# J vs labX

The clearest difference is update cadence: labX at every 3 days against J's every 2 months. J's advantage is iOS requirement (13.4 vs 18.2). 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 2 months, labX every 3 days. The most recent releases landed on September 17, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | J | labX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Size | 25 MB | 19 MB |
| Requires iOS | **13.4** | 18.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Informatics Publishing Limited](https://appshunter.io/developer/1490108702) | [School of Science and Technology, Singapore](https://appshunter.io/developer/649690368) |

## What reviewers say

### J

[App page](https://appshunter.io/ios/app/j-gate/id1670549103)

**In-app purchases:** none


### labX

[App page](https://appshunter.io/ios/app/labx/id6749056493)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is J free?

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

### Is labX free?

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

### Do J or labX have ads?

Neither J nor labX shows ads.

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

J ships an update every 2 months, and labX every 3 days. Most recently, J was updated on September 17, 2026 and labX on September 7, 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.*