Comparison

Flat Pattern Bend Calculator vs DuctCalc.Ca

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Flat Pattern Bend Calculator

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.

Highlights
  • Cone calculations
  • Frustum calculations
  • Truncated cylinder layouts
  • Bend allowance calculations
  • Transition piece generation
  • Complex shape patterns
Features
Read full description

Unlock the power of advanced sheet metal calculations right at your fingertips. Flat Pattern Bend Calculator is a comprehensive tool designed for engineers, fabricators, and designers who need quick and accurate flat pattern layouts for a variety of complex shapes and transitions. This app simplifies complex metal sheet calculations, enabling users to accurately calculate flat pattern bends for various shapes and structures ► Key Features: Cone Calculations: Easily generate flat patterns for conical shapes. Frustum Eccentric (Parallel & Angle): Compute flat patterns for both parallel and angled eccentric frustums with precision. Truncated Cylinder: Obtain accurate layouts for truncated cylindrical shapes. Bend Allowance Calculations: Calculate bend allowances and deductions for various angles to ensure perfect bends every time. ► Transition Pieces: Rectangle to Circle: Seamlessly transition between rectangular and circular shapes. Rectangle to Circle Eccentric: Handle off-center transitions with ease. Circle to Rectangle: Convert circular shapes to rectangular patterns effortlessly. Rectangle to Rectangle: Calculate flat patterns for rectangular transitions. Complex Shapes: Pants & Pants Eccentric: Design complex bifurcated ducts and fittings. Breeches: Create layouts for Y-shaped connections. Tees: Generate patterns for T-shaped junctions. Pyramid: Calculate flat patterns for pyramid-shaped objects. Auger: Design helical screw patterns with precision. Sphere: Compute flat layouts for spherical shapes. Flange: Generate accurate flange patterns for pipe fittings. Why Choose Our App? • Efficiency: Reduce manual calculations and save valuable time on your projects. • Accuracy: Minimize errors with precise computations tailored to your specific needs. • User-Friendly Interface: Intuitive design makes complex calculations accessible to everyone. • Versatility: Ideal for HVAC ductwork, industrial piping, metal roofing, and custom fabrication projects. • Instant Results: Get immediate calculations to accelerate your workflow. Who Can Benefit? • Sheet Metal Fabricators • Mechanical Engineers • HVAC Professionals • Metalworkers and Welders • Industrial Designers • Students and Educators in Engineering Fields Take Your Fabrication Projects to the Next Level! Say goodbye to cumbersome manual calculations and hello to streamlined efficiency. Download the Sheet Metal Flat Pattern Calculator now and experience the future of metal fabrication. Download Today and Start Shaping Your Success! Privacy Policy : https://forms.gle/dnBUgnpqw4AREio97 Terms of Use : https://forms.gle/2uy2JqJa2JjkTZpo8

About

DuctCalc.Ca

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.

Highlights
  • Duct sizing calculator
  • Equal Friction Method
  • Velocity Method
  • Round and rectangular duct support
  • Offline functionality
  • Full air flow range activation
Features
Read full description

DuctCalc.Ca is the iOS offline version of the most popular online ductulator app (ductcalc.ca) Enjoy using the app with no internet connection when subscribed! App engineering explanation: ------------------------------ Equal Friction Method: Using a predefined static pressure loss per unit of duct length, DuctCalc.Ca Ductulator App calculates the diameter of round duct and the other dimension of rectangular duct. Based on the calculated dimensions, the air velocity will be calculated for both duct shapes and dimensions. Velocity Method: Using a predefined air velocity, DuctCalc.Ca Ductulator App calculates the diameter of round duct and the other dimension of a rectangular duct. Based on the calculated dimensions, the static pressure loss will be calculated for both duct shapes and dimensions. Note that unlike conventional ductulators, this ductulator will calculate the dimensions of the rectangular duct based on the given velocity and it then calculates the static pressure loss for the rectangular duct based on the given velocity and dimensions. Most old calculators will only use the given velocity to calculate the diameter of the round duct then it calculates the static pressure loss for the round duct and uses that static pressure to calculate the rectangular duct dimensions which is not the case here for more precise velocity output. Colebrook equation is used to solve for Darcy's friction factor and calculates the static pressure loss in the duct until it matches the desired input at defined airflow and absolute roughness of the inner material of the duct touching the moving air. In-App Purchases: ------------------- • With no subscription the app will calculate for an air flow range between (950 and 1100 [cfm]). To activate full air flow functionality. There are four subscription options: one month, three months, six months and one year. • All subscription options will activate the "Full Air Flow Functionality" of the duct sizing app for that specific subscription period. The full air flow range is (1 to 500,000 [CFM] or 1 to 235,974 [L/s] in metric units). • Payment will be charged to iTunes Account at confirmation of purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://ductcalc.ca/?page=agreement Terms of Service: https://ductcalc.ca/?page=agreement

