# b vs Smart Charge HK

b and Smart Charge HK are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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, Smart Charge HK every 9 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | b | Smart Charge HK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 9 months** |
| Monetization | Free | — |
| Size | 53 MB | 60 MB |
| Requires iOS | **10.0** | 11.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [RHT INDUSTRIES LIMITED](https://appshunter.io/developer/1494989445) | [Smart Charge (HK) Limited](https://appshunter.io/developer/1191747508) |

## What reviewers say

### b

[App page](https://appshunter.io/ios/app/b-mola/id1494989446)

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.

**Highlights:** Connect/disconnect mobile device, Switch air purifier on/off, Control turbo power, Set automatic timer, Remote monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart Charge HK

[App page](https://appshunter.io/ios/app/smart-charge-hk/id1567190640)

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

**In-app purchases:** none


## Frequently asked questions

### Is b free?

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

### Is Smart Charge HK free?

Smart Charge HK is free to download, with no in-app purchases.

### Do b or Smart Charge HK have ads?

Neither b nor Smart Charge HK shows ads.

### Which is updated more often, b or Smart Charge HK?

b ships an update every 16 months, and Smart Charge HK every 9 months. Most recently, b was updated on October 24, 2026 and Smart Charge HK on October 25, 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.*