Comparison

HVAC Pipe Sizer vs Grain SA

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 now 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

Grain SA

Features
Read full description

Mobile survey data capturing for authorized users of the Grain SA platform. The app makes capturing pig farm data more efficient and works online and offline. Features include: • Open and submit surveys in your account • View your completed survey history • Mobile data registration for grain producing business entities • Authorized veterinarians gain access the Passive Disease Surveillance surveys. • Authorized business development managers gain access to Farm Visit- and Mentorship surveys The Grain SA is an integrated platform that offers stakeholders in the South African grain value chain a protected environment to share information and facilitate interactions that create value and drive competitiveness, sustainability and food safety in the grain industry. Our app is free to download and use by authorized users. Authorization is granted by the Grain SA administration. Administration can be contacted at members@grainsa.co.za. Don't forget to synchronize unsynced actions before updating the app.

Screenshots

HVAC Pipe Sizer4 screens
Grain SA4 screens

Verdict

The call

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 12 months). 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

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.

UpkeepUpdate frequency

HVAC Pipe Sizer ships an update every 12 months, Grain SA monthly. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.

Scorecard4 real differences · 6 level
HVAC Pipe Sizer versus Grain SA: the parameters behind the verdict, then further details
ParameterHVAC Pipe SizerGrain SA
Price$7.99Free — better
Rating5.0 (1 ratings) — better—
Positive reviews80.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 12 monthsMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.610.2 — better
Further details — not scored
Size18 MB98 MB
Age rating4+4+
DeveloperCarmel Software Corporation4SIGHT SYSTEMS (PTY) LTD

In-app purchases

1 purchases

HVAC Pipe Sizer

One-time1
  • HVAC Equipment Locator$9.99
None

Grain SA

No in-app purchases

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 12 months, and Grain SA monthly. Most recently, HVAC Pipe Sizer was updated on September 9, 2026 and Grain SA on September 8, 2026.

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