# ダクトサイズ計算Pro vs Ductulator

The clearest difference is in-app purchases: ダクトサイズ計算Pro at none against Ductulator's 2. ダクトサイズ計算Pro also leads on update cadence (every 2 days vs every 8 days). Ductulator's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Ductulator sells 2 in-app purchases, starting at $3.99 per 7 days. ダクトサイズ計算Pro asks for nothing beyond the download.

ダクトサイズ計算Pro ships an update every 2 days, Ductulator every 8 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | ダクトサイズ計算Pro | Ductulator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 8 days |
| Size | 34 MB | 29 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [takesi shutou](https://appshunter.io/developer/6778977894) | [Foster Apps LLC](https://appshunter.io/developer/1836663142) |

## What reviewers say

### ダクトサイズ計算Pro

[App page](https://appshunter.io/ios/app/pro/id6782080002)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ductulator

[App page](https://appshunter.io/ios/app/ductulator-hvac-calculator/id6790622859)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $3.99 | per 7 days |
| Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is ダクトサイズ計算Pro free?

ダクトサイズ計算Pro is free to download, with no in-app purchases.

### Is Ductulator free?

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

### Do ダクトサイズ計算Pro or Ductulator have ads?

ダクトサイズ計算Pro shows ads; Ductulator does not.

### Which is updated more often, ダクトサイズ計算Pro or Ductulator?

ダクトサイズ計算Pro ships an update every 2 days, and Ductulator every 8 days. Most recently, ダクトサイズ計算Pro was updated on October 31, 2026 and Ductulator on October 31, 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.*