Comparison

Digiduct vs HVACsim

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

Head to head
About

Digiduct

This HVAC tool assists professionals with duct sizing calculations based on ASHRAE standards. It supports multiple duct shapes and offers intelligent features to ensure accurate and reliable designs for real-world scenarios.

Highlights
  • Duct sizing for rectangular, round, and flat oval ducts
  • Customizable dimensions with locked values
  • Duct location intelligence for context-aware sizing
  • Calculations based on CFM, pressure drop, or velocity
  • Alerts for exceeding pressure drop or velocity limits
Features
Read full description

The Digiduct app is a powerful tool designed for HVAC professionals, supporting everything from design calculations to real-time field verification. Built utilizing the equations and recommendations from the ASHRAE Fundamentals – Duct Design chapter, it ensures your calculations are accurate and reliable, saving you time and reducing errors. Key Features: • Multiple Shape Sizing Options: Supports sizing for rectangular, round, and flat oval ducts, offering flexibility for various duct designs. • Customizable Dimensions: For rectangular and oval ducts, users can lock in one dimension, and the app calculates the other, ensuring precise results based on CFM, pressure drop due to friction, or velocity. • Duct Location Intelligence: offers the user predefined parameters to use as starting point and reference when selecting duct sizes so users at HVAC experience level can make confident selections. Why Choose Digiduct? Unlike other duct sizing tools, Digiduct goes above and beyond. It doesn’t just provide basic size outputs—it evaluates the location and context of your duct (high-pressure vs. low-pressure, shaft vs. plenum), alerting you if your selection exceeds maximum pressure drop or velocity limits. This added layer of intelligence ensures higher accuracy and gives users confidence that their sizing is optimal for the application. Get the assurance of precision with Digiduct—designed to meet the demands of real-world HVAC scenarios.

About

HVACsim

This app offers interactive learning and real-world data analysis to help HVAC professionals diagnose and troubleshoot systems. It provides personalized training plans, skill assessments, and team management tools for contractors.

Highlights
  • Technical Knowledge Evaluator
  • Individualized Learning Plans
  • Real-World Data Analysis
  • Team Management Tools
  • Continuous Learning Library
Features
Read full description

Master HVAC Skills with the HVAC Simulator App! The HVAC Simulator app revolutionizes training by combining real-world data analysis with interactive learning. Designed for technicians, contractors, and educators, this app helps you build confidence in diagnosing and troubleshooting HVAC systems efficiently. Key Features Technical Knowledge Evaluator Assess your HVAC skills through realistic scenarios. Identify gaps in understanding and get targeted recommendations. Individualized Learning Plans (ILP) Personalized training paths tailored to your specific needs. Evolve and reassess as you progress, ensuring continuous improvement. Real-World Practice Analyze system data like electrical readings, pressures, and temperatures. Simulate real-life scenarios in a risk-free environment. Team Management Tools (for Contractors) Assess and track your team’s technical knowledge. Create custom in-house training programs based on performance data. Continuous Learning Stay updated with new HVAC technologies and techniques. Access a library of courses covering both basics and advanced topics. Why Choose HVAC Simulator? Build diagnostic accuracy with data-driven learning. Strengthen critical thinking and troubleshooting skills. Reduce callbacks with more efficient team training. Interactive and engaging simulations for practical learning. For Technicians: Boost your confidence and master HVAC diagnostics through hands-on scenarios. For Contractors: Empower your team with tools to create stronger, more skilled technicians. For Educators: Enhance classroom learning with real-world-focused training resources. Download HVAC Simulator Now and Start Your Journey to HVAC Mastery! Transform the way you learn, train, and excel in the HVAC industry today!

Screenshots

Digiduct4 screens
HVACsim4 screens

Verdict

The call

The clearest difference is rating: Digiduct at 4.6 against HVACsim's 2.6. Digiduct also leads on in-app purchases (none vs 1). HVACsim's advantage is iOS requirement (13.4 vs 26.2). On price, 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

Both are free to download. HVACsim sells 1 one-off in-app purchase. Digiduct asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Digiduct holds the better App Store score, 4.6 against 2.6. Both are backed by a comparable volume of ratings — 11 and 10 respectively.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 12, 2026 and September 20, 2026 respectively.

Scorecard4 real differences · 5 level
Digiduct versus HVACsim: the parameters behind the verdict, then further details
ParameterDigiductHVACsim
PriceFreeFree
Rating4.6 (11 ratings) — better2.6 (10 ratings)
Number of ratings11 — better10
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.213.4 — better
Further details — not scored
Size4 MB20 MB
Age rating4+4+
DeveloperSyska Hennessy GroupNauman Innovation Group LLC

Customer experience

Digiduct

All ratings11 ratings
Positive90.9%
Neutral0.0%
Negative9.1%

HVACsim

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

Digiduct

No in-app purchases

1 purchases

HVACsim

One-time1
  • Full Access$29.99

Questions

Is Digiduct free?
Digiduct is free to download, with no in-app purchases.
Is HVACsim free?
HVACsim is free to download, with in-app purchases available.
Which has better reviews, Digiduct or HVACsim?
Digiduct is rated higher. Digiduct averages 4.6 out of 5 from 11 ratings, while HVACsim averages 2.6 from 10 ratings.
Do Digiduct or HVACsim have ads?
Neither Digiduct nor HVACsim shows ads.
Which is updated more often, Digiduct or HVACsim?
Digiduct ships an update every 2 months, and HVACsim every 2 months. Most recently, Digiduct was updated on September 12, 2026 and HVACsim on September 20, 2026.

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