b vs DOUBLE COAST
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
b
Control and monitor your smart air purifiers remotely. Manage power, set timers, and adjust fan speed for optimal indoor air quality. Requires compatible device connection.
- Connect/disconnect mobile device
- Switch air purifier on/off
- Control turbo power
- Set automatic timer
- Remote monitoring
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RHT Industries Limited is a company that specializes in air purification technology. It invented the NCCO Air Purification Technology with the Member of HKUST Entrepreneurship Program and holds the patent. Over the years, RHT Industries Limited has formulated IAQ (Indoor Air Quality) together with Hong Kong Environmental Protection Department and still in use today, has offered a professional and efficient advisory service of air purification and air treatment for Hong Kong Hospital Authority, Hong Kong Housing Authority, Hong Kong International Airport, DoubleTree by Hilton, HSBC, Philips, Oregon Scientific, Poly Group and other organizations and firms. The b-MOLA application connects BM50, BM100, BM150 and BM300 to your mobile device. It manages and monitors features of the devices listed above. Use the b-MOLA application to set ip and manage the following. Features: - Connect to and disconnect from a mobile device - Switch on and off the air purifier - Control the turbo power of the air purifier - Set a timer for the air purifier to switch on and off automatically * Settings and features provided by the b-MOLA application are only available when BM50, BM100, BM150, BM300 is/are connected to your mobile device. Features will not work properly without a proper connection between BM50/ BM100/ BM150/ BM300 and your mobile device. * This application is only for BM50, BM100, BM150 and BM300. * For any questions, please contact us via the web page below. (https://www.bmola.hk/faq)
DOUBLE COAST
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Taking inspirations from Sydney's waterfront, Double Coast captures natural, dynamic curvy waves into waterscape installations and panoramic visual landscape designs throughout the project from clubhouse, lobby and interior design, introducing the vibe of Sydney's seaside at the doorstep. Whether it's the urban gist of Sydney's waterfront, or the exquisite greenery in Hong Kong, you can embrace both in one coast. CLUB SYDNEY, the residents’ club of DOUBLE COAST I, emerging with the essence of Sydney’s coastal charm, it covers with a space over 79,000 sq. ft. along with a landscape inspired by the Royal Botanic Garden Sydney and implanting the iconic Jacaranda trees of Australia. Dive into the approximately 50m waterfront¹ swimming pool, it is next to an indoor heated pool, offering a new aquatic fitness experience with FloatFit HIIT. The club features an impressive Wellness Centre spanning over 8,400 sq. ft., including a 24-hour gym with garden and inner harbour view, it offers a variety of fitness gear, brand new interactive rowing machines and surfing machines; it also provides a Yoga Studio, luxurious spa with private Jacuzzi and steam sauna room, providing a complete sanctuary for body and soul. Villa Utzon, is tailored for triple themes of wine tasting, entertainment, and banquets, featuring comprehensive cooking facilities, as well as a private Jacuzzi, garden, and BBQ equipment, allowing residents to enjoy the fun of cooking and throws the parties and celebrations at any time.
Screenshots
Verdict
The clearest difference is iOS requirement: b at 10.0 against DOUBLE COAST's 16.4. On price, update cadence, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
b ships an update every 16 months, DOUBLE COAST every 10 months. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.
| Parameter | b | DOUBLE COAST |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Every 16 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 53 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | RHT INDUSTRIES LIMITED | Innowave Solutions Limited |
In-app purchases
b
No in-app purchases
DOUBLE COAST
No in-app purchases









