# Duct Calculator vs TagGuard

The clearest difference is price: TagGuard at Free against Duct Calculator's $19.99. TagGuard also leads on iOS requirement (13.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

TagGuard is free to download; Duct Calculator costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Duct Calculator | TagGuard |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | **[4.5 (189 ratings)](https://appshunter.io/ios/app/duct-calculator/id1078238132/reviews)** | — |
| Number of ratings | **189** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | — |
| Size | 2 MB | 50 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pheinex, LLC](https://appshunter.io/developer/996932317) | [Heung Gi Kim](https://appshunter.io/developer/6784780994) |

## What reviewers say

### Duct Calculator

[App page](https://appshunter.io/ios/app/duct-calculator/id1078238132)

This app allows HVAC professionals to quickly and accurately size new ducts or calculate the performance of existing ones. It supports both round and rectangular ductwork, offering precise calculations through direct entry or intuitive sliders. The tool provides live updates and outputs key performance metrics.

**Highlights:** Size round and rectangular ductwork, Adjust airflow, diameter, width, and height, Direct number entry for precision, Lockable dimensions for 'what-if' scenarios, Live update of calculated values, Outputs velocity and pressure drop, Supports IP and SI units

**Features:** Vision Pro support

**In-app purchases:** none


### TagGuard

[App page](https://appshunter.io/ios/app/tagguard/id6784780992)

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

**In-app purchases:** none


## Frequently asked questions

### Is Duct Calculator free?

Duct Calculator costs $19.99, with no in-app purchases.

### Is TagGuard free?

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

### Do Duct Calculator or TagGuard have ads?

Neither Duct Calculator nor TagGuard shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*