HVAC ToolKit vs Duct Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC ToolKit
This application provides HVAC engineers with tools for design checks and quick calculations. It offers various calculators for ducting friction, pipe sizing, ventilation, and heat load estimations, with clear instructions and formulas. Users can switch between metric and imperial units, and English or Arabic languages.
- Friction loss calculations
- Pipe sizing tools
- Ventilation and pressurization calculators
- Heat load and pump head estimations
- Metric/Imperial unit support
- English/Arabic language options
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The HVAC ToolKit is an easy-to-use app that has been created to assist HVAC engineers in checking their designs and making quick calculations and estimations. The app includes helpful calculation tools for calculating friction losses in ducting, pipe sizing, parking ventilation, staircase pressurization, and estimating heat loads, pump head, fan ESP, among others, where the user is able to enter the required inputs and is given the calculated output. Each tool also includes instructions and abbreviated formulas that have been used to calculate the results. The app can be set to metric or imperial units and/or to the English or Arabic language. Users are expected to have some knowledge and understanding of HVAC engineering in order to use the tools properly. Users are also expected to check that the results are within an acceptable range for their respective projects. If you come across any inconsistencies while using the app or have any recommendations for additional inclusions, please contact us.
Duct Calculator
This professional HVAC utility assists engineers and technicians with precise duct sizing and airflow calculations for ventilation systems. It simplifies essential calculations for both design and installation work, improving on-site efficiency.
- Calculate duct sizes using airflow (CFM) and velocity (FPM)
- Supports rectangular and round duct sizing in inches
- Determine air flow rate in CFM
- Calculate air velocity in FPM
- Simple interface for fast on-site calculations
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Duct Calculator is a focused duct sizing tool for HVAC engineers, designers and installation technicians. Enter what you know and get the duct dimensions, airflow or air velocity you need, without a chart or a slide rule. CALCULATIONS - Duct size: find the required duct dimensions from airflow (CFM) and air velocity (FPM). - Airflow: determine the airflow rate in CFM. - Air velocity: determine velocity in FPM to help verify system performance. DUCT SHAPES - Round ducts - Rectangular ducts - Results shown in inches WHO IT IS FOR - HVAC engineers and designers checking a duct size during design work. - Installation technicians and contractors who need a quick answer on site. - Students learning how airflow, velocity and duct size relate. WHERE IT HELPS - Sizing a new supply or return run from a known CFM. - Checking whether an existing duct keeps velocity within your target. - Comparing a round duct with a rectangular one when space is tight. SIMPLE BY DESIGN A clean interface with only the inputs you need, so you get an answer quickly on the job. Duct Calculator is free to use. An optional one-time upgrade removes ads. Results are intended as a calculation aid. Always confirm designs against applicable codes and project requirements. Download Duct Calculator and size your next duct run. Privacy Policy : https://semiconhub.in/manager/privacy.html Terms and Condition : https://semiconhub.in/manager/tcondition.html
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Verdict
The clearest difference is price: Duct Calculator at Free against HVAC ToolKit's $9.99. Duct Calculator also leads on rating (4.7 vs 1.0) and ratings volume (3 vs 1). HVAC ToolKit's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 10 months). On ads 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
Duct Calculator is free to download; HVAC ToolKit costs $9.99 up front. Duct Calculator sells 1 one-off in-app purchase. HVAC ToolKit asks for nothing beyond the download.
Duct Calculator holds the better App Store score, 4.7 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
HVAC ToolKit ships an update every 3 months, Duct Calculator every 10 months. The most recent releases landed on September 29, 2026 and October 12, 2026 respectively.
| Parameter | HVAC ToolKit | Duct Calculator |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 1.0 (1 ratings) | 4.7 (3 ratings) — better |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 3 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 60 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Mohamad Jaber | Sachinbhai Surani |
Customer experience
HVAC ToolKit
Duct Calculator
In-app purchases
HVAC ToolKit
No in-app purchases
Duct Calculator
- Lifetime premium$9.99
Questions
Is HVAC ToolKit free?
Is Duct Calculator free?
Which has better reviews, HVAC ToolKit or Duct Calculator?
Do HVAC ToolKit or Duct Calculator have ads?
Which is updated more often, HVAC ToolKit or Duct Calculator?
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