Comparison

HVAC Toolkit Ultimate vs Dilution +

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

Dilution +

Features
Read full description

Dilution+ - The Ultimate Dilution Calculator! Simplify your lab work and solution preparation with Dilution+, the app designed for scientists, students, and professionals who need quick and accurate dilution calculations. Whether you’re in a lab, classroom, or working on personal projects, this app ensures precision and saves you valuable time. Key Features: • Intuitive Interface: Quickly input the initial concentration, desired final concentration, and final volume with a clean and user-friendly interface. • Accurate Calculations: Get instant results for how much of your initial solution to use and how much solvent to add. • Flexible Units: Work seamlessly with mass-to-volume ratios (e.g., mg/dl) or molar units (e.g., mol/l). Switch between units effortlessly to suit your needs. • Visual Feedback: See a visual breakdown of the dilution process with clear information on solution and solvent quantities. • Optimized Workflow: Designed for rapid data entry and instant results, perfect for busy professionals and students. Why Choose Dilution+? Stop wasting time with manual calculations and complex formulas. Let Dilution+ handle the math so you can focus on what matters. Whether you’re preparing a chemical solution, biological medium, or any diluted solution, this app is your go-to assistant. Start simplifying your dilutions today with Dilution+. Download now and make every drop count!

Screenshots

HVAC Toolkit Ultimate4 screens
Dilution +4 screens

Verdict

The call

The clearest difference is price: Dilution + at $0.99 against HVAC Toolkit Ultimate's $59.99. HVAC Toolkit Ultimate's advantage is update cadence (every 6 months vs every 24 months) and device support (3 vs 1). On ads and in-app purchases 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 Dilution + $0.99 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, Dilution + every 24 months. The most recent releases landed on August 27, 2026 and September 23, 2026 respectively.

Scorecard4 real differences · 6 level
HVAC Toolkit Ultimate versus Dilution +: the parameters behind the verdict, then further details
ParameterHVAC Toolkit UltimateDilution +
Price$59.99$0.99 — better
Rating3.0 (4 ratings) — better—
Positive reviews40.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 6 months — betterEvery 24 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better16.6
Further details — not scored
Size59 MB6 MB
Age rating4+4+
DeveloperCarmel Software CorporationArpacore B.V.

In-app purchases

None

HVAC Toolkit Ultimate

No in-app purchases

None

Dilution +

No in-app purchases

Questions

Is HVAC Toolkit Ultimate free?
HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.
Is Dilution + free?
Dilution + costs $0.99, with no in-app purchases.
Do HVAC Toolkit Ultimate or Dilution + have ads?
Neither HVAC Toolkit Ultimate nor Dilution + shows ads.
Which is updated more often, HVAC Toolkit Ultimate or Dilution +?
HVAC Toolkit Ultimate ships an update every 6 months, and Dilution + every 24 months. Most recently, HVAC Toolkit Ultimate was updated on August 27, 2026 and Dilution + on September 23, 2026.

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