# b vs DOUBLE COAST

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.

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.

## The numbers

| Metric | b | DOUBLE COAST |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 10 months** |
| Monetization | Free | — |
| Size | 53 MB | 68 MB |
| Requires iOS | **10.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RHT INDUSTRIES LIMITED](https://appshunter.io/developer/1494989445) | [Innowave Solutions Limited](https://appshunter.io/developer/1560929775) |

## 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


### DOUBLE COAST

[App page](https://appshunter.io/ios/app/double-coast/id6737324536)

**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 DOUBLE COAST free?

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

### Do b or DOUBLE COAST have ads?

Neither b nor DOUBLE COAST shows ads.

### Which is updated more often, b or DOUBLE COAST?

b ships an update every 16 months, and DOUBLE COAST every 10 months. Most recently, b was updated on October 10, 2026 and DOUBLE COAST on October 14, 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.*