# 钢易通 vs Unbend Flat Pattern Calculator

The clearest difference is in-app purchases: 钢易通 at none against Unbend Flat Pattern Calculator's 1. 钢易通 also leads on ads (none vs shown) and iOS requirement (9.0 vs 16.4). On price, update cadence and device support there is nothing between them.

Both are free to download. Unbend Flat Pattern Calculator sells 1 one-off in-app purchase. 钢易通 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 26, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | 钢易通 | Unbend Flat Pattern Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | Fortnightly |
| Size | 110 MB | 60 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [杭州钢易科技有限公司](https://appshunter.io/developer/1421677617) | [Omer Faruk BAGCI](https://appshunter.io/developer/1850264269) |

## What reviewers say

### 钢易通

[App page](https://appshunter.io/ios/app/id1421677618)

**Features:** macOS Compatibility

**In-app purchases:** none


### Unbend Flat Pattern Calculator

[App page](https://appshunter.io/ios/app/unbend-flat-pattern-calculator/id6797460542)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unbend Pro Unlock | $14.99 | one-time |


## Frequently asked questions

### Is 钢易通 free?

钢易通 is free to download, with no in-app purchases.

### Is Unbend Flat Pattern Calculator free?

Unbend Flat Pattern Calculator is free to download, with in-app purchases available.

### Do 钢易通 or Unbend Flat Pattern Calculator have ads?

Unbend Flat Pattern Calculator shows ads; 钢易通 does not.

### Which is updated more often, 钢易通 or Unbend Flat Pattern Calculator?

钢易通 ships an update fortnightly, and Unbend Flat Pattern Calculator fortnightly. Most recently, 钢易通 was updated on October 26, 2026 and Unbend Flat Pattern Calculator on October 19, 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.*