# Proof TAB vs SMACNA Duct

Proof TAB and SMACNA Duct are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Proof TAB | SMACNA Duct |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/smacna-duct-u-lator/id6702024229/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | — | Free |
| Size | 948 MB | 3 MB |
| Requires iOS | **15.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jawad Jaber](https://appshunter.io/developer/828202845) | [SHEET METAL CONTRACTORS NATIONAL ASSOCIATION, INC.](https://appshunter.io/developer/427624079) |

## What reviewers say

### Proof TAB

[App page](https://appshunter.io/ios/app/proof-tab/id1640619327)

**Features:** macOS Compatibility

**In-app purchases:** none


### SMACNA Duct

[App page](https://appshunter.io/ios/app/smacna-duct-u-lator/id6702024229)

This tool simplifies HVAC duct sizing for professionals. It quickly calculates dimensions for rectangular, round, and oval ducts based on airflow, friction loss, and velocity, ensuring optimal ventilation system performance.

**Highlights:** Rectangular, round, and oval duct sizing, Real-time calculation updates, Converts duct shapes and sizes, Calculates friction loss, Determines sizes for given velocity, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Proof TAB free?

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

### Is SMACNA Duct free?

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

### Do Proof TAB or SMACNA Duct have ads?

Neither Proof TAB nor SMACNA Duct 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.*