# Flat Pattern Bend Calculator vs DuctCalc.Ca

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.

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.

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.

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.

## The numbers

| Metric | Flat Pattern Bend Calculator | DuctCalc.Ca |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (151 ratings)](https://appshunter.io/ios/app/flat-pattern-bend-calculator/id1361485922/reviews)** | [1.9 (20 ratings)](https://appshunter.io/ios/app/ductcalcca/id1434460375/reviews) |
| Number of ratings | **151** | 20 |
| Positive reviews | 46.9% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 61 MB | 9 MB |
| Requires iOS | 15.0 | **11.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bhavinkumar Satashiya](https://appshunter.io/developer/1361485921) | [Firas Kneifati](https://appshunter.io/developer/1434460374) |

## What reviewers say

### Flat Pattern Bend Calculator

[App page](https://appshunter.io/ios/app/flat-pattern-bend-calculator/id1361485922)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $4.99 | per 7 days |
| MONTHLY UNLOCK | $6.99 | per month |
| Offer : Yearly Access | $29.99 | per year |
| Yearly Access | $39.99 | per year |
| YEARLY UNLOCK | $39.99 | per year |
| LIFETIME UNLOCK | $69.99 | one-time |


### DuctCalc.Ca

[App page](https://appshunter.io/ios/app/ductcalcca/id1434460375)

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:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Full Air Flow | $6.99 | one-time |
| Three Months Full Air Flow | $17.99 | one-time |
| Six Months Full Air Flow | $29.99 | one-time |
| One Year Full Air Flow | $49.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*