# Duct Calculator vs FluidsMaster

The clearest difference is in-app purchases: FluidsMaster at none against Duct Calculator's 1. Duct Calculator's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Duct Calculator sells 1 one-off in-app purchase. FluidsMaster asks for nothing beyond the download.

## The numbers

| Metric | Duct Calculator | FluidsMaster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/duct-calculator-hvac-sizing/id6756908372/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 44 MB | 42 MB |
| Requires iOS | 15.6 | **14.0.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sachinbhai Surani](https://appshunter.io/developer/1838685550) | [CAGDAS GUNES](https://appshunter.io/developer/6782670660) |

## What reviewers say

### Duct Calculator

[App page](https://appshunter.io/ios/app/duct-calculator-hvac-sizing/id6756908372)

This professional HVAC utility assists engineers and technicians with precise duct sizing and airflow calculations for ventilation systems. It simplifies essential calculations for both design and installation work, improving on-site efficiency.

**Highlights:** Calculate duct sizes using airflow (CFM) and velocity (FPM), Supports rectangular and round duct sizing in inches, Determine air flow rate in CFM, Calculate air velocity in FPM, Simple interface for fast on-site calculations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


### FluidsMaster

[App page](https://appshunter.io/ios/app/fluidsmaster/id6782670658)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Duct Calculator free?

Duct Calculator is free to download, with in-app purchases available.

### Is FluidsMaster free?

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

### Do Duct Calculator or FluidsMaster have ads?

FluidsMaster shows ads; Duct Calculator does not.

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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.*