# 勾配電卓 vs ダクト圧損計算Pro

The clearest difference is iOS requirement: ダクト圧損計算Pro at 15.1 against 勾配電卓's 17.0. 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.

## The numbers

| Metric | 勾配電卓 | ダクト圧損計算Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | Yes |
| Update frequency | Every 45 months | — |
| Size | 1 MB | 35 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takahiro Miyashita](https://appshunter.io/developer/1493701742) | [takesi shutou](https://appshunter.io/developer/6778977894) |

## What reviewers say

### 勾配電卓

[App page](https://appshunter.io/ios/app/1x/id1493701743)

**Features:** macOS Compatibility

**In-app purchases:** none


### ダクト圧損計算Pro

[App page](https://appshunter.io/ios/app/pro/id6797879580)

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

**In-app purchases:** none


## Frequently asked questions

### Is 勾配電卓 free?

勾配電卓 is free to download, with no in-app purchases.

### Is ダクト圧損計算Pro free?

ダクト圧損計算Pro is free to download, with no in-app purchases.

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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.*