# J vs WeldSet

The clearest difference is in-app purchases: J at none against WeldSet's 1. J also leads on iOS requirement (15.6 vs 17.0). WeldSet's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. WeldSet sells 1 one-off in-app purchase. J asks for nothing beyond the download.

J ships an update every 3 months, WeldSet every 2 weeks. The most recent releases landed on October 14, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | J | WeldSet |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 30 MB | 4 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [深圳市佳士科技股份有限公司](https://appshunter.io/developer/1494882581) | [PLAYRIOT LLC](https://appshunter.io/developer/1875195414) |

## What reviewers say

### J

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

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

**In-app purchases:** none


### WeldSet

[App page](https://appshunter.io/ios/app/weldset-welding-calculator/id6781484700)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WeldSet Unlock | $9.99 | one-time |


## Frequently asked questions

### Is J free?

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

### Is WeldSet free?

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

### Do J or WeldSet have ads?

Neither J nor WeldSet shows ads.

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

J ships an update every 3 months, and WeldSet every 2 weeks. Most recently, J was updated on October 14, 2026 and WeldSet on October 25, 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.*