Comparison

HVAC Toolkit vs Elbow

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

Head to head
About

HVAC Toolkit

This comprehensive toolkit offers essential HVAC calculations and tools for professionals. It combines multiple specialized applications into a single, convenient package for iPhone and iPad users.

Highlights
  • Equipment tracking and customization
  • Refrigerant pressure-temperature charts
  • Refrigerant charge calculations
  • Duct sizing
  • Cooling and heating load calculations
  • Psychrometric calculations
  • Steam tables
  • Pipe sizing for liquid, steam, and gas
Features
Read full description

The HVAC Toolkit app for the iPhone and iPad is the essential app for anyone in the HVAC industry. It includes a combination of many of our stand-alone iOS applications. Individually, the apps cost a total of $70. By purchasing the Toolkit, you pay only $24: 1. HVAC Equipment Locator 2. HVAC PT Chart 3. HVAC Refrigerant Charge 4. HVAC Duct Sizer 5. HVAC Quick Load 6. Psychrometrics 7. Steam Tables 8. Pipe Sizer - Liquid 9. Pipe Sizer - Steam 10. Pipe Sizer - Gas High 11. Pipe Sizer - Gas Low This is a universal app that works on both the iPhone and iPad. 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. The "HVAC PT Chart" module allows you to easily view the pressure-temperature properties of 75 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 75 common refrigerants. The "HVAC Duct Sizer" module allows you to quickly size one HVAC duct run and a range of duct sizes. 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 "HVAC Quick Load" module allows you to perform quick and simple HVAC cooling and heating load calculation analysis. You can specify the building type, total area, and # of people. The results include the total cooling and heating loads and airflows. The "Psychrometrics" module allows you to easily perform single-state and mixed-air HVAC psychrometric calculations for a wide range of barometric air pressures. The "Steam Tables" module allows you to calculate the properties of saturated or superheated steam by specifying 2 input properties. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run with 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 High/Low" module 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. This application includes all of the great features of the individual HVAC iOS applications such as the use of slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. It also allows you to specify different types of liquids, gases, pipe material types, fitting quantities, min and max ranges, and step values. All of the above modules display units in English or Metric. Also, all of the above modules allow you to send emails with inputs and results. The "HVAC Toolkit" 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. In addition, Carmel has developed customized apps for organizations such as ASHRAE, Mitsubishi Electric, and Pacific Gas and Electric, amongst others. We also offer all of the above modules as individual apps for the iPhone/iPad: 1. HVAC ResLoad-J 2. HVAC Psych HD 3. HVAC Duct Sizer 4. HVAC Pipe Sizers 5. Steam Tables 6. Psychrometric Plus 7. Psychrometric LT 8. HVAC Pipe Sizer Plus 9. HVAC Pipe Sizer Gas Plus 10. HVAC Quick Load 11. HVAC Load Plus 12. HVAC Residential Load Calcs 13. HVAC Toolkit Ultimate 14. HVAC ASHRAE 62.1 15. HVAC ResVent 62.2 16. HVAC ASHRAE DFDB 17. HVAC ASHRAE Psych Chart

About

Elbow

This tool simplifies the creation of accurate flat patterns for elbow fittings in sheet metal fabrication, HVAC, and piping. Input key parameters like angle and dimensions to instantly generate precise calculations for cutting and shaping materials, saving time and reducing errors.

Highlights
  • Calculate inner arc length
  • Determine elbow angle and cutting dimensions
  • Support custom angle inputs
  • Accurate flat pattern development
  • Quick and reliable results
Features
Read full description

Elbow Flat Pattern Calculator is a practical tool designed for professionals and learners involved in sheet metal fabrication, HVAC systems, piping, and related industries. It simplifies the process of creating accurate flat patterns for elbow fittings, helping users save time and reduce manual calculation errors. With an easy-to-use interface, the app allows users to input key parameters such as elbow angle and dimensions, and instantly generates precise calculations required for cutting and shaping materials. Key Features: - Calculate inner arc length of the elbow - Determine elbow angle and cutting dimensions - Support for custom angle inputs (e.g., 45°, 90°, or any required angle) - Accurate flat pattern development for fabrication - Quick and reliable results for professional use This app is especially useful for engineers, fabricators, HVAC technicians, and students who require precise measurements for ductwork, piping, or sheet metal projects. By automating complex calculations, it ensures better accuracy and improves overall workflow efficiency. In app purchase included : Weekly Premium Monthly Premium Privacy policy : https://chatlyst.in/privacy.html Terms and condition : https://chatlyst.in/tcondition.html

Screenshots

HVAC Toolkit4 screens
Elbow4 screens

Verdict

The call

HVAC Toolkit and Elbow both sit at 5.0 stars, but that hides the real split: 73% of HVAC Toolkit's written reviews are positive against 0% of Elbow's. HVAC Toolkit also leads on in-app purchases (none vs 2). Elbow's advantage is price (Free vs $23.99). On rating, ratings volume, update cadence and ads 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

Elbow is free to download; HVAC Toolkit costs $23.99 up front. Elbow sells 2 in-app purchases, starting at $4.99 per 7 days. HVAC Toolkit asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for HVAC Toolkit against 5.0 for Elbow. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews are what separate them: 73% of HVAC Toolkit's written reviews are positive against 0% of Elbow's.

UpkeepUpdate frequency

HVAC Toolkit ships an update every 6 months, Elbow every 4 months. The most recent releases landed on September 14, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
HVAC Toolkit versus Elbow: the parameters behind the verdict, then further details
ParameterHVAC ToolkitElbow
Price$23.99Free — better
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews73.3% of reviews — better0.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 6 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size50 MB58 MB
Age rating4+4+
DeveloperCarmel Software CorporationKantaben Gorasiya

Customer experience

HVAC Toolkit

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive73.3%
Neutral0.0%
Negative26.7%

Elbow

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

HVAC Toolkit

No in-app purchases

2 purchases

Elbow

Subscriptions2
  • Weekly$4.997 Days
  • Monthly$9.991 Month

Questions

Is HVAC Toolkit free?
HVAC Toolkit costs $23.99, with no in-app purchases.
Is Elbow free?
Elbow is free to download, with in-app purchases available.
Which has better reviews, HVAC Toolkit or Elbow?
HVAC Toolkit and Elbow are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do HVAC Toolkit or Elbow have ads?
Neither HVAC Toolkit nor Elbow shows ads.
Which is updated more often, HVAC Toolkit or Elbow?
HVAC Toolkit ships an update every 6 months, and Elbow every 4 months. Most recently, HVAC Toolkit was updated on September 14, 2026 and Elbow on September 22, 2026.

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