# HVAC Pipe Sizer vs Grain SA

The clearest difference is price: Grain SA at Free against HVAC Pipe Sizer's $7.99. Grain SA also leads on in-app purchases (none vs 1) and update cadence (monthly vs every 10 months). On ads and device support there is nothing between them.

Grain SA is free to download; HVAC Pipe Sizer costs $7.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase. Grain SA asks for nothing beyond the download.

HVAC Pipe Sizer ships an update every 10 months, Grain SA monthly. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | Grain SA |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Monthly** |
| Monetization | Paid | — |
| Size | 1 MB | 98 MB |
| Requires iOS | 17.0 | **10.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [4SIGHT SYSTEMS (PTY) LTD](https://appshunter.io/developer/656095757) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204)

Calculate gas piping systems for low and high pressure. Input flow, pressure, or diameter to find pipe sizes, velocity, and equivalent lengths. Supports English and metric units, with extensive pipe fitting data.

**Highlights:** Low and high pressure gas pipe sizing, Calculate flow, pressure drop, diameter, and velocity, Universal app for iPhone and iPad, English and metric unit support, Built-in pipe fitting equivalent length tables, Slider controls for quick adjustments

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### Grain SA

[App page](https://appshunter.io/ios/app/grain-sa/id1665831580)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $7.99, and also offers in-app purchases.

### Is Grain SA free?

Grain SA is free to download, with no in-app purchases.

### Do HVAC Pipe Sizer or Grain SA have ads?

Neither HVAC Pipe Sizer nor Grain SA shows ads.

### Which is updated more often, HVAC Pipe Sizer or Grain SA?

HVAC Pipe Sizer ships an update every 10 months, and Grain SA monthly. Most recently, HVAC Pipe Sizer was updated on October 24, 2026 and Grain SA on October 11, 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.*