Best Duct Apps

204+ iOS apps curated and reviewed

4.3 avg rating
13 free apps
Updated July 2026

If you already know Ductulator, this is the deeper bench. 204+ duct apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of July 2026.

Compare top Duct Apps (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Ductulator - Duct SizingDuctulator - Duct Sizing$3.994.7★ (272)NoNoJul 2026
2FieldFabFieldFabFree4.4★ (65)NoNoJul 2026
3Duct Calculator - DuctCalcDuct Calculator - DuctCalcFree5.0★ (7)NoYesJul 2026
4DigiductDigiductFree4.6★ (11)YesNoJul 2026
5Flat Pattern Bend CalculatorFlat Pattern Bend CalculatorFree4.6★ (151)NoYesJul 2026
6Digitales LüftungsaufmaßDigitales LüftungsaufmaßFree5.0★ (1)NoNoJul 2026
7SMACNA Duct-U-LatorSMACNA Duct-U-LatorFree5.0★ (1)NoNoMay 2026
8WinFab - Sheet Metal DuctulatorWinFab - Sheet Metal Ductulator$3.994.8★ (6)NoNoJul 2026

Top Picks for Duct

Ductulator - Duct Sizing#1

Ductulator - Duct Sizing by Wassim Murr

HVAC Duct Design Calculator
Editor's Choice
📊 Productivity
4.7(272 ratings)
$3.99
#51in Productivity
Ductulator - Duct Sizing screenshot 1
Ductulator - Duct Sizing screenshot 2
Ductulator - Duct Sizing screenshot 3
Ductulator - Duct Sizing screenshot 4
Ductulator - Duct Sizing screenshot 5
Ductulator - Duct Sizing screenshot 6

Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.

FieldFab#2

FieldFab by Robert Sale

CAD for the HVAC installer
Strong Contender
🎨 Graphics & Design
4.4(65 ratings)
Free
FieldFab screenshot 1
FieldFab screenshot 2
FieldFab screenshot 3
FieldFab screenshot 4
FieldFab screenshot 5

This app helps HVAC installers create precise ductwork transitions in the field using augmented reality. It streamlines the process of measuring, designing, and visualizing complex ductwork before cutting any materials, saving time and reducing errors.

Duct Calculator - DuctCalc#3

Duct Calculator - DuctCalc by Mikhail Nikitin

HVAC Sizing & Psychrometric
Worth Considering
🔧 Utilities
5.0(7 ratings)
FreeIn-App Purchases
Duct Calculator - DuctCalc screenshot 1
Duct Calculator - DuctCalc screenshot 2
Duct Calculator - DuctCalc screenshot 3
Duct Calculator - DuctCalc screenshot 4
Duct Calculator - DuctCalc screenshot 5
Duct Calculator - DuctCalc screenshot 6

This app provides professional HVAC duct sizing and psychrometric calculations in a single tool. It offers detailed calculations for various duct types and materials, along with comprehensive humid air property analysis. Designed for HVAC professionals, it replaces traditional ductulators with accurate digital functionality.

More Duct apps to explore

4
Digiduct
Digiduct
Digiduct
Duct-Sizing App
Free

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.

Duct sizing for rectangular, round, and flat oval ductsCustomizable dimensions with locked valuesDuct location intelligence for context-aware sizing
🔧 Utilities
(11)
ad-supported
5
Flat Pattern Bend Calculator
Flat Pattern Bend Calculator
Flat Pattern Bend Calculator
Cad for pipe elbow,cone,flange
Free

This app provides accurate flat pattern layouts for complex sheet metal shapes and transitions. It simplifies calculations for cones, frustums, cylinders, and various transition pieces, saving time and reducing errors in fabrication projects.

Cone calculationsFrustum calculationsTruncated cylinder layouts
🔧 Utilities
(151)
free with in-app purchases
6
Digitales Lüftungsaufmaß
Digitales Lüftungsaufmaß
Digitales Lüftungsaufmaß
Aufmaß für Lüftung neu gedacht
Free

Create detailed measurements for ventilation ducts and fittings with a 3D visualizer. Input data quickly, validate entries, and export to various formats. Designed for professionals in ventilation technology.

Digital measurement of ducts and fittings3D live view of componentsInput validation
📊 Productivity
(1)
free
7
SMACNA Duct-U-Lator
SMACNA Duct-U-Lator
SMACNA Duct-U-Lator
Size Simple HVAC Duct Runs
Free

This tool simplifies HVAC duct sizing for professionals. It quickly calculates dimensions for rectangular, round, and oval ducts based on airflow, friction loss, and velocity, ensuring optimal ventilation system performance.

Rectangular, round, and oval duct sizingReal-time calculation updatesConverts duct shapes and sizes
💼 Business
(1)
free
8
WinFab - Sheet Metal Ductulator
WinFab - Sheet Metal Ductulator
WinFab - Sheet Metal Ductulator
by pasquale dipaola
$3.99

This app calculates the correct dimensions for sheet metal ductwork. It simplifies the process of determining airflow and pressure drop for HVAC systems. Essential for professionals in the sheet metal and HVAC industries.

