Comparison

HVAC Pipe Sizer vs Fabrication Flat Pattern

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

Quickly size low-pressure gas piping systems by inputting flow, pressure drop, diameter, or velocity. Includes detailed gas and pipe properties, fitting data, and unit conversion.

Highlights
  • Low pressure gas pipe sizing
  • Input flow, pressure drop, diameter, or velocity
  • Calculate exact and nominal pipe diameters
  • Specify gas and pipe properties
  • Includes pipe fitting equivalent lengths
  • English and metric unit display
Features
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The "HVAC Pipe Sizer - Gas Low" application allows you to quickly size a simple low pressure (less than 1.5psi) gas piping system by inputting a number of piping and gas properties. You can specify the total gas flow in cuft/hr (CubicM/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. 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. The "HVAC Pipe Sizer - Gas Low" 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. All values can be displayed in English (IP) and Metric (SI) units. This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539 This 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. We also offer the following additional applications for the iPhone/iPad: 1. HVAC Duct Sizer 2. HVAC Pipe Sizer – Gas Low Pressure 3. HVAC Pipe Sizer - Gas High Pressure 4. HVAC Pipe Sizer – Liquid 5. HVAC Pipe Sizer – Steam 6. Steam Tables 7. Psychrometric Plus 8. Psychrometric LT 9. HVAC Pipe Sizer Plus 10. HVAC Pipe Sizer Gas Plus 11. HVAC Toolkit 12. HVAC Toolkit Ultimate 13. HVAC Residential Load Calcs 14. HVAC Load Plus 15. HVAC Equipment Locator 16. ASHRAE Duct Fitting Database 17. ASHRAE 62.1 Ventilation Load Calcs 18. HVAC Psych HD 19. HVAC ResLoad-J 20. HVAC Residential Load Calcs HD

About

Fabrication Flat Pattern

This app streamlines fabrication processes by generating accurate flat patterns for various industrial shapes like pipes, cones, and bends. It minimizes fabrication time and enhances precision for professionals in heavy industry and manufacturing.

Highlights
  • Pipe layout generation
  • Cone and bend pattern creation
  • Supports various industrial shapes
  • Minimizes fabrication time
  • Increases layout accuracy
  • Ideal for industrial professionals
Features
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Revolutionize your fabrication workflow with our comprehensive fabrication layout app! Designed to accelerate your fabrication process while ensuring unparalleled accuracy, this tool is a game-changer for professionals in pressure vessels, process equipment, welding, piping, insulation, ducting, heavy equipment, storage tanks, agitators, mechanical equipment, structures, industrial fabrication, heat exchangers, and more. Unlock a myriad of Fabrication Flat Pattern Options, including: Pipe Layout, Shell Layout, Pipe Flat Pattern Truncated Pipe Layout, Pipe Cut at Any Angle Flat Pattern Pipe to Pipe Intersection with Equal Diameters or Pipe Branch Connection Flat Pattern Eccentric Cone Layout Flat Pattern Miter Bend Layout Flat Pattern Screw Flight Layout Flat Pattern This app caters to a wide spectrum of shapes such as cones, shells, pipes, pipe branch connections, full cones, half cones, truncated cones, square to round transitions, round to square transitions, rectangular to round transitions, round to rectangular transitions, pyramids, truncated pyramids, spheres, dish ends, and much more. Key Features: Minimize fabrication time Increase accuracy in layout development Ideal for Production Engineers, Fabrication Engineers, Planning Engineers, Costing and Estimating Engineers, Project Engineers, Fabrication Contractors, Fabrication Supervisors, Fabrication Fitters, and Fabrication Workers. Elevate your fabrication game with this must-have tool for the modern industrial professional!

Screenshots

HVAC Pipe Sizer4 screens
Fabrication Flat Pattern4 screens

Verdict

The call

The clearest difference is review sentiment: HVAC Pipe Sizer at 100% against Fabrication Flat Pattern's 0%. HVAC Pipe Sizer also leads on rating (5.0 vs 1.0). Fabrication Flat Pattern's advantage is price ($3.99 vs $4.99) and iOS requirement (12.0 vs 15.6). On ratings volume, update cadence, ads and in-app purchases 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

HVAC Pipe Sizer costs $4.99 and Fabrication Flat Pattern $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

HVAC Pipe Sizer holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 100% of HVAC Pipe Sizer's written reviews are positive against 0% of Fabrication Flat Pattern's.

UpkeepUpdate frequency

HVAC Pipe Sizer ships an update every 8 months, Fabrication Flat Pattern every 6 months. The most recent releases landed on August 27, 2026 and September 21, 2026 respectively.

Scorecard4 real differences · 6 level
HVAC Pipe Sizer versus Fabrication Flat Pattern: the parameters behind the verdict, then further details
ParameterHVAC Pipe SizerFabrication Flat Pattern
Price$4.99$3.99 — better
Rating5.0 (2 ratings) — better1.0 (1 ratings)
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 8 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size17 MB38 MB
Age rating4+4+
DeveloperCarmel Software CorporationAjay Gorasiya

Customer experience

HVAC Pipe Sizer

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Fabrication Flat Pattern

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

HVAC Pipe Sizer

No in-app purchases

None

Fabrication Flat Pattern

No in-app purchases

Questions

Is HVAC Pipe Sizer free?
HVAC Pipe Sizer costs $4.99, with no in-app purchases.
Is Fabrication Flat Pattern free?
Fabrication Flat Pattern costs $3.99, with no in-app purchases.
Which has better reviews, HVAC Pipe Sizer or Fabrication Flat Pattern?
HVAC Pipe Sizer is rated higher. HVAC Pipe Sizer averages 5.0 out of 5 from 2 ratings, while Fabrication Flat Pattern averages 1.0 from 1 ratings.
Do HVAC Pipe Sizer or Fabrication Flat Pattern have ads?
Neither HVAC Pipe Sizer nor Fabrication Flat Pattern shows ads.
Which is updated more often, HVAC Pipe Sizer or Fabrication Flat Pattern?
HVAC Pipe Sizer ships an update every 8 months, and Fabrication Flat Pattern every 6 months. Most recently, HVAC Pipe Sizer was updated on August 27, 2026 and Fabrication Flat Pattern on September 21, 2026.

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