# Quoc Duy App vs ElbowCalc

The clearest difference is in-app purchases: Quoc Duy App at none against ElbowCalc's 1. Quoc Duy App also leads on update cadence (monthly vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ElbowCalc sells 1 one-off in-app purchase. Quoc Duy App asks for nothing beyond the download.

Quoc Duy App ships an update monthly, ElbowCalc every 6 months. The most recent releases landed on October 27, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Quoc Duy App | ElbowCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (7 ratings)](https://appshunter.io/ios/app/elbowcalc-flat-pattern-maker/id6753796014/reviews)** |
| Number of ratings | — | **7** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 months |
| Monetization | — | Free with in-app purchases |
| Size | 88 MB | 37 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Citek Technology JSC](https://appshunter.io/developer/1471100432) | [Sachinbhai Surani](https://appshunter.io/developer/1838685550) |

## What reviewers say

### Quoc Duy App

[App page](https://appshunter.io/ios/app/quoc-duy-app/id1578545801)

**Features:** macOS Compatibility

**In-app purchases:** none


### ElbowCalc

[App page](https://appshunter.io/ios/app/elbowcalc-flat-pattern-maker/id6753796014)

This professional tool assists engineers and fabricators in quickly calculating and visualizing flat patterns for elbows and reducers. It provides instant pattern graphs with cut coordinates to streamline fabrication and minimize material waste.

**Highlights:** Calculate various elbow types, Generate flat pattern graphs, Supports reducer bends, Provides cut coordinates, Fast and precise calculations, Share and save results

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $19.99 | one-time |


## Frequently asked questions

### Is Quoc Duy App free?

Quoc Duy App is free to download, with no in-app purchases.

### Is ElbowCalc free?

ElbowCalc is free to download, with in-app purchases available.

### Do Quoc Duy App or ElbowCalc have ads?

Neither Quoc Duy App nor ElbowCalc shows ads.

### Which is updated more often, Quoc Duy App or ElbowCalc?

Quoc Duy App ships an update monthly, and ElbowCalc every 6 months. Most recently, Quoc Duy App was updated on October 27, 2026 and ElbowCalc on October 26, 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.*