Duct sizing calculationAirflow determinationPressure drop calculation
💼 Business
(6)
paid
9
Duct-Fit
Duct-Fit
Duct-Fit
by Izumi Consulting,Inc.
Free
🔧 Utilities
(0)
10
HVAC Duct Size Calculator
HVAC Duct Size Calculator
HVAC Duct Size Calculator
by Alan Cave
$0.99

This utility app assists HVAC design professionals in calculating duct sizes. It goes beyond basic calculations to provide a list of suitable duct sizes based on design criteria, offering an intuitive interface for precise adjustments.

Duct size calculationVelocity, friction, and volume calculationsList of even-sized ducts
🔧 Utilities
(1)
paid
11
Duct Calculator Elite
Duct Calculator Elite
Duct Calculator Elite
HVAC Ductulator & Duct Sizing
$9.99

This app simplifies HVAC duct sizing calculations. It computes duct size, velocity, pressure drop, and flow rate with an intuitive interface. Supports various units and duct materials for precise HVAC design.

Calculate duct size, velocity, pressure drop, flow rateDuct Size by Airflow modeDuct Size by Dimension mode
🔧 Utilities
(225)
paid
12
HVACR Check & Charge
HVACR Check & Charge
HVACR Check & Charge
PT Charts Superheat Subcooling
Free

This app provides an instant mobile refrigerant charge calculator for HVACR applications. It supports various refrigerants and allows users to calculate the correct system charge based on superheat, subcooling, or airflow, along with environmental conditions.

Instant refrigerant charge calculatorSuperheat calculator (non-TXV)Subcooling calculator (TXV)
🔍 Reference
(17K)
free
13
DuctCalc.Ca
DuctCalc.Ca
DuctCalc.Ca
Ductulator Duct Calculator
Free

This utility app calculates duct dimensions and air velocity using two methods: Equal Friction and Velocity. It supports both round and rectangular ducts, offering precise calculations for HVAC professionals. Offline functionality is available with a subscription.

Duct sizing calculatorEqual Friction MethodVelocity Method
🔧 Utilities
(20)
free with in-app purchases
14
Duct Calculator
Duct Calculator
Duct Calculator
Ductulator & Duct Sizer
$19.99

This app allows HVAC professionals to quickly and accurately size new ducts or calculate the performance of existing ones. It supports both round and rectangular ductwork, offering precise calculations through direct entry or intuitive sliders. The tool provides live updates and outputs key performance metrics.

Size round and rectangular ductworkAdjust airflow, diameter, width, and heightDirect number entry for precision
🔧 Utilities
(179)
free
15
Thermaflex Duct Calculator
Thermaflex Duct Calculator
Thermaflex Duct Calculator
by Gastite Products LLC
Free

This utility app helps HVAC engineers quickly calculate the recommended Thermaflex duct size for installations. Input project volume and friction loss to determine the optimal duct size based on established industry standards.

Calculate recommended duct sizeInput project volume and friction lossSelect Thermaflex product
🔧 Utilities
(1)
free
16
HVAC Duct Sizer
HVAC Duct Sizer
HVAC Duct Sizer
HVAC duct sizing and more...
$5.99

This app provides quick and simple HVAC duct sizing analysis. It allows users to calculate duct dimensions based on airflow or existing dimensions, and can also determine a range of duct sizes. Results can be emailed for further analysis.

Duct sizing by airflowDuct sizing by dimensionsRange of duct sizes calculation
🔧 Utilities
(8)
free with in-app purchases
17
Ductalator
Ductalator
Ductalator
HVAC Duct Sizing Calculator
Free
📊 Productivity
(0)
18
DuctPro
DuctPro
DuctPro
HVAC Duct Sizing Calculator
Free
🔧 Utilities
(0)
19
Duct Calculator.
Duct Calculator.
Duct Calculator.
HVAC Airflow & Duct Sizing
Free
📊 Productivity
(0)
20
ASHRAE HVAC Duct Sizer
ASHRAE HVAC Duct Sizer
ASHRAE HVAC Duct Sizer
HVAC Duct Sizing and more....
$5.99

Calculate HVAC duct sizes using the constant friction method. Input airflow or dimensions to determine duct sizes, velocity, and friction loss. Supports rectangular, round, and oval ducts with adjustable air temperature and pressure.

Constant friction method duct sizingSize by airflow or dimensionsRange of duct sizes calculation
💼 Business
(0)
paid

FAQ about Duct

What are the best duct apps for iPhone?
Ductulator - Duct Sizing tops our duct apps ranking as of July 2026, with a 4.7-star average from 272 App Store ratings, and it's priced at $3.99.
Yes — 13 of the top duct apps we rank are free to download, including FieldFab and Duct Calculator - DuctCalc.
Ductulator - Duct Sizing has no ads and has no in-app purchases, according to its App Store listing as of July 2026.
We track 204+ duct apps on the iOS App Store as of July 2026, ranked by rating, recency, and analysis of real user reviews.
Ductulator is a mobile application designed to instantly calculate HVAC duct sizes. It allows users to determine accurate duct dimensions based on airflow, friction rate, or velocity, eliminating the need for manual chart lookups.
Key features include instant calculation of suitable duct sizes based on friction rate or velocity, support for both IP and SI units, a detailed sizing mode for adjusting parameters, and compatibility with rectangular, circular, and flexible ducts.

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