# AirDiffuser vs 空気線図Pro 湿り空気線図・空調計算

The clearest difference is price: 空気線図Pro 湿り空気線図・空調計算 at Free against AirDiffuser's $2.99. 空気線図Pro 湿り空気線図・空調計算 also leads on update cadence (every 3 days vs every 60 months). AirDiffuser's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

空気線図Pro 湿り空気線図・空調計算 is free to download; AirDiffuser costs $2.99 up front. 空気線図Pro 湿り空気線図・空調計算 sells 1 one-off in-app purchase. AirDiffuser asks for nothing beyond the download.

AirDiffuser ships an update every 60 months, 空気線図Pro 湿り空気線図・空調計算 every 3 days. The most recent releases landed on September 28, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | AirDiffuser | 空気線図Pro 湿り空気線図・空調計算 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/airdiffuser/id441746795/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 60 months | **Every 3 days** |
| Monetization | Paid | — |
| Size | 4 MB | 8 MB |
| Requires iOS | **9.0** | 18.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Technical Data Service Co.,Ltd.](https://appshunter.io/developer/441746798) | [koichi hashimoto](https://appshunter.io/developer/1659408789) |

## What reviewers say

### AirDiffuser

[App page](https://appshunter.io/ios/app/airdiffuser/id441746795)

Quickly select air ceiling diffusers for HVAC systems. Input wind amount to calculate apparatus size and wind velocity. Supports various diffuser types and customizable settings for site and meeting use.

**Highlights:** Easy apparatus size selection by wind amount input, Supports various diffuser types (Round, Square, BL, CL, etc.), Adjustable aperture rate and wind velocity, Reverse calculation of wind amount, Metric system calculations, Calculations for BL and CL round length

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

**In-app purchases:** none


### 空気線図Pro 湿り空気線図・空調計算

[App page](https://appshunter.io/ios/app/pro/id6792616333)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $5.99 | one-time |


## Frequently asked questions

### Is AirDiffuser free?

AirDiffuser costs $2.99, with no in-app purchases.

### Is 空気線図Pro 湿り空気線図・空調計算 free?

空気線図Pro 湿り空気線図・空調計算 is free to download, with in-app purchases available.

### Do AirDiffuser or 空気線図Pro 湿り空気線図・空調計算 have ads?

空気線図Pro 湿り空気線図・空調計算 shows ads; AirDiffuser does not.

### Which is updated more often, AirDiffuser or 空気線図Pro 湿り空気線図・空調計算?

AirDiffuser ships an update every 60 months, and 空気線図Pro 湿り空気線図・空調計算 every 3 days. Most recently, AirDiffuser was updated on September 28, 2026 and 空気線図Pro 湿り空気線図・空調計算 on October 6, 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.*