# MEP Calc vs DuctSizer Pro

MEP Calc and DuctSizer Pro are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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. MEP Calc sells 5 in-app purchases, starting at $6.99 per month and DuctSizer Pro sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

MEP Calc ships an update every 5 days, DuctSizer Pro weekly. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | MEP Calc | DuctSizer Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ductsizer-pro/id6772545249/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | — | Free |
| Size | 30 MB | 5 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ahmet Selvi](https://appshunter.io/developer/1864624578) | [LEONARDO NOVOA](https://appshunter.io/developer/6772526007) |

## What reviewers say

### MEP Calc

[App page](https://appshunter.io/ios/app/mep-calc-hvac-fire-calculator/id6759204237)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly - Intro Support | $6.99 | per month |
| MEP Calc Pro (Monthly) | $12.99 | per month |
| Pro Yearly - Intro Support | $24.99 | per year |
| MEP Calc Pro (Yearly) | $29.99 | per year |
| MEP Calc Pro Lifetime | $69.99 | one-time |


### DuctSizer Pro

[App page](https://appshunter.io/ios/app/ductsizer-pro/id6772545249)

This tool quickly calculates HVAC duct sizes based on airflow and friction loss. It supports various duct shapes and provides key airflow values for field use.

**Highlights:** Calculate CFM from duct size, Find duct sizes from CFM, Supports square, round, and oval duct, Shows velocity, friction, area, and equivalent round size, Highlights suggested duct sizes, Compares alternate duct sizes

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Catalog Pro | $2.99 | one-time |


## Frequently asked questions

### Is MEP Calc free?

MEP Calc is free to download, with in-app purchases available.

### Is DuctSizer Pro free?

DuctSizer Pro is free to download, with in-app purchases available.

### Do MEP Calc or DuctSizer Pro have ads?

Neither MEP Calc nor DuctSizer Pro shows ads.

### Which is updated more often, MEP Calc or DuctSizer Pro?

MEP Calc ships an update every 5 days, and DuctSizer Pro weekly. Most recently, MEP Calc was updated on October 28, 2026 and DuctSizer Pro on October 24, 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.*