# KATWARN vs PrepAlert

The clearest difference is in-app purchases: KATWARN at none against PrepAlert's 1. KATWARN also leads on iOS requirement (9.0 vs 17.0). PrepAlert's advantage is update cadence (every 2 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. PrepAlert sells 1 one-off in-app purchase. KATWARN asks for nothing beyond the download.

KATWARN ships an update every 4 months, PrepAlert every 2 days. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | KATWARN | PrepAlert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (3 ratings)](https://appshunter.io/ios/app/katwarn/id566560753/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 8 MB | 9 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CombiRisk - Riskmanagement GmbH](https://appshunter.io/developer/566560756) | [Michael Stuut](https://appshunter.io/developer/1886367246) |

## What reviewers say

### KATWARN

[App page](https://appshunter.io/ios/app/katwarn/id566560753)

Receive location-based alerts for dangers and disasters across Germany. Get notified about major fires, extreme weather, and other critical events for your current location and up to seven additional chosen areas. The app uses energy-efficient location services to minimize battery drain.

**Highlights:** Location-based alerts for up to 8 locations, Zip code precise warnings, Color-coded warning levels, Energy-efficient battery usage, Real-time danger area notifications, Feedback function

**Features:** Vision Pro support

**In-app purchases:** none


### PrepAlert

[App page](https://appshunter.io/ios/app/prepalert/id6761410554)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| prepalert Pro | $3.99 | one-time |


## Frequently asked questions

### Is KATWARN free?

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

### Is PrepAlert free?

PrepAlert is free to download, with in-app purchases available.

### Do KATWARN or PrepAlert have ads?

Neither KATWARN nor PrepAlert shows ads.

### Which is updated more often, KATWARN or PrepAlert?

KATWARN ships an update every 4 months, and PrepAlert every 2 days. Most recently, KATWARN was updated on October 11, 2026 and PrepAlert on October 1, 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.*