# Smart Diffuser vs 3i

The clearest difference is review sentiment: 3i at 72% against Smart Diffuser's 25%. 3i also leads on rating (4.9 vs 2.7) and ratings volume (333 vs 6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

3i holds the better App Store score, 4.9 against 2.7. That said, the two scores are not equally well evidenced: 3i has 333 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 25% of Smart Diffuser's written reviews are positive against 72% of 3i's.

Smart Diffuser ships an update every 6 weeks, 3i every 11 days. The most recent releases landed on July 7, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Smart Diffuser | 3i |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (6 ratings)](https://appshunter.io/ios/app/smart-diffuser/id1436466932/reviews) | **[4.9 (333 ratings)](https://appshunter.io/ios/app/3i/id1625845488/reviews)** |
| Number of ratings | 6 | **333** |
| Positive reviews | 25.0% of reviews | **72.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 11 days** |
| Monetization | Free | Free |
| Size | 42 MB | 279 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [秦庚 蒋](https://appshunter.io/developer/1436462643) | [深圳市杉川智能科技有限公司](https://appshunter.io/developer/1680092577) |

## 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


### 3i

[App page](https://appshunter.io/ios/app/3i/id1625845488)

Easily connect and control your smart devices from your mobile phone. Manage settings, schedule tasks, and monitor device status remotely. Enjoy firmware updates and share device access with family.

**Highlights:** Remote control and setup, Real-time status view, Schedule automated tasks, Do not disturb mode, Firmware upgrades, Share device access

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

**In-app purchases:** none


## Frequently asked questions

### Is Smart Diffuser free?

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

### Is 3i free?

3i is free to download, with no in-app purchases.

### Which has better reviews, Smart Diffuser or 3i?

3i is rated higher. Smart Diffuser averages 2.7 out of 5 from 6 ratings, while 3i averages 4.9 from 333 ratings.

### Do Smart Diffuser or 3i have ads?

Neither Smart Diffuser nor 3i shows ads.

### Which is updated more often, Smart Diffuser or 3i?

Smart Diffuser ships an update every 6 weeks, and 3i every 11 days. Most recently, Smart Diffuser was updated on July 7, 2026 and 3i on September 19, 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.*