Comparison

HVAC Pipe Sizer vs Slacker Virtual Remote

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

This utility app helps engineers quickly size high-pressure gas piping systems. Input flow, pressure, and pipe properties to calculate diameters, velocity, and equivalent length. Supports English and metric units with built-in tables for various pipe materials.

Highlights
  • High-pressure gas pipe sizing
  • Input flow, pressure, and pipe parameters
  • Calculate exact/nominal diameters
  • Determine velocity and equivalent length
  • Supports English and metric units
  • Includes pipe fitting tables
  • Universal app for iPhone and iPad
Features
Read full description

The "HVAC Pipe Sizer - Gas High" application allows you to quickly size a simple high pressure (> 1.5psi) gas piping system by inputting a number of piping and gas properties. This is now a universal app that works on both the iPhone and iPad and sizes the screen size accordingly. You can specify the total gas flow in ft^3/hr (m^3/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 downtream 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 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

Slacker Virtual Remote

Transform your smartphone into a remote display for a digital suspension tuner. View real-time measurements and control device functions like reset and auto-zero. This version offers core remote capabilities without saving settings.

Highlights
  • Remote display for suspension tuner
  • Real-time measurement viewing
  • Control reset function
  • Control auto-zero function
  • Bluetooth connectivity
Features
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Slacker Virtual Remote allows you to use your smartphone as a remote display for the new Motool Slacker Digital Suspension Tuner V4 with Bluetooth®. Take real-time measurements, measurements and control Slacker with the Reset and Auto Zero buttons. This is a "light" version of the virtual remote in the Motool Service Assistant App, you can not save settings. For virtual remote with MTB Mode and to save bikes and settings, install Service Assistant.

Screenshots

HVAC Pipe Sizer4 screens
Slacker Virtual Remote4 screens

Verdict

The call

The clearest difference is price: Slacker Virtual Remote at Free against HVAC Pipe Sizer's $4.99. Slacker Virtual Remote also leads on iOS requirement (12.1 vs 15.6). On rating, review sentiment, ratings volume and update cadence 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

Slacker Virtual Remote is free to download; HVAC Pipe Sizer costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for HVAC Pipe Sizer against 5.0 for Slacker Virtual Remote. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

HVAC Pipe Sizer ships an update every 8 months, Slacker Virtual Remote every 6 months. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
HVAC Pipe Sizer versus Slacker Virtual Remote: the parameters behind the verdict, then further details
ParameterHVAC Pipe SizerSlacker Virtual Remote
Price$4.99Free — better
Rating5.0 (3 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings3 — better2
Update frequencyEvery 8 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.612.1 — better
Further details — not scored
Size17 MB27 MB
Age rating4+4+
DeveloperCarmel Software CorporationMotool Inc

Customer experience

HVAC Pipe Sizer

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Slacker Virtual Remote

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

HVAC Pipe Sizer

No in-app purchases

None

Slacker Virtual Remote

No in-app purchases

Questions

Is HVAC Pipe Sizer free?
HVAC Pipe Sizer costs $4.99, with no in-app purchases.
Is Slacker Virtual Remote free?
Slacker Virtual Remote is free to download, with no in-app purchases.
Which has better reviews, HVAC Pipe Sizer or Slacker Virtual Remote?
HVAC Pipe Sizer and Slacker Virtual Remote are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.
Do HVAC Pipe Sizer or Slacker Virtual Remote have ads?
Neither HVAC Pipe Sizer nor Slacker Virtual Remote shows ads.
Which is updated more often, HVAC Pipe Sizer or Slacker Virtual Remote?
HVAC Pipe Sizer ships an update every 8 months, and Slacker Virtual Remote every 6 months. Most recently, HVAC Pipe Sizer was updated on October 15, 2026 and Slacker Virtual Remote on October 3, 2026.

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