# AirDiffuser vs PipeChecker

The clearest difference is update cadence: PipeChecker at every 4 months against AirDiffuser's every 60 months. AirDiffuser's advantage is price ($2.99 vs $7.99) and iOS requirement (9.0 vs 15.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

AirDiffuser costs $2.99 and PipeChecker $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AirDiffuser ships an update every 60 months, PipeChecker every 4 months. The most recent releases landed on September 28, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | AirDiffuser | PipeChecker |
| --- | --- | --- |
| Price | **$2.99** | $7.99 |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/airdiffuser/id441746795/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 60 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Size | 4 MB | 27 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Technical Data Service Co.,Ltd.](https://appshunter.io/developer/441746798) | [AIR DESIGN, INC.](https://appshunter.io/developer/923430781) |

## 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


### PipeChecker

[App page](https://appshunter.io/ios/app/pipechecker/id1632174229)

This tool assists HVAC, sanitary, and plant piping engineers in selecting optimal pressure piping sizes with simple operations. It streamlines the design process for piping equipment technicians.

**Highlights:** Optimal pressure pipe sizing, Simplified operation, For piping equipment technicians, Supports HVAC, sanitary, and plant systems

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

**In-app purchases:** none


## Frequently asked questions

### Is AirDiffuser free?

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

### Is PipeChecker free?

PipeChecker costs $7.99, with no in-app purchases.

### Do AirDiffuser or PipeChecker have ads?

Neither AirDiffuser nor PipeChecker shows ads.

### Which is updated more often, AirDiffuser or PipeChecker?

AirDiffuser ships an update every 60 months, and PipeChecker every 4 months. Most recently, AirDiffuser was updated on September 28, 2026 and PipeChecker on October 8, 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.*