Comparison

HVAC Toolkit Ultimate vs Systemiz

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

Systemiz

Features
Read full description

Systemiz - Documents, setup, commissioning, motors and drives Product library and motor and drive setup application Scan the nameplate of your motor and access all the important information related to your product. Systemiz App allows a simple motor and drive setting as well as an instantaneous access to all product documentation. A unique time gain! The Apps provides you with greater responsiveness and easier integration of our products within your systems. Main functions: Product library • Scan the QR code on the motor nameplate and access to all relevant product documentation (brochures, manuals, certificates, etc.) • Find the nearest contact to you • Save and share your favorite URLs Motor data: • Scan the QR code on the motor nameplate and obtain the necessary data to setup a drive (serial number, full designation, electrical characteristics, etc.) • Save your data sheets for a later use • Share and print your datasheets Other features: • Application available in French and English • Scalable application: it will soon integrate other features to make your life easier Please note: the application is currently only functional on our range of Dyneo + synchronous motors. Available soon: all the other information related to our other product ranges and much more !

Screenshots

HVAC Toolkit Ultimate4 screens
Systemiz4 screens

Verdict

The call

The clearest difference is price: Systemiz at Free against HVAC Toolkit Ultimate's $59.99. On update cadence, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Systemiz is free to download; HVAC Toolkit Ultimate costs $59.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

HVAC Toolkit Ultimate ships an update every 6 months, Systemiz every 8 months. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.

Scorecard1 real difference · 9 level
HVAC Toolkit Ultimate versus Systemiz: the parameters behind the verdict, then further details
ParameterHVAC Toolkit UltimateSystemiz
Price$59.99Free — better
Rating3.0 (4 ratings) — better—
Positive reviews40.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 6 months — betterEvery 8 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size59 MB56 MB
Age rating4+4+
DeveloperCarmel Software CorporationNIDEC LEROY-SOMER HOLDING

In-app purchases

None

HVAC Toolkit Ultimate

No in-app purchases

None

Systemiz

No in-app purchases

Questions

Is HVAC Toolkit Ultimate free?
HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.
Is Systemiz free?
Systemiz is free to download, with no in-app purchases.
Do HVAC Toolkit Ultimate or Systemiz have ads?
Neither HVAC Toolkit Ultimate nor Systemiz shows ads.
Which is updated more often, HVAC Toolkit Ultimate or Systemiz?
HVAC Toolkit Ultimate ships an update every 6 months, and Systemiz every 8 months. Most recently, HVAC Toolkit Ultimate was updated on October 12, 2026 and Systemiz on October 9, 2026.

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