# DEWN vs Tsunami

The clearest difference is in-app purchases: DEWN at none against Tsunami's 2. DEWN also leads on iOS requirement (9.0 vs 15.1). Tsunami's advantage is update cadence (every 5 weeks vs every 11 months). On price, ads and device support there is nothing between them.

Both are free to download. Tsunami sells 2 in-app purchases, starting at $1.99 per month. DEWN asks for nothing beyond the download.

DEWN ships an update every 11 months, Tsunami every 5 weeks. The most recent releases landed on October 11, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | DEWN | Tsunami |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tsunami-watch/id6757628320/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 weeks** |
| Monetization | — | Subscription |
| Size | 17 MB | 54 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Futura Tech Labs Pte, Ltd](https://appshunter.io/developer/1746862716) | [Daniel Dale Boydston](https://appshunter.io/developer/1867964213) |

## What reviewers say

### DEWN

[App page](https://appshunter.io/ios/app/dewn/id1121502926)

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

**In-app purchases:** none


### Tsunami

[App page](https://appshunter.io/ios/app/tsunami-watch/id6757628320)

Receive instant, life-saving alerts for tsunami warnings, advisories, and watches worldwide. This app provides clear, actionable information from official sources to help coastal residents and travelers stay informed and act quickly during emergencies.

**Highlights:** Real-time push notifications for tsunami alerts, Concise alert details on an easy-to-understand dashboard, Interactive map to visualize threats, Reliable official data aggregation, Privacy-first design with no ads

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Push Notifications | $1.99 | per month |
| 1 Year Push Notifications | $19.99 | per year |


## Frequently asked questions

### Is DEWN free?

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

### Is Tsunami free?

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

### Do DEWN or Tsunami have ads?

Neither DEWN nor Tsunami shows ads.

### Which is updated more often, DEWN or Tsunami?

DEWN ships an update every 11 months, and Tsunami every 5 weeks. Most recently, DEWN was updated on October 11, 2026 and Tsunami on October 26, 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.*