Report updated Jun 18, 2026
Duct Calculator - DuctCalc
For hVAC engineers, mechanical contractors, and MEP design professionals requiring on-site duct sizing and air property calculations.
Duct Calculator - DuctCalc is an established utilities app that is completely free. With a 4.5/5 rating from 23 reviews, it shows polarized user reception.
What is Duct Calculator - DuctCalc?
DuctCalc is an HVAC utility app for iOS providing duct sizing and psychrometric calculations for engineers and contractors.
Users hire the app to consolidate two essential HVAC workflows into one interface, removing the need to switch between separate tools during on-site design tasks.
Current Momentum
v1.0 · 5mo ago
Zombie- Released initial version in Jan 2026.
- Maintains steady utility-focused feature set.
Active Nemesis
HVAC-calculator
By Trond Rossvoll
Other Rivals
7-Day Rank Pulse 🇺🇸
UtilitiesNo ranking data
Rating Pulse 🇺🇸
What makes this app unique?
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What Are The Key Features?
Combines duct sizing and psychrometric analysis in one interface, removing the need to switch between separate tools.
Calculates round, rectangular, and flexible ductwork dimensions using ASHRAE-compliant formulas with forward and reverse modes.
Analyzes humid air properties including enthalpy, specific volume, and saturation pressure with interactive chart visualization.
How much does it cost?
- Free version with full feature access
The app is currently offered as a free utility with no visible subscription or IAP gates.
Who Built It?
Mikhail Nikitin
View Publisher Intel →Enrichment in progress
Publisher profile available very soon
What other apps does Mikhail Nikitin make?
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What do users think recently?
Analysis in progress, available soon
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Duct Calculator - DuctCalc?
Where is it available?
Localized markets (1)
How's The Utilities Market?
How does it evolve in the Utilities market?
DuctCalc operates as a specialized utility in the HVAC engineering space, competing against legacy calculators by offering a modern interface. The absence of monetization signals a focus on user acquisition over immediate revenue generation.
Rank progression
1 active ranking tracked — 30-day window
Which niche is Duct Calculator - DuctCalc in?
to calculate hvac duct sizing and psychrometrics
Explore the full Hvac Engineering Calculators niche
Every app in this space — 5 tracked, the niche's live rankings, and Marlvel's editorial take on the job-to-be-done.
The rivals identified
Nemeses(1)
This app directly targets the same professional HVAC engineering audience by providing specialized technical calculations for ductwork and system efficiency.
Differentiators
- Includes specialized SFP and heat recovery efficiency calculations missing from our current core feature set.
- Focuses on broader mechanical system performance metrics rather than just physical duct sizing and psychrometrics.
Head to head
The nemesis is stagnant; we should aggressively capture its user base by implementing its unique efficiency calculations into our modern, updated interface.
Same space(4)
While focused on measurement, this app competes for the same 'utility tool' screen real estate used by contractors and field technicians.
Differentiators
- Utilizes camera integration for real-time physical environment analysis which our app currently lacks.
- Offers dual measurement modes that provide versatility for general construction tasks beyond HVAC-specific sizing.
This app serves the same professional utility market by providing technical calculators for bandwidth and resolution, mirroring our focus on precision tools.
Differentiators
- Features a highly specialized IP and bandwidth calculator suite for network and systems engineers.
- Maintains a high-quality, modern interface that appeals to the same professional demographic as our app.
This is a professional-grade measurement tool that competes for the attention of field professionals who require reliable, high-precision calculation utilities.
Differentiators
- Includes advanced data documentation features allowing users to save and export measurement results for reports.
- Provides camera-based measurement capabilities that offer a more intuitive workflow for on-site field measurements.
This app competes for the same 'specialized calculator' utility category, demonstrating high user engagement through terrain-specific optimization features.
Differentiators
- Offers terrain-specific optimization modes that provide tailored results based on complex environmental variables.
- Maintains a high volume of user reviews, indicating strong market penetration and trust in its calculation accuracy.
New entrants(2)
A new entrant in the construction utility space that combines material calculation with commercial inquiry systems.
Differentiators
- Integrates a commercial inquiry system directly into the calculator to bridge the gap between estimation and procurement.
This newcomer provides structural analysis tools that overlap with the technical calculation needs of our engineering user base.
Differentiators
- Supports complex structural analysis and influence line computation, appealing to engineers needing more than basic sizing.
Compare Duct Calculator - DuctCalc against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Duct Calculator - DuctCalc
Strengths to defend, gaps to attack
Core Strengths
- Dual-function interface replaces multiple tools, reducing workflow friction for field technicians.
Critical Frictions
- No cloud-save or data-export functionality for professional reporting.
- Free-only model lacks a clear revenue path.
Growth Levers
- Integration of advanced system-efficiency metrics could capture the power-user segment.
Market Threats
- Stagnant feature development compared to the nemesis's specialized engineering metrics.
What are the next best moves?
Ship data-export features because professional MEP firms require documentation for reporting → increase professional-tier adoption.
Professional users require documentation for reporting, which is currently missing.
Trade-off: Pause the psychrometric chart UI refresh — data export has higher professional-user impact.
Pivot to a freemium model because the current free-only strategy lacks a sustainable revenue path → capture long-term development capital.
The current free-only model provides no clear path to sustain long-term development.
Trade-off: Deprioritize new duct material support — monetization is critical for app survival.
Audit nemesis feature set because missing efficiency metrics are the primary churn risk for engineering users → maintain competitive parity.
The nemesis includes efficiency metrics that our app currently lacks.
Trade-off: Same-quarter capacity available — no major lever displaced.
A counter-intuitive read
The app's current free-only model is a strategic advantage for rapid market penetration, as it lowers the barrier to entry for students and junior engineers who will eventually influence firm-wide software procurement.
Feature Gaps vs Competitors
- SFP and heat recovery efficiency calculations (available in HVAC-calculator but absent here)
- Data export for professional reporting (available in Angle Meter PRO but absent here)
Key Takeaways
DuctCalc succeeds by consolidating essential HVAC tools into a modern interface, but it lacks the professional reporting and advanced efficiency metrics needed to retain power users, so the PM should prioritize data-export features to secure professional adoption.
Where Is It Heading?
Stable
The HVAC utility market is shifting toward integrated workflows that support documentation and reporting. DuctCalc is currently positioned as a basic utility, which leaves it vulnerable to competitors that offer more advanced engineering metrics and reporting capabilities.
The dual-function interface provides a clear utility advantage over single-purpose calculators, which should drive steady adoption among field technicians.
The lack of professional reporting features limits the app's utility for MEP firms, which will likely cap the total addressable market.