# HYDROINFO vs Flood Alert Watcher

The clearest difference is in-app purchases: HYDROINFO at none against Flood Alert Watcher's 3. HYDROINFO also leads on ads (none vs shown) and iOS requirement (8.0 vs 18.6). Flood Alert Watcher's advantage is update cadence (every 3 weeks vs every 9 months) and review sentiment (13% vs 0%). On price 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. HYDROINFO asks for nothing beyond the download.

HYDROINFO ships an update every 9 months, Flood Alert Watcher every 3 weeks. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | HYDROINFO | Flood Alert Watcher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (5 ratings)](https://appshunter.io/ios/app/flood-alert-watcher/id1517218014/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 0.0% of reviews | **13.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 41 MB |
| Requires iOS | **8.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Országos Vízjelző Szolgálat](https://appshunter.io/developer/1137128083) | [John Benson](https://appshunter.io/developer/376644555) |

## What reviewers say

### HYDROINFO

[App page](https://appshunter.io/ios/app/hydroinfo/id1137128084)

Access real-time water level forecasts and current ford information for Hungarian waterways. View data in text, table, graph, or map formats. Receive instant alerts for your preferred locations and check forecasts near your GPS position.

**Highlights:** Water level forecasts, Current ford information, Text, table, graph, and map data, Customizable alerts, GPS-based nearby forecasts, Favorite gauge selection

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is HYDROINFO free?

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

### Is Flood Alert Watcher free?

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

### Do HYDROINFO or Flood Alert Watcher have ads?

Flood Alert Watcher shows ads; HYDROINFO does not.

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

HYDROINFO ships an update every 9 months, and Flood Alert Watcher every 3 weeks. Most recently, HYDROINFO was updated on October 14, 2026 and Flood Alert Watcher on October 13, 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.*