# HVAC Pipe Sizer vs BiltOn US

The clearest difference is price: BiltOn US at Free against HVAC Pipe Sizer's $7.99. BiltOn US also leads on in-app purchases (none vs 1) and review sentiment (100% vs 80%). HVAC Pipe Sizer's advantage is rating (5.0 vs 4.6). On ads and device support there is nothing between them.

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

HVAC Pipe Sizer holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: BiltOn US has 11 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 80% of HVAC Pipe Sizer's written reviews are positive against 100% of BiltOn US's, so the app with the better star average is not the one people write more warmly about.

HVAC Pipe Sizer ships an update every 10 months, BiltOn US every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | HVAC Pipe Sizer | BiltOn US |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204/reviews)** | [4.6 (11 ratings)](https://appshunter.io/ios/app/bilton-us/id1607962580/reviews) |
| Number of ratings | 1 | **11** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 68 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Beti Digital Services](https://appshunter.io/developer/1602925448) |

## 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 |


### BiltOn US

[App page](https://appshunter.io/ios/app/bilton-us/id1607962580)

This platform helps construction companies manage site operations and worker safety. It offers tools to streamline workflows, saving time and money. Access and oversee projects from any device with this cloud-based solution.

**Highlights:** Cloud-based platform, Workflow supervision, Worker safety coordination, Streamline work processes, Project oversight, Cross-device accessibility

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

**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 BiltOn US free?

BiltOn US is free to download, with no in-app purchases.

### Which has better reviews, HVAC Pipe Sizer or BiltOn US?

HVAC Pipe Sizer is rated higher. HVAC Pipe Sizer averages 5.0 out of 5 from 1 ratings, while BiltOn US averages 4.6 from 11 ratings.

### Do HVAC Pipe Sizer or BiltOn US have ads?

Neither HVAC Pipe Sizer nor BiltOn US shows ads.

### Which is updated more often, HVAC Pipe Sizer or BiltOn US?

HVAC Pipe Sizer ships an update every 10 months, and BiltOn US every 3 months. Most recently, HVAC Pipe Sizer was updated on October 24, 2026 and BiltOn US on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*