# Smart Invoice vs 链冶材

The clearest difference is in-app purchases: 链冶材 at none against Smart Invoice's 2. 链冶材 also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Smart Invoice sells 2 in-app purchases, starting at $6.99 per 7 days. 链冶材 asks for nothing beyond the download.

Smart Invoice ships an update every 3 months, 链冶材 every 3 weeks. The most recent releases landed on October 4, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Smart Invoice | 链冶材 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 63 MB | 46 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CW Lee](https://appshunter.io/developer/1468639016) | [唐山银耐联电子商务有限公司](https://appshunter.io/developer/1381056002) |

## What reviewers say

### Smart Invoice

[App page](https://appshunter.io/ios/app/smart-invoice/id1516600182)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $6.99 | per 7 days |
| Annually Subscription | $69.99 | per year |


### 链冶材

[App page](https://appshunter.io/ios/app/id6444025345)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Smart Invoice free?

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

### Is 链冶材 free?

链冶材 is free to download, with no in-app purchases.

### Do Smart Invoice or 链冶材 have ads?

Smart Invoice shows ads; 链冶材 does not.

### Which is updated more often, Smart Invoice or 链冶材?

Smart Invoice ships an update every 3 months, and 链冶材 every 3 weeks. Most recently, Smart Invoice was updated on October 4, 2026 and 链冶材 on October 12, 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.*