# 超シンプル電圧降下計算 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 超シンプル電圧降下計算's 1. ダクトサイズ計算Pro also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.0). 超シンプル電圧降下計算's advantage is update cadence (daily vs every 2 days). On price and ads there is nothing between them.

Both are free to download. 超シンプル電圧降下計算 sells 1 one-off in-app purchase. ダクトサイズ計算Pro asks for nothing beyond the download.

超シンプル電圧降下計算 ships an update daily, ダクトサイズ計算Pro every 2 days. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 超シンプル電圧降下計算 | ダクトサイズ計算Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Daily** | Every 2 days |
| Size | 6 MB | 34 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SUMMERBANANA](https://appshunter.io/developer/1722829517) | [takesi shutou](https://appshunter.io/developer/6778977894) |

## What reviewers say

### 超シンプル電圧降下計算

[App page](https://appshunter.io/ios/app/id6760455127)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告削除 | $1.99 | 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 超シンプル電圧降下計算 free?

超シンプル電圧降下計算 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 超シンプル電圧降下計算 or ダクトサイズ計算Pro have ads?

Both 超シンプル電圧降下計算 and ダクトサイズ計算Pro show ads.

### Which is updated more often, 超シンプル電圧降下計算 or ダクトサイズ計算Pro?

超シンプル電圧降下計算 ships an update daily, and ダクトサイズ計算Pro every 2 days. Most recently, 超シンプル電圧降下計算 was updated on October 5, 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.*