Best Digiduct Apps

250+ iOS apps curated and reviewed

3.6 avg rating
18 free apps
Updated August 2026

Every iPhone needs a few good digiduct apps. We benchmark 250+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Digiduct Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1DigiductDigiductFree4.6★ (11)YesNoJul 2026
2DuctProDuctProFreeNoNoJun 2026
3Spiralite Duct SizerSpiralite Duct SizerFreeNoNoMay 2026
4Duct Mate: HVAC Duct SizerDuct Mate: HVAC Duct SizerFreeNoYesJul 2026
5DuctSizer ProDuctSizer ProFree5.0★ (2)NoNoAug 2026
6SimpleVentiSimpleVentiFreeYesNoMay 2026
7DuctSizeCalcDuctSizeCalc$2.992.0★ (1)NoNoJul 2026
8ASHRAE HVAC Duct SizerASHRAE HVAC Duct Sizer$5.99NoNoJun 2026

Top Picks for Digiduct

Digiduct#1

Digiduct by Syska Hennessy Group

Duct-Sizing App
Editor's Choice
🔧 Utilities
4.6(11 ratings)
Free
Digiduct screenshot 1
Digiduct screenshot 2
Digiduct screenshot 3
Digiduct screenshot 4
Digiduct screenshot 5

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.

More Digiduct apps to explore

4
Duct Mate: HVAC Duct Sizer
Duct Mate: HVAC Duct Sizer
Duct Mate: HVAC Duct Sizer
Duct Sizing & Airflow Calc
Free
🔧 Utilities
(0)
5
DuctSizer Pro
DuctSizer Pro
DuctSizer Pro
by LEONARDO NOVOA
Free

This tool quickly calculates HVAC duct sizes based on airflow and friction loss. It supports various duct shapes and provides key airflow values for field use.

Calculate CFM from duct sizeFind duct sizes from CFMSupports square, round, and oval duct
🔧 Utilities
(2)
free
6
SimpleVenti
SimpleVenti
SimpleVenti
Easily calculate ventilation
Free
💼 Business
(0)
7
DuctSizeCalc
DuctSizeCalc
DuctSizeCalc
by Technical Data Service Co.,Ltd.
$2.99

Easily calculate duct sizes for air conditioning systems using the constant-pressure method. Input wind volume and tap calculate to determine duct dimensions, pressure, and wind velocity. Useful for blueprints, working drawings, and on-site applications.

Constant-pressure method duct sizingInput wind volume for calculationSupports rectangular and circular ducts
📊 Productivity
(1)
paid
8
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
9
DuctPro: Duct Size Calculator
DuctPro: Duct Size Calculator
DuctPro: Duct Size Calculator
Duct Sizer & Static Pressure
Free
🔧 Utilities
(0)
10
Ductalator
Ductalator
Ductalator
HVAC Duct Sizing Calculator
Free
📊 Productivity
(0)
11
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
12
Climcalc Dimensión
Climcalc Dimensión
Climcalc Dimensión
by Saint-Gobain
Free
💼 Business
(0)
13
ChekDuct
ChekDuct
ChekDuct
by Mohamed Kharbat
Free
🔧 Utilities
(0)
14
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
15
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
16
HVAC Duct Tools Manual D
HVAC Duct Tools Manual D
HVAC Duct Tools Manual D
Ductulator & static pressure
Free

This utility app provides HVAC professionals with tools for duct sizing and field checks based on ACCA Manual D methods. It offers quick calculations for duct size, friction rate, velocity, and static pressure, all while prioritizing user privacy and offline functionality.

Quick duct sizing (round/rectangular)Duct friction rate and velocity checksStatic pressure calculations
🔧 Utilities
(1)
free
17
HVACSize
HVACSize
HVACSize
Manual J Load Calculator
Free
🔧 Utilities
(0)
18
CookTools
CookTools
CookTools
by Loren Cook Company
Free
📊 Productivity
(0)
19
Duct Calc — HVAC Duct Sizer
Duct Calc — HVAC Duct Sizer
Duct Calc — HVAC Duct Sizer
Round, rect & flex duct sizing
Free
📊 Productivity
(0)
20
DuctSizer: Duct Calculator
DuctSizer: Duct Calculator
DuctSizer: Duct Calculator
HVAC sizing: friction & CFM
Free
🔧 Utilities
(0)

FAQ about Digiduct

What are the best digiduct apps for iPhone?
Digiduct tops our digiduct apps ranking as of August 2026, with a 4.6-star average from 11 App Store ratings, and it's free to download.
Yes — 18 of the top digiduct apps we rank are free to download, including Digiduct and DuctPro.
Digiduct shows ads and has no in-app purchases, according to its App Store listing as of August 2026.
We track 250+ digiduct apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
Digiduct is a utility app designed for HVAC professionals to perform accurate duct sizing calculations. It utilizes equations and recommendations from the ASHRAE Fundamentals – Duct Design chapter to ensure reliable results.
Digiduct supports sizing for rectangular, round, and flat oval ducts, providing flexibility for various duct designs.