# ChekDuct vs Duct Calculator

The clearest difference is in-app purchases: ChekDuct at none against Duct Calculator's 1. ChekDuct also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price and ads there is nothing between them.

Both are free to download. Duct Calculator sells 1 in-app purchase, starting at $9.99 per year. ChekDuct asks for nothing beyond the download.

## The numbers

| Metric | ChekDuct | Duct Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Fortnightly |
| Size | 187 MB | 8 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mohamed Kharbat](https://appshunter.io/developer/1894953065) | [Vladimir Lukashov](https://appshunter.io/developer/6783697231) |

## What reviewers say

### ChekDuct

[App page](https://appshunter.io/ios/app/chekduct/id6768763588)

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

**In-app purchases:** none


### Duct Calculator

[App page](https://appshunter.io/ios/app/duct-calculator-hvac-sizing/id6789039757)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ductulator Pro | $9.99 | per year |


## Frequently asked questions

### Is ChekDuct free?

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

### Is Duct Calculator free?

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

### Do ChekDuct or Duct Calculator have ads?

Neither ChekDuct nor Duct Calculator 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.*