# Duct Calculator vs MEP Toolbook

The clearest difference is in-app purchases: MEP Toolbook at none against Duct Calculator's 1. Duct Calculator's advantage is iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

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

## The numbers

| Metric | Duct Calculator | MEP Toolbook |
| --- | --- | --- |
| 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 | No |
| Update frequency | Every 10 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 44 MB | 2 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sachinbhai Surani](https://appshunter.io/developer/1838685550) | [Accentuate Solutions Company Limited](https://appshunter.io/developer/6775866322) |

## 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 |


### MEP Toolbook

[App page](https://appshunter.io/ios/app/mep-toolbook/id6780730761)

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

**In-app purchases:** none


## Frequently asked questions

### Is Duct Calculator free?

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

### Is MEP Toolbook free?

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

### Do Duct Calculator or MEP Toolbook have ads?

Neither Duct Calculator nor MEP Toolbook shows ads.

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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.*