Comparison

Asuka Air Master vs RETHLock

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

About

Asuka Air Master

Features

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The app is designed to work with Asuka KP-100BT/AirMaster dongle, an Air Quality Monitor device that provides you: (1) Realtime monitoring of CO2 concentration, and (2) Historical data of air quality measurements up to 7 days (3) Instant warning alert from your mobile device if a hazardous environment were detected. Keeping the air fresh is essential to personal health and comfort. It is wise to use and stay connected with ASUKA's Air Master, and be free from the invisible threat to your health!

About

RETHLock

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• Supports access to RETH locks. • Check operated records from locks. • Authorized users to open the door at any time and everywhere. • Locks suitable for apts, house, office..ect. • Requirements: IPHONE with IOS 13 or higher. BLUETOOTH Please let us know if you meet any problem while using this APP. Email: reth.twni@msa.hinet.net For additional information, please visit: https://www.rethlock.com.tw

Screenshots

Asuka Air Master4 screens

RETHLock4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard1 real difference · 5 level

Asuka Air Master versus RETHLock: the parameters behind the verdict, then further details
Parameter	Asuka Air Master	RETHLock
Price	Free	Free
Update frequency	Every 3 months	Fortnightly — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPod	iPhone, iPod
Requires iOS	12.0 — better	13.0
Further details — not scored
Size	31 MB	59 MB
Age rating	4+	4+
Developer	ASUKA AUTOTRONICS INC	UEIHAUR ENTERPRISE CO.,LTD

In-app purchases

None

Asuka Air Master

No in-app purchases

None

RETHLock

No in-app purchases

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.