# J vs WeldZip

The clearest difference is update cadence: J at every 3 months against WeldZip's every 8 months. WeldZip's advantage is iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

J ships an update every 3 months, WeldZip every 8 months. The most recent releases landed on August 29, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | J | WeldZip |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 8 months |
| Size | 30 MB | 85 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [深圳市佳士科技股份有限公司](https://appshunter.io/developer/1494882581) | [Shanghai KongDe IT Co., LTD.](https://appshunter.io/developer/1235370082) |

## What reviewers say

### J

[App page](https://appshunter.io/ios/app/j-weld/id6469101974)

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

**In-app purchases:** none


### WeldZip

[App page](https://appshunter.io/ios/app/weldzip/id6739935720)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is J free?

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

### Is WeldZip free?

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

### Do J or WeldZip have ads?

Neither J nor WeldZip shows ads.

### Which is updated more often, J or WeldZip?

J ships an update every 3 months, and WeldZip every 8 months. Most recently, J was updated on August 29, 2026 and WeldZip on September 9, 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.*