# A vs J

The clearest difference is update cadence: A at every 5 days against J's every 2 weeks. J's advantage is iOS requirement (17.0 vs 26.4). 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.

A ships an update every 5 days, J every 2 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | A | J |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Size | 13 MB | 3 MB |
| Requires iOS | 26.4 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mitsuhiko Fuda](https://appshunter.io/developer/1846787380) | [Akinori Kanazawa](https://appshunter.io/developer/1876560461) |

## What reviewers say

### A

[App page](https://appshunter.io/ios/app/a-motioncap/id6780172137)

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

**In-app purchases:** none


### J

[App page](https://appshunter.io/ios/app/j-kinetics/id6782524300)

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

**In-app purchases:** none


## Frequently asked questions

### Is A free?

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

### Is J free?

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

### Do A or J have ads?

Neither A nor J shows ads.

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

A ships an update every 5 days, and J every 2 weeks. Most recently, A was updated on October 31, 2026 and J on October 31, 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.*