# Elbow Calculator vs ダクトサイズ計算Pro

The clearest difference is in-app purchases: ダクトサイズ計算Pro at none against Elbow Calculator's 1. ダクトサイズ計算Pro also leads on update cadence (every 2 days vs every 5 months). Elbow Calculator's advantage is ads (none vs shown) and iOS requirement (13.0 vs 15.1). On price and device support there is nothing between them.

Both are free to download. Elbow Calculator sells 1 one-off in-app purchase. ダクトサイズ計算Pro asks for nothing beyond the download.

Elbow Calculator ships an update every 5 months, ダクトサイズ計算Pro every 2 days. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Elbow Calculator | ダクトサイズ計算Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 days** |
| Size | 57 MB | 34 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shital Gorasiya](https://appshunter.io/developer/1737199158) | [takesi shutou](https://appshunter.io/developer/6778977894) |

## What reviewers say

### Elbow Calculator

[App page](https://appshunter.io/ios/app/elbow-calculator/id6753001992)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $5.99 | one-time |


### 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 Elbow Calculator free?

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

### 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 Elbow Calculator or ダクトサイズ計算Pro have ads?

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

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

Elbow Calculator ships an update every 5 months, and ダクトサイズ計算Pro every 2 days. Most recently, Elbow Calculator was updated on October 12, 2026 and ダクトサイズ計算Pro on October 13, 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.*