Last updated 1mo ago

Duct Calculator: HVAC Sizing

By Vladimir Lukashov

Duct Calculator: HVAC Sizing is a professional HVAC utility for duct sizing and diagnostic checks on iOS.

Product velocity

Maintenance

updated 22d ago

Daily rank 🇺🇸

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Utilities

Sentiment

—

Nemesis

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Fragmented field

No rivals identified

The App DNA

What makes this app unique?

It removes the physical bulk and calculation limitations of cardboard slide rules for field technicians needing ASHRAE-compliant results.

For HVAC professionals and contractors requiring precise, physics-based duct sizing tools in the field.

What does it look like?

Key features

Equal-friction duct sizingedge

Calculates duct diameter or rectangular dimensions based on airflow and friction rate using Darcy-Weisbach physics.

Material-specific ASHRAE roughnessedge

Adjusts calculations for galvanized, duct board, or flexible duct materials based on specific ASHRAE roughness factors.

Duct check modestandard

Inputs existing duct dimensions to calculate current velocity, friction rate, and airflow capacity.

How much does it cost?

subscriptionFree trial availableSubscription required for full tool access

Subscription model gated by a free trial, positioning the tool as a professional utility rather than a one-time purchase.

Velocity

Maintenance developmentnew contentUX improvementsShow more...

The app maintains a maintenance-level cadence, with only one release identified in the recent window. Development is currently focused on expanding technical utility through material-specific friction calculations and diagnostic tools for existing ductwork. The current pace of one release every three weeks suggests a stable but low-frequency development cycle focused on feature-specific enhancements rather than rapid iteration.

See all version history

Who built it?

Vladimir Lukashov

6 apps tracked · Utilities

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Explore the full publisher profile

User Sentiment

What do users think recently?

How are ratings & reviews evolving?

App Store

0.00 · 0

Not enough recent reviews to extract reliable themes yet.

Read the full review analysis

Competition

Competitive landscape for Duct Calculator: HVAC Sizing

How's the Utilities market?

Duct Calculator: HVAC Sizing occupies the professional utility niche, competing directly with physical slide rules by offering digital ASHRAE-compliant calculations. The lack of public ratings suggests an early-stage market entry where professional trust remains the primary growth hurdle.

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The rivals identified

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The Analyst's Read

Key takeaways for Duct Calculator: HVAC Sizing

Where is it heading?

The professional HVAC utility market is shifting toward digital, physics-based tools that replace legacy physical slide rules. Duct Calculator: HVAC Sizing is well-positioned to capture this segment if it continues to prioritize Manual D compliance and professional-grade accuracy in its update cadence.

The latest release introduced material-specific ASHRAE roughness, demonstrating active feature investment rather than maintenance-only updates.
The current subscription-only model limits the top-of-funnel reach among casual contractors who prefer one-time purchases.

The SWOT

Core Strengths

Physics-based Darcy-Weisbach engine provides professional-grade accuracy
Material-specific ASHRAE roughness settings ensure Manual D compliance
Persistent friction rate settings reduce data-entry errors in multi-step design workflows

Critical Frictions 2 weaknesses inside

Growth Levers

Localized support for international duct standards could expand the addressable market
Integration with digital Manual D reporting tools could increase professional stickiness

Market Threats 2 threats identified

Next best moves

1 Invest · 1 Pivot

Invest in offline-first sync for calculation history because field technicians often work in low-connectivity zones → increase utility in remote job sites

+ 1 more prioritized move

The counter-intuitive read

The subscription model is an advantage, not a barrier: by charging recurring fees…

Read the full take

Bottom line

Focusing on physics-based accuracy for Manual D compliance would solidify the professional utility of Duct Calculator: HVAC Sizing, as the current subscription model requires a clear value proposition to displace traditional tools.

Unlock 2 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.

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FAQ

Is Duct Calculator: HVAC Sizing suitable for professional HVAC design?

Yes, it uses Darcy-Weisbach and Colebrook friction factors, which are the industry-standard methods behind professional ductulators and ASHRAE friction charts.

Does the app work for flexible duct sizing?

Yes, it includes material-specific ASHRAE roughness settings for flexible ducts, which require different friction rates than metal ductwork.

Is there a free version available?

The app offers a free trial, but full access to the sizing and diagnostic tools requires a subscription.

How does this compare to a physical ductulator?

It provides the same physics-based results as a physical slide rule but adds diagnostic features for existing ductwork and material-specific adjustments that physical tools cannot calculate.

Sources

[1] App Store

Report last updated Sep 24, 2026