# ダクトサイズ計算Pro vs PlantCalculator

The clearest difference is update cadence: ダクトサイズ計算Pro at every 2 days against PlantCalculator's every 9 days. PlantCalculator's advantage is iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

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

ダクトサイズ計算Pro ships an update every 2 days, PlantCalculator every 9 days. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ダクトサイズ計算Pro | PlantCalculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 9 days |
| Size | 34 MB | 25 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [takesi shutou](https://appshunter.io/developer/6778977894) | [Ryo Iida](https://appshunter.io/developer/1852269856) |

## 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


### PlantCalculator

[App page](https://appshunter.io/ios/app/plantcalculator/id6782103531)

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

**In-app purchases:** none


## 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 PlantCalculator free?

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

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

Both ダクトサイズ計算Pro and PlantCalculator show ads.

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

ダクトサイズ計算Pro ships an update every 2 days, and PlantCalculator every 9 days. Most recently, ダクトサイズ計算Pro was updated on October 13, 2026 and PlantCalculator on October 12, 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.*