# 에어코리아 vs 셀리온 스마트 BT

에어코리아 and 셀리온 스마트 BT both sit at 1.0 stars, but that hides the real split: 91% of 에어코리아's written reviews are positive against 25% of 셀리온 스마트 BT's. 셀리온 스마트 BT's advantage is update cadence (monthly vs every 4 months) and ratings volume (3 vs 1). On price, rating, 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.

On the App Store both sit at effectively the same score — 1.0 for 에어코리아 against 1.0 for 셀리온 스마트 BT. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews are what separate them: 91% of 에어코리아's written reviews are positive against 25% of 셀리온 스마트 BT's.

에어코리아 ships an update every 4 months, 셀리온 스마트 BT monthly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 에어코리아 | 셀리온 스마트 BT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/id873915685/reviews) | [1.0 (3 ratings)](https://appshunter.io/ios/app/bt/id1537929464/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | **91.3% of reviews** | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free | Free |
| Size | 25 MB | 23 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [한국환경공단](https://appshunter.io/developer/873915688) | [에스피케어](https://appshunter.io/developer/1537929466) |

## What reviewers say

### 에어코리아

[App page](https://appshunter.io/ios/app/id873915685)

This app provides real-time air quality information, including PM2.5, PM10, and ozone levels. It also offers air quality forecasts for today, tomorrow, and the day after. Users can even check air quality directly from their Apple Watch face.

**Highlights:** Real-time air quality monitoring, PM2.5, PM10, and O3 levels, Air quality forecasts (today/tomorrow/day after), Apple Watch complication support, Official data from government sources

**Features:** macOS Compatibility

**In-app purchases:** none


### 셀리온 스마트 BT

[App page](https://appshunter.io/ios/app/bt/id1537929464)

This app automatically adjusts the temperature of a connected heating mat based on the user's local external temperature. It uses a smart algorithm to ensure optimal comfort by syncing with real-time weather data.

**Highlights:** Automatic temperature adjustment, External temperature synchronization, Smart heating mat algorithm, User local temperature integration

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 에어코리아 free?

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

### Is 셀리온 스마트 BT free?

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

### Which has better reviews, 에어코리아 or 셀리온 스마트 BT?

에어코리아 and 셀리온 스마트 BT are both rated 1.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do 에어코리아 or 셀리온 스마트 BT have ads?

Neither 에어코리아 nor 셀리온 스마트 BT shows ads.

### Which is updated more often, 에어코리아 or 셀리온 스마트 BT?

에어코리아 ships an update every 4 months, and 셀리온 스마트 BT monthly. Most recently, 에어코리아 was updated on October 26, 2026 and 셀리온 스마트 BT 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.*