Comparison

HVAC Psychrometric Plus vs Pipe Sizer

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

Head to head
About

HVAC Psychrometric Plus

Perform single-state and mixed-air psychrometric calculations quickly and easily. Select input parameters and view updated results on a single screen. Supports 23 input combinations and offers email/spreadsheet export.

Highlights
  • Single-state psychrometric calculations
  • Mixed-air psychrometric calculations
  • 23 input parameter combinations
  • Real-time result updates
  • Universal app for iPhone and iPad
  • Email and spreadsheet export
Features
Read full description

The "HVAC Psychrometric Plus" app is the #1 selling psychrometric application for the Apple iPhone and iPad. Thousands of happy users have downloaded this useful application for performing quick and simple psychrometric analysis. Just a few reasons why you should buy this application: 1. The Psych Plus is a universal app that it is optimized for the iPhone and iPad. 2. This app was developed by Carmel Software, a company that has been developing software for 25+ years. We are experts in software design and HVAC analysis. 3. It allows you to easily perform single-state and mixed-air HVAC psychrometric calculations. 4. Select and update all input parameters and view the calculated results all in the same screen without switching from one screen to another. 5. Select from 23 different combinations of any 2 input parameters such as "Humidity Ratio / Dewpoint Temperature" and much more. 6. Immediately view updated results as you change the input values using the on-screen slider control. You can specify how much to increase or decrease values as you slide the indicator along the slider mechanism. 7. Send an HTML email and a spreadsheet attachment of all of the single-state and mixed-air inputs and results This application contains two separate input modes. The 1st input mode is the "Single-State" mode that allows you to specify 2 psychrometric parameters for a single stream of air and view the remaining 6 calculated values. You can quickly toggle through 23 different combinations of the 2 input parameters and instantly view the calculated results, all on the same screen. The 2nd input mode is the "Mixed-Air" mode that allows you to specify 2 psychrometric parameters for each of two air streams to calculate the mixed air psychrometric conditions. Once again, you can toggle through 23 combinations of the 2 input parameters and view all results in one screen. The following input and output value-types are displayed: 1. Dry-bulb temperature 2. Humidity ratio 3. Relative Humidity 4. Wet-bulb temperature 5. Partial pressure 6. Enthalpy 7. Specific volume 8. Dewpoint temperature 9. Total airflow or mass flow (for mixed-air calcs, only) You can specify additional parameters such as the altitude of the air being analyzed, the atmospheric pressure, different types of units such as degrees F or R, and English or Metric units. The "HVAC Psychrometric 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 analysis software and incorporated it into their leading Autodesk Revit software product. In addition, ASHRAE has hired Carmel Software to develop custom mobile apps to accompany their various standards. We also offer the following apps for the iPhone/iPad: 1. HVAC Residential Load Calcs 2. HVAC Load Plus 3. HVAC Duct Sizer 4. HVAC Pipe Sizer – Gas Low Pressure 5. HVAC Pipe Sizer - Gas High Pressure 6. HVAC Pipe Sizer – Liquid 7. HVAC Pipe Sizer – Steam 8. Steam Tables 9. HVAC Toolkit 10. Psychrometric LT 11. HVAC Pipe Sizer Plus 12. HVAC Pipe Sizer Gas Plus 13. HVAC Quick Load 14. HVAC ResLoad-J 15. HVAC Equipment Locator 16. HVAC Psych HD

About

Pipe Sizer

This app helps water piping system engineers and designers quickly and accurately design and analyze piping systems. It offers direct input for flow, friction, or velocity, with live calculation updates and support for various units and pipe materials.

Highlights
  • Quickly size new piping systems
  • Analyze existing piping systems
  • Direct input for flow, friction, or velocity
  • Live calculation updates
  • Supports SI and IP units
  • Works with steel, copper, and PVC pipes
  • Includes fluid data for water and glycols
Features
Read full description

The Pipe Sizer App for iOS has been designed to help water piping system engineers and designers quickly and accurately design new piping systems, and analyze existing pipping systems. Quickly size new and analyze existing piping systems on your iPhone or iPad. • Enter flow, friction rate or velocity numbers directly for maximum accuracy. • Use the sliders for quick calculations. • Calculations update live, giving you quick feedback on your design. • Lock flow rate, friction rate or velocity to size the pipe based on your input criteria. • Works for both SI and IP units. • Supports steel, copper and PVC piping. • Includes fluid data for: • Water • Ethylene glycol (10-90% by volume) • Propylene glycol (10-90% by volume) Put your plastic sizing wheel in the drawer. Have a modern design tool with you wherever you go. Note: This application (App) is provided for use by qualified piping system engineers and designers and is not a substitute for appropriate design services. When in doubt, contact a design professional.

Screenshots

HVAC Psychrometric Plus4 screens
Pipe Sizer2 screens

Verdict

The call

The clearest difference is rating: Pipe Sizer at 4.8 against HVAC Psychrometric Plus's 3.0. Pipe Sizer also leads on in-app purchases (none vs 1) and review sentiment (100% vs 73%). HVAC Psychrometric Plus's advantage is price ($6.99 vs $12.99) and update cadence (every 6 months vs every 17 months). On ads, monetization model, device support and iOS requirement 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 Psychrometric Plus costs $6.99 and Pipe Sizer $12.99 up front. HVAC Psychrometric Plus sells 1 one-off in-app purchase. Pipe Sizer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Pipe Sizer holds the better App Store score, 4.8 against 3.0. That said, the two scores are not equally well evidenced: Pipe Sizer has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 73% of HVAC Psychrometric Plus's written reviews are positive against 100% of Pipe Sizer's.

UpkeepUpdate frequency

HVAC Psychrometric Plus ships an update every 6 months, Pipe Sizer every 17 months. The most recent releases landed on October 27, 2026 and October 7, 2026 respectively.

Scorecard6 real differences · 4 level
HVAC Psychrometric Plus versus Pipe Sizer: the parameters behind the verdict, then further details
ParameterHVAC Psychrometric PlusPipe Sizer
Price$6.99 — better$12.99
Rating3.0 (2 ratings)4.8 (10 ratings) — better
Positive reviews72.7% of reviews100.0% of reviews — better
Number of ratings210 — better
Update frequencyEvery 6 months — betterEvery 17 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS17.016.6 — better
Further details — not scored
Size1 MB2 MB
Age rating+44+
DeveloperCarmel Software CorporationPheinex, LLC

Customer experience

HVAC Psychrometric Plus

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews11 reviews
Positive72.7%
Neutral0.0%
Negative27.3%

Pipe Sizer

All ratings10 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

HVAC Psychrometric Plus

One-time1
  • HVAC Equipment Locator$9.99
None

Pipe Sizer

No in-app purchases

Questions

Is HVAC Psychrometric Plus free?
HVAC Psychrometric Plus costs $6.99, and also offers in-app purchases.
Is Pipe Sizer free?
Pipe Sizer costs $12.99, with no in-app purchases.
Which has better reviews, HVAC Psychrometric Plus or Pipe Sizer?
Pipe Sizer is rated higher. HVAC Psychrometric Plus averages 3.0 out of 5 from 2 ratings, while Pipe Sizer averages 4.8 from 10 ratings.
Do HVAC Psychrometric Plus or Pipe Sizer have ads?
Neither HVAC Psychrometric Plus nor Pipe Sizer shows ads.
Which is updated more often, HVAC Psychrometric Plus or Pipe Sizer?
HVAC Psychrometric Plus ships an update every 6 months, and Pipe Sizer every 17 months. Most recently, HVAC Psychrometric Plus was updated on October 27, 2026 and Pipe Sizer on October 7, 2026.

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