# Asuka Air Master vs RETHLock

The clearest difference is update cadence: RETHLock at fortnightly against Asuka Air Master's every 3 months. 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.

Asuka Air Master ships an update every 3 months, RETHLock fortnightly. The most recent releases landed on October 25, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Asuka Air Master | RETHLock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 31 MB | 59 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ASUKA AUTOTRONICS INC](https://appshunter.io/developer/1162051369) | [UEIHAUR ENTERPRISE CO.,LTD](https://appshunter.io/developer/1692135449) |

## What reviewers say

### Asuka Air Master

[App page](https://appshunter.io/ios/app/asuka-air-master/id1613902642)

**Features:** macOS Compatibility

**In-app purchases:** none


### RETHLock

[App page](https://appshunter.io/ios/app/rethlock/id6450167757)

**In-app purchases:** none


## Frequently asked questions

### Is Asuka Air Master free?

Asuka Air Master is free to download, with no in-app purchases.

### Is RETHLock free?

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

### Do Asuka Air Master or RETHLock have ads?

Neither Asuka Air Master nor RETHLock shows ads.

### Which is updated more often, Asuka Air Master or RETHLock?

Asuka Air Master ships an update every 3 months, and RETHLock fortnightly. Most recently, Asuka Air Master was updated on October 25, 2026 and RETHLock on October 8, 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.*