# Flood Alert Watcher vs One Mekong

The clearest difference is in-app purchases: One Mekong at none against Flood Alert Watcher's 3. One Mekong also leads on ads (none vs shown) and iOS requirement (15.0 vs 18.6). On price, update cadence and device support there is nothing between them.

Both are free to download. Flood Alert Watcher sells 3 in-app purchases, starting at $0.99 per month. One Mekong asks for nothing beyond the download.

Flood Alert Watcher ships an update every 3 weeks, One Mekong fortnightly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Flood Alert Watcher | One Mekong |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/flood-alert-watcher/id1517218014/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 13.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 147 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Benson](https://appshunter.io/developer/376644555) | [Thanawat Wetchapan](https://appshunter.io/developer/1778225357) |

## What reviewers say

### Flood Alert Watcher

[App page](https://appshunter.io/ios/app/flood-alert-watcher/id1517218014)

Receive real-time flood alerts and weather warnings for the UK. View interactive flood maps, understand warning levels, and get peace of mind with trusted data from the Environment Agency.

**Highlights:** Real-time flood alerts, Interactive flood maps, Environment Agency data, Three warning levels, Instant notification alerts (premium), Ad-free experience (premium)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Annual | $1.99 | per year |
| Annual | $2.99 | per year |


### One Mekong

[App page](https://appshunter.io/ios/app/one-mekong/id6737837864)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flood Alert Watcher free?

Flood Alert Watcher is free to download, with in-app purchases available.

### Is One Mekong free?

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

### Do Flood Alert Watcher or One Mekong have ads?

Flood Alert Watcher shows ads; One Mekong does not.

### Which is updated more often, Flood Alert Watcher or One Mekong?

Flood Alert Watcher ships an update every 3 weeks, and One Mekong fortnightly. Most recently, Flood Alert Watcher was updated on November 3, 2026 and One Mekong 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.*