# 홍수알리미 vs 인에어(inair)

홍수알리미 and 인에어(inair) are too close to call on the numbers: across 7 compared parameters — price, review sentiment, update cadence and ads among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

홍수알리미 ships an update every 5 months, 인에어(inair) every 9 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 홍수알리미 | 인에어(inair) |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 94.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 9 months |
| Monetization | — | Free |
| Size | 3 MB | 14 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [한강홍수통제소](https://appshunter.io/developer/578871388) | [한국환경공단](https://appshunter.io/developer/873915688) |

## What reviewers say

### 홍수알리미

[App page](https://appshunter.io/ios/app/id946789489)

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

**In-app purchases:** none


### 인에어(inair)

[App page](https://appshunter.io/ios/app/inair/id1560468948)

This app provides real-time fine dust (PM-2.5) measurements from subway stations across the country. It offers hourly and 24-hour moving average data, a collaboration between environmental agencies and railway operators.

**Highlights:** Real-time PM-2.5 measurements, Subway station data, Hourly average data, 24-hour moving average data, Nationwide coverage

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 홍수알리미 free?

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

### Is 인에어(inair) free?

인에어(inair) is free to download, with no in-app purchases.

### Do 홍수알리미 or 인에어(inair) have ads?

Neither 홍수알리미 nor 인에어(inair) shows ads.

### Which is updated more often, 홍수알리미 or 인에어(inair)?

홍수알리미 ships an update every 5 months, and 인에어(inair) every 9 months. Most recently, 홍수알리미 was updated on November 1, 2026 and 인에어(inair) on October 30, 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.*