# J vs RG樓擂健身

The clearest difference is update cadence: J at every 3 months against RG樓擂健身's every 19 months. J also leads on iOS requirement (13.0 vs 15.0). 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, RG樓擂健身 every 19 months. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | J | RG樓擂健身 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 19 months |
| Size | 81 MB | 49 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [weichieh lin](https://appshunter.io/developer/1683777188) | [Eternal W Technology Co., Ltd.](https://appshunter.io/developer/1485685478) |

## What reviewers say

### J

[App page](https://appshunter.io/ios/app/j-lin-infinity/id1643486063)

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

**In-app purchases:** none


### RG樓擂健身

[App page](https://appshunter.io/ios/app/rg/id6449640653)

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

**In-app purchases:** none


## Frequently asked questions

### Is J free?

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

### Is RG樓擂健身 free?

RG樓擂健身 is free to download, with no in-app purchases.

### Do J or RG樓擂健身 have ads?

Neither J nor RG樓擂健身 shows ads.

### Which is updated more often, J or RG樓擂健身?

J ships an update every 3 months, and RG樓擂健身 every 19 months. Most recently, J was updated on September 17, 2026 and RG樓擂健身 on September 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*