Ductulator - Duct Sizing

Name: Ductulator - Duct Sizing
Price: 3.99 USD
Rating: 4.7 (297 reviews)
Author: Wassim Murr

By: Wassim Murr

HVAC Duct Design Calculator

Features & Capabilities

Ductulator is a fast HVAC duct sizing calculator that saves time on duct design. Size ducts instantly based on friction rate or velocity and get multiple valid dimensions in seconds. It supports rectangular, circular, and flexible ducts and updates friction and velocity automatically. IP and SI unit support.

Details mode lets you tweak duct dimensions and airflow to fit your project, while you can toggle between calculation methods and review several options at once. Ideal for engineers and HVAC professionals who want quick, reliable duct sizing without charts.

User Growth & Download Statistics

App Design Education Developer Tools Energy

By:

Wassim Murr

Rating:

4.70

(297) 4 new ratings

Version:

3.5 Last updated: 2026-03-24

Version code:

883630467

Creation date:

2019-08-13

Compatible devices:

Size:

1.18MB

Price:

3.99

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 96,907 ▲ 559

Other rankings

#72 in size keyword 12 ▲

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Wassim Murr

Apple Apps Store

https://apps.apple.com/us/app/ductulator-duct-sizing/id1474939475

User Reviews

Overall, users praise the app for field usability and practical sizing options, and its ability to replace older tools. However, repeated drawbacks include limited/customizable duct sizes, problematic or missing Flex features, update-related regressions, missing duct shapes (oval, round/square), and size-related calculation constraints. A few users also noted unexpected billing charges. The app remains useful but has clear feature gaps and update concerns.

Pros

Very easy to use in the field; users report it's easy to operate and handy for measuring duct runs.
Offers multiple sizing options for ducts (CFM, velocity) and different duct configurations.
Handy for measuring and sizing duct runs in real-world field work.
Useful tool that can replace older duct sizing tools like the traditional Ductulator.

Cons

Inability to input custom duct sizes and limited size options; non-sequential size steps (e.g., jumps like 24 to 26).
Flex option issues: the new flex option isn’t working properly or isn’t selectable in calculations.
Update regressions: some users feel the newer version regressed functionality and should revert.
Missing flat oval duct support and limited duct shapes; users want round/square options as well.
Size limitations hinder precise calculations (friction rate/CFM) and make some common sizes hard to analyze.

Recent reviews

Update- I got your email. I understand the way you have the app set up I just didn’t understand it before I bought the app. The function of your app is pretty much pointless for anything I need it for. If I want to size a traditional residential HVAC duct system this does not help. Your app mostly seems to be used to figure out numbers just for fun. Who cares what the velocity of 500 CFM going through 6 inch flex? You can’t get 500 CFM through 6 inch flex anyway so why would you want to know that number? End Update. You need to be able to pick 6 inch flex and then the app tell you how many CFM can go through that. The way this is set up now is just silly. I like the idea you can get velocity, but you need to know how many CFM goes through all the different sizes. Now I have to buy another app.

by Br*****, 2025-08-11

I downloaded the app for free then was charged recently for $4.26 when I never signed up for a subscription or anything. The app is a scam I guess ?

by Ch*****, 2025-06-01

The only thing holding the app back IMO is the omission of flat oval ducts. They’re uncommon, but it’s the only thing the app can’t do that has caused me to have to reach for the less convenient methods.