Comparison

HVAC Toolkit Ultimate 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 Toolkit Ultimate

This comprehensive application offers a suite of tools for HVAC professionals, including load calculations, equipment tracking, refrigerant charts, duct and pipe sizing, and psychrometric analysis. It consolidates multiple functionalities into a single, powerful utility for field and office use.

Highlights
  • Residential load calculations
  • Equipment nameplate data tracking
  • Refrigerant pressure-temperature charts
  • Superheat and subcool calculations
  • Duct and pipe sizing analysis
  • Psychrometric calculations
  • Steam table property calculations
Features
Read full description

This may just be the only HVAC app you will ever need. The HVAC Toolkit Ultimate from Carmel Software is a universal app that works on both the iPhone and iPad. It is the essential app for anyone in the HVAC industry. It is a compilation of most of the individual iPhone and iPad applications offered by Carmel Software plus bonus software. If you bought each of these apps separately, it would cost more than 2 times what the price of this app is. It includes: 1. HVAC Residential Load Calc HD (iPad version) 1. HVAC Residential Load Calcs (iPhone version) 1. HVAC Equipment Locator 2. HVAC PT Chart 3. HVAC Refrigerant Charge 4. HVAC Duct Sizer 2. HVAC Quick Load 6. ASHRAE Ventilation Calcs (iPhone version) 7. Psychrometrics 8. Steam Tables 9. HVAC Pipe Sizer - Liquid 10. HVAC Pipe Sizer - Steam 11. HVAC Pipe Sizer - Gas Low 12. HVAC Pipe Sizer - Gas High The "HVAC Residential Load Calcs" module allows you to perform comprehensive HVAC block and room-by-room load calculations for small commercial and residential buildings. You can easily use this module out in the field by taking advantage of the simplicity and power of the iPhone or iPad, and then email results back to your office. The "HVAC Equipment Locator" module allows you to track, share, and customize your equipment nameplate and maintenance data. The version here includes the ability to customize your input screens (this is usually an in-app purchase on the free stand-alone version of Locator, but it is included here). The "HVAC PT Chart" module allows you to easily view the pressure-temperature properties of 100 refrigerants. Think of this app as a digital version of the paper PT charts that you may have carried around with you in the past. The "HVAC Refrigerant Charge" module allows you to perform superheat and subcool refrigerant charge calculations on-the-fly. This app includes pressure-temperature data for over 100 common refrigerants including azeotropic (bubble/dew) versions of refrigerants. The "HVAC Duct Sizer" module allows you to perform quick and simple duct sizing analysis. You can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The results include both the exact and rounded height and width (or diameter) dimensions and the calculated velocity and friction loss. In addition, you can calculate for a range of duct sizes by specifying minimum and maximum friction loss and airflow values. The "HVAC Quick Load" module allows you to quickly calculate total heating and cooling loads for a wide variety of building types. The "Psychrometrics" module allows you to easily perform single-state and mixed-air HVAC psychrometric calculations for up to 23 different combinations of input parameters. The "Steam Tables" module allows you to calculate the properties of saturated or superheated steam by specifying 2 input properties. This module is also part of the "Pipe Sizer - Steam" module discussed below. The "ASHRAE Ventilation Calcs" module allows you to perform comprehensive minimum ventilation calculations for a wide variety of commercial buildings based upon ASHRAE Standard 62.11-2007 and 2010/2013 versions. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run for many different types of liquids (or fluids), pipe material and fitting types. The "HVAC Pipe Sizer - Steam" module allows you to size a steam pipe run, and it also includes a bonus steam table calculator. The "HVAC Pipe Sizer - Gas Low and Gas High" modules allows you to quickly size a simple low (less than or equal to 1.5 psi) and high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. All values can be displayed in English (IP) and Metric (SI) units. We also offer all of the above modules as individual apps, too.

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 Toolkit Ultimate4 screens
Pipe Sizer2 screens

Verdict

The call

The clearest difference is review sentiment: Pipe Sizer at 100% against HVAC Toolkit Ultimate's 40%. Pipe Sizer also leads on price ($12.99 vs $59.99) and rating (4.8 vs 3.0). HVAC Toolkit Ultimate's advantage is update cadence (every 6 months vs every 17 months) and iOS requirement (13.0 vs 16.6). On ratings volume, ads, in-app purchases and monetization model 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 Toolkit Ultimate costs $59.99 and Pipe Sizer $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Pipe Sizer holds the better App Store score, 4.8 against 3.0. Both are backed by a comparable volume of ratings — 4 and 10 respectively. Written reviews point the same way: 40% of HVAC Toolkit Ultimate's written reviews are positive against 100% of Pipe Sizer's.

UpkeepUpdate frequency

HVAC Toolkit Ultimate ships an update every 6 months, Pipe Sizer every 17 months. The most recent releases landed on August 27, 2026 and September 20, 2026 respectively.

Scorecard5 real differences · 5 level
HVAC Toolkit Ultimate versus Pipe Sizer: the parameters behind the verdict, then further details
ParameterHVAC Toolkit UltimatePipe Sizer
Price$59.99$12.99 — better
Rating3.0 (4 ratings)4.8 (10 ratings) — better
Positive reviews40.0% of reviews100.0% of reviews — better
Number of ratings410 — better
Update frequencyEvery 6 months — betterEvery 17 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13.0 — better16.6
Further details — not scored
Size59 MB2 MB
Age rating4+4+
DeveloperCarmel Software CorporationPheinex, LLC

Customer experience

HVAC Toolkit Ultimate

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews15 reviews
Positive40.0%
Neutral6.7%
Negative53.3%

Pipe Sizer

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

In-app purchases

None

HVAC Toolkit Ultimate

No in-app purchases

None

Pipe Sizer

No in-app purchases

Questions

Is HVAC Toolkit Ultimate free?
HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.
Is Pipe Sizer free?
Pipe Sizer costs $12.99, with no in-app purchases.
Which has better reviews, HVAC Toolkit Ultimate or Pipe Sizer?
Pipe Sizer is rated higher. HVAC Toolkit Ultimate averages 3.0 out of 5 from 4 ratings, while Pipe Sizer averages 4.8 from 10 ratings.
Do HVAC Toolkit Ultimate or Pipe Sizer have ads?
Neither HVAC Toolkit Ultimate nor Pipe Sizer shows ads.
Which is updated more often, HVAC Toolkit Ultimate or Pipe Sizer?
HVAC Toolkit Ultimate ships an update every 6 months, and Pipe Sizer every 17 months. Most recently, HVAC Toolkit Ultimate was updated on August 27, 2026 and Pipe Sizer on September 20, 2026.

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