# Smart Diffuser vs BT

The clearest difference is rating: Smart Diffuser at 2.7 against BT's 1.6. Smart Diffuser also leads on update cadence (every 6 weeks vs every 3 months). BT's advantage is review sentiment (50% vs 25%) and iOS requirement (9.0 vs 12.0). On price, ratings volume, 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.

Smart Diffuser holds the better App Store score, 2.7 against 1.6. Both are backed by a comparable volume of ratings — 6 and 8 respectively. Written reviews complicate that: 25% of Smart Diffuser's written reviews are positive against 50% of BT's, so the app with the better star average is not the one people write more warmly about.

Smart Diffuser ships an update every 6 weeks, BT every 3 months. The most recent releases landed on July 7, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Smart Diffuser | BT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (6 ratings)](https://appshunter.io/ios/app/smart-diffuser/id1436466932/reviews)** | [1.6 (8 ratings)](https://appshunter.io/ios/app/bt-aroma/id1601150083/reviews) |
| Number of ratings | 6 | **8** |
| Positive reviews | 25.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | Free | Free |
| Size | 42 MB | 3 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [秦庚 蒋](https://appshunter.io/developer/1436462643) | [俊 谢](https://appshunter.io/developer/1440271932) |

## What reviewers say

### Smart Diffuser

[App page](https://appshunter.io/ios/app/smart-diffuser/id1436466932)

Control your smart scent machine remotely via Wi-Fi. Adjust scent intensity, monitor oil levels, and manage multiple devices. Authorize other users and group machines for business use.

**Highlights:** Remote Wi-Fi control, Scent intensity adjustment, Oil level monitoring, User authorization, Device grouping, Employee account management

**In-app purchases:** none


### BT

[App page](https://appshunter.io/ios/app/bt-aroma/id1601150083)

This utility app allows users to customize working periods for a machine. It supports setting different working days and times for various requests and locations, offering flexibility in machine operation.

**Highlights:** Customizable working modes, Set 5 groups of working periods, Define different working days, Schedule specific working times, Adaptable to various requests and locations

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Smart Diffuser free?

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

### Is BT free?

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

### Which has better reviews, Smart Diffuser or BT?

Smart Diffuser is rated higher. Smart Diffuser averages 2.7 out of 5 from 6 ratings, while BT averages 1.6 from 8 ratings.

### Do Smart Diffuser or BT have ads?

Neither Smart Diffuser nor BT shows ads.

### Which is updated more often, Smart Diffuser or BT?

Smart Diffuser ships an update every 6 weeks, and BT every 3 months. Most recently, Smart Diffuser was updated on July 7, 2026 and BT on June 11, 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.*