HVAC Pipe Sizer vs BiltOn US
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC Pipe Sizer
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.
- 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
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The "HVAC Pipe Sizer - Gas Plus" application allows you to quickly size a simple low (less than or equal to 1.5 psi) and/or high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. This application combines the functionality of our popular "HVAC Pipe Sizer - Gas Low" and "HVAC Pipe Sizer - Gas High" applications. This app is a universal app meaning that it works on both the iPhone and iPad and adjusts its screen size accordingly. For low pressure gas piping, you can specify the total gas flow in ft3/hr (m3/hr) and one of either pressure drop (in. wg or Pa), pipe internal diameter (inches) or gas velocity (ft/s) parameters. The results include both the exact and nominal pipe diameters and the calculated velocity and total pipe equivalent length. If you are analyzing an existing pipe system, there is an option to input the existing pipe internal diameter and one of either pressure drop or gas velocity parameters to derive the calculated gas flow and other remaining properties. For high pressure gas piping, you can specify the total gas flow in ft3/hr (m3/hr), the upstream pressure (psig or kPa), and one of either downstream pressure (psig or kPa), pipe internal diameter (inches) or gas velocity (ft/s) parameters. The results include both the exact and nominal pipe diameters and the calculated velocity and total pipe equivalent length. If you are analyzing an existing pipe system, there is an option to input the existing pipe internal diameter, the upstream pressure, and one of either downstream pressure or gas velocity parameters to derive the calculated gas flow and other remaining properties. You can specify additional parameters such as the type of gas, various properties of the gas, the pipe material type, the total length of pipe, quantities for up to 11 different types of pipe fittings, and much more. You can also choose to display values in either english or metric units. This application includes built-in pipe fitting equivalent length and nominal pipe sizing tables for a wide variety of pipe material types and diameters. This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. You can also manually input exact values. This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539 The "HVAC Pipe Sizer - Gas Plus" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. In addition, we developed a number of customized apps for ASHRAE, DNV GL, and other organizations. We also offer the following additional apps for the iPhone and iPad: 1. HVAC Residential Load Calcs for iPhone and iPad 2. HVAC Quick Load Plus 3. HVAC Quick Load 4. HVAC Toolkit 5. HVAC Pipe Sizer – Gas Low Pressure 6. HVAC Pipe Sizer - Gas High Pressure 7. HVAC Pipe Sizer – Liquid 8. HVAC Pipe Sizer – Steam 9. Steam Tables 10. Psychrometric Plus 11. Psychrometric LT 12. HVAC Pipe Sizer Plus 13. HVAC Pipe Sizer Gas Plus 14. HVAC Toolkit Ultimate 15. HVAC Equipment Locator 16. HVAC ResLoad-J 17. HVAC Psych HD
BiltOn US
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.
- Cloud-based platform
- Workflow supervision
- Worker safety coordination
- Streamline work processes
- Project oversight
- Cross-device accessibility
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BiltOn is an advanced, cloud-based platform designed to allow construction companies to easily and efficiently supervise and coordinate workflows and worker safety on the site. BiltOn rapidly grew and developed into an extensive platform with various innovative tools and features enabling construction managers to streamline their work processes. Based on cutting-edge technology, BiltOn saves you time and money allowing you to easily access, manage, and oversee your project in every aspect, from any device.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | HVAC Pipe Sizer | BiltOn US |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.6 (11 ratings) |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 11 — better |
| Update frequency | Every 10 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 1 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | Carmel Software Corporation | Beti Digital Services |
Customer experience
HVAC Pipe Sizer
BiltOn US
In-app purchases
HVAC Pipe Sizer
- HVAC Equipment Locator$9.99
BiltOn US
No in-app purchases
Questions
Is HVAC Pipe Sizer free?
Is BiltOn US free?
Which has better reviews, HVAC Pipe Sizer or BiltOn US?
Do HVAC Pipe Sizer or BiltOn US have ads?
Which is updated more often, HVAC Pipe Sizer or BiltOn US?
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