Screenshots

Flat Pattern Bend Calculator4 screens
DuctCalc.Ca1 screens

Verdict

The call

The clearest difference is rating: Flat Pattern Bend Calculator at 4.6 against DuctCalc.Ca's 1.9. Flat Pattern Bend Calculator also leads on update cadence (every 2 months vs every 4 months) and ratings volume (151 vs 20). DuctCalc.Ca's advantage is ads (none vs shown) and iOS requirement (11.3 vs 15.0). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flat Pattern Bend Calculator sells 6 in-app purchases, starting at $4.99 per 7 days and DuctCalc.Ca sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Flat Pattern Bend Calculator holds the better App Store score, 4.6 against 1.9. That said, the two scores are not equally well evidenced: Flat Pattern Bend Calculator has 151 ratings behind it against 20, so its average is the more settled of the two. Written reviews complicate that: 47% of Flat Pattern Bend Calculator's written reviews are positive against 50% of DuctCalc.Ca's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Flat Pattern Bend Calculator ships an update every 2 months, DuctCalc.Ca every 4 months. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.

Scorecard5 real differences · 5 level
Flat Pattern Bend Calculator versus DuctCalc.Ca: the parameters behind the verdict, then further details
ParameterFlat Pattern Bend CalculatorDuctCalc.Ca
PriceFreeFree
Rating4.6 (151 ratings) — better1.9 (20 ratings)
Positive reviews46.9% of reviews50.0% of reviews — better
Number of ratings151 — better20
Update frequencyEvery 2 months — betterEvery 4 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.011.3 — better
Further details — not scored
Size61 MB9 MB
Age rating4+4+
DeveloperBhavinkumar SatashiyaFiras Kneifati

Customer experience

Flat Pattern Bend Calculator

All ratings151 ratings
Positive90.1%
Neutral1.3%
Negative8.6%
Written reviews32 reviews
Positive46.9%
Neutral6.3%
Negative46.9%

DuctCalc.Ca

All ratings20 ratings
Positive20.0%
Neutral5.0%
Negative75.0%
Written reviews14 reviews
Positive50.0%
Neutral7.1%
Negative42.9%

In-app purchases

6 purchases

Flat Pattern Bend Calculator

Subscriptions5
  • Weekly Subscription$4.997 Days
  • MONTHLY UNLOCK$6.991 Month
  • Offer : Yearly Access$29.991 Year
Show 2 more
  • Yearly Access$39.991 Year
  • YEARLY UNLOCK$39.991 Year
One-time1
  • LIFETIME UNLOCK$69.99
4 purchases

DuctCalc.Ca

One-time4
  • One Month Full Air Flow$6.99
  • Three Months Full Air Flow$17.99
  • Six Months Full Air Flow$29.99
Show 1 more
  • One Year Full Air Flow$49.99

Questions

Is Flat Pattern Bend Calculator free?
Flat Pattern Bend Calculator is free to download, with in-app purchases available.
Is DuctCalc.Ca free?
DuctCalc.Ca is free to download, with in-app purchases available.
Which has better reviews, Flat Pattern Bend Calculator or DuctCalc.Ca?
Flat Pattern Bend Calculator is rated higher. Flat Pattern Bend Calculator averages 4.6 out of 5 from 151 ratings, while DuctCalc.Ca averages 1.9 from 20 ratings.
Do Flat Pattern Bend Calculator or DuctCalc.Ca have ads?
Flat Pattern Bend Calculator shows ads; DuctCalc.Ca does not.
Which is updated more often, Flat Pattern Bend Calculator or DuctCalc.Ca?
Flat Pattern Bend Calculator ships an update every 2 months, and DuctCalc.Ca every 4 months. Most recently, Flat Pattern Bend Calculator was updated on September 29, 2026 and DuctCalc.Ca on October 1, 2026.

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