# Gas Pipe Sizing Calculator vs Air Flow Conversion Calculator

The clearest difference is rating: Gas Pipe Sizing Calculator at 4.0 against Air Flow Conversion Calculator's 3.5. Gas Pipe Sizing Calculator also leads on update cadence (every 13 months vs every 47 months) and review sentiment (13% vs 0%). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Gas Pipe Sizing Calculator costs $1.99 and Air Flow Conversion Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Gas Pipe Sizing Calculator holds the better App Store score, 4.0 against 3.5. Both are backed by a comparable volume of ratings — 4 and 11 respectively. Written reviews point the same way: 13% of Gas Pipe Sizing Calculator's written reviews are positive against 0% of Air Flow Conversion Calculator's.

Gas Pipe Sizing Calculator ships an update every 13 months, Air Flow Conversion Calculator every 47 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Gas Pipe Sizing Calculator | Air Flow Conversion Calculator |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id596009129/reviews)** | [3.5 (11 ratings)](https://appshunter.io/ios/app/air-flow-conversion-calculator/id1375810553/reviews) |
| Number of ratings | 4 | **11** |
| Positive reviews | **13.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 13 months** | Every 47 months |
| Monetization | Paid | Paid |
| Size | 0 MB | 8 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Connor Kelley](https://appshunter.io/developer/596009132) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Gas Pipe Sizing Calculator

[App page](https://appshunter.io/ios/app/gas-pipe-sizing-calculator/id596009129)

This utility app simplifies gas pipe sizing by performing calculations based on BTU load, run length, and gas type. It eliminates the need for manual chart and codebook referencing, providing the minimum required pipe size quickly.

**Highlights:** Calculates minimum gas pipe size, Input BTU load, Input longest run length, Select gas type (LP or Natural), Designed for low pressure (0.5psi)

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

**In-app purchases:** none


### Air Flow Conversion Calculator

[App page](https://appshunter.io/ios/app/air-flow-conversion-calculator/id1375810553)

Easily calculate air velocity and airflow volume for various duct types. Input dimensions and units, and get instant results for HVAC and ventilation applications.

**Highlights:** Calculate air velocity and airflow volume, Support for circular and rectangular ducts, Multiple unit options for velocity, volume, and dimensions, Instant result display, Useful for HVAC and ventilation

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

**In-app purchases:** none


## Frequently asked questions

### Is Gas Pipe Sizing Calculator free?

Gas Pipe Sizing Calculator costs $1.99, with no in-app purchases.

### Is Air Flow Conversion Calculator free?

Air Flow Conversion Calculator costs $2.99, with no in-app purchases.

### Which has better reviews, Gas Pipe Sizing Calculator or Air Flow Conversion Calculator?

Gas Pipe Sizing Calculator is rated higher. Gas Pipe Sizing Calculator averages 4.0 out of 5 from 4 ratings, while Air Flow Conversion Calculator averages 3.5 from 11 ratings.

### Do Gas Pipe Sizing Calculator or Air Flow Conversion Calculator have ads?

Neither Gas Pipe Sizing Calculator nor Air Flow Conversion Calculator shows ads.

### Which is updated more often, Gas Pipe Sizing Calculator or Air Flow Conversion Calculator?

Gas Pipe Sizing Calculator ships an update every 13 months, and Air Flow Conversion Calculator every 47 months. Most recently, Gas Pipe Sizing Calculator was updated on November 1, 2026 and Air Flow Conversion Calculator on November 2, 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.*