/322561665) |

## What reviewers say

### Heating Pipe Size

[App page](https://appshunter.io/ios/app/heating-pipe-size/id527730872)

**Features:** Vision Pro support

**In-app purchases:** none


### Structures Inspector

[App page](https://appshunter.io/ios/app/structures-inspector/id1532318954)

**In-app purchases:** none


## Frequently asked questions

### Is Heating Pipe Size free?

Heating Pipe Size costs $5.99, with no in-app purchases.

### Is Structures Inspector free?

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

### Do Heating Pipe Size or Structures Inspector have ads?

Neither Heating Pipe Size nor Structures Inspector shows ads.

### Which is updated more often, Heating Pipe Size or Structures Inspector?

Heating Pipe Size ships an update every 15 months, and Structures Inspector every 5 months. Most recently, Heating Pipe Size was updated on September 9, 2026 and Structures Inspector on September 13, 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.*