HVAC Pipe Sizer vs Grain SA
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 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
Grain SA
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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
Verdict
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
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 12 months, Grain SA monthly. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.
| Parameter | HVAC Pipe Sizer | Grain SA |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 12 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 10.2 — better |
| Further details — not scored | ||
| Size | 18 MB | 98 MB |
| Age rating | 4+ | 4+ |
| Developer | Carmel Software Corporation | 4SIGHT SYSTEMS (PTY) LTD |
In-app purchases
HVAC Pipe Sizer
- HVAC Equipment Locator$9.99
Grain SA
No in-app purchases








