# Smart Diffuser vs Scan QR Code & Barcode

The clearest difference is rating: Smart Diffuser at 5.0 against Scan QR Code & Barcode's 4.2. Smart Diffuser also leads on in-app purchases (none vs 2) and ads (none vs shown). Scan QR Code & Barcode's advantage is update cadence (every 3 weeks vs every 5 months) and ratings volume (36 vs 3). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Scan QR Code & Barcode sells 2 in-app purchases, starting at $19.99 per 7 days. Smart Diffuser asks for nothing beyond the download.

Smart Diffuser holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Scan QR Code & Barcode has 36 ratings behind it against 3, so its average is the more settled of the two.

Smart Diffuser ships an update every 5 months, Scan QR Code & Barcode every 3 weeks. Both last shipped on September 18, 2026.

## The numbers

| Metric | Smart Diffuser | Scan QR Code & Barcode |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/smart-diffuser/id6502768383/reviews)** | [4.2 (36 ratings)](https://appshunter.io/ios/app/scan-qr-code-and-barcode/id6702016142/reviews) |
| Number of ratings | 3 | **36** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 16 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Shenzhen Shengmu Technology Co., Ltd.](https://appshunter.io/developer/1746717166) | [艳 王](https://appshunter.io/developer/1763352243) |

## What reviewers say

### Smart Diffuser

[App page](https://appshunter.io/ios/app/smart-diffuser/id6502768383)

Control your aroma diffuser remotely via Bluetooth. Adjust power, lighting, intensity, and set custom schedules. Reset your device directly from your phone.

**Highlights:** Bluetooth connectivity, Power control, Atmosphere light adjustment, Intensity settings, Schedule setup, Device reset

**Features:** macOS Compatibility

**In-app purchases:** none


### Scan QR Code & Barcode

[App page](https://appshunter.io/ios/app/scan-qr-code-and-barcode/id6702016142)

Quickly scan QR codes and barcodes to access information. Generate and share your own codes, and keep an archive of all scanned and created codes. Supports auto-scan functionality for efficient use.

**Highlights:** QR Code Scanner, Create QR Codes, Barcode Scanner, Share QR Codes, Auto Scan, Code Archive

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| week | $19.99 | per 7 days |
| month | $29.99 | per month |


## Frequently asked questions

### Is Smart Diffuser free?

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

### Is Scan QR Code & Barcode free?

Scan QR Code & Barcode is free to download, with in-app purchases available.

### Which has better reviews, Smart Diffuser or Scan QR Code & Barcode?

Smart Diffuser is rated higher. Smart Diffuser averages 5.0 out of 5 from 3 ratings, while Scan QR Code & Barcode averages 4.2 from 36 ratings.

### Do Smart Diffuser or Scan QR Code & Barcode have ads?

Scan QR Code & Barcode shows ads; Smart Diffuser does not.

### Which is updated more often, Smart Diffuser or Scan QR Code & Barcode?

Smart Diffuser ships an update every 5 months, and Scan QR Code & Barcode every 3 weeks. Most recently, Smart Diffuser was updated on September 18, 2026 and Scan QR Code & Barcode on September 18, 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.*