Comparison

HVAC Pipe Sizer vs BiltOn US

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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

About

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.

Highlights
  • Cloud-based platform
  • Workflow supervision
  • Worker safety coordination
  • Streamline work processes
  • Project oversight
  • Cross-device accessibility
Features
Read full description

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

HVAC Pipe Sizer4 screens
BiltOn US3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard8 real differences · 2 level
HVAC Pipe Sizer versus BiltOn US: the parameters behind the verdict, then further details
ParameterHVAC Pipe SizerBiltOn US
Price$7.99Free — better
Rating5.0 (1 ratings) — better4.6 (11 ratings)
Positive reviews80.0% of reviews100.0% of reviews — better
Number of ratings111 — better
Update frequencyEvery 10 monthsEvery 3 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size1 MB68 MB
Age rating4+4+
DeveloperCarmel Software CorporationBeti Digital Services

Customer experience

HVAC Pipe Sizer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

BiltOn US

All ratings11 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

HVAC Pipe Sizer

One-time1
  • HVAC Equipment Locator$9.99
None

BiltOn US

No in-app purchases

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.

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