# Flood Map USA vs CoastWarn

The clearest difference is ads: CoastWarn at none against Flood Map USA's shown. CoastWarn also leads on update cadence (every 6 days vs monthly). Flood Map USA's advantage is monetization model (ad-supported vs free with in-app purchases) and ratings volume (3 vs 1). On price, rating, in-app purchases and device support there is nothing between them.

Both are free to download. Flood Map USA sells 1 one-off in-app purchase and CoastWarn sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Flood Map USA against 5.0 for CoastWarn. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Flood Map USA ships an update monthly, CoastWarn every 6 days. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Flood Map USA | CoastWarn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/flood-map-usa/id6762403817/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/coastwarn/id6798089542/reviews) |
| Number of ratings | **3** | 1 |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 6 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 4 MB | 3 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Qvyshift LLC](https://appshunter.io/developer/1536442361) | [Ryan Dean](https://appshunter.io/developer/1850630498) |

## What reviewers say

### Flood Map USA

[App page](https://appshunter.io/ios/app/flood-map-usa/id6762403817)

This app helps you identify flood-prone areas near a specific U.S. street address. It can generate printable maps or interactive overlays based on available FEMA flood study data. Useful for risk assessment before or after severe weather events.

**Highlights:** Flood zone identification by address, FEMA flood study data integration, Printable PDF flood maps, Interactive map (beta), Risk assessment tool, Supports U.S. addresses

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $6.99 | one-time |


### CoastWarn

[App page](https://appshunter.io/ios/app/coastwarn/id6798089542)

Receive timely alerts for coastal flooding based on your custom water-level thresholds. Monitor NOAA data, get tide charts, and stay informed about potential flood events affecting your property or boat.

**Highlights:** Customizable flood alert thresholds, NOAA water-level monitoring, Tide charts and predictions, Flood expected notifications, Alert history, Station map search

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CoastWarn Lifetime Unlock | $19.99 | one-time |


## Frequently asked questions

### Is Flood Map USA free?

Flood Map USA is free to download, with in-app purchases available.

### Is CoastWarn free?

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

### Which has better reviews, Flood Map USA or CoastWarn?

Flood Map USA and CoastWarn are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do Flood Map USA or CoastWarn have ads?

Flood Map USA shows ads; CoastWarn does not.

### Which is updated more often, Flood Map USA or CoastWarn?

Flood Map USA ships an update monthly, and CoastWarn every 6 days. Most recently, Flood Map USA was updated on October 6, 2026 and CoastWarn on October 3, 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.*