# Racking vs ダクトサイズ計算Pro

The clearest difference is ads: Racking at none against ダクトサイズ計算Pro's shown. Racking also leads on iOS requirement (12.1 vs 15.1). ダクトサイズ計算Pro's advantage is update cadence (every 2 days vs every 5 months). On price, 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.

Racking ships an update every 5 months, ダクトサイズ計算Pro every 2 days. The most recent releases landed on September 17, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Racking | ダクトサイズ計算Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 days** |
| Size | 10 MB | 34 MB |
| Requires iOS | **12.1** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [nobutaka uchimura](https://appshunter.io/developer/767402481) | [takesi shutou](https://appshunter.io/developer/6778977894) |

## What reviewers say

### Racking

[App page](https://appshunter.io/ios/app/racking/id1465067407)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Racking free?

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

### 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.

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

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

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

Racking ships an update every 5 months, and ダクトサイズ計算Pro every 2 days. Most recently, Racking was updated on September 17, 2026 and ダクトサイズ計算Pro on September 28, 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.*