Comparison

DEWN vs Tsunami

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DEWN

Features
Read full description

DEWN allows you to access disaster alerts from the Sri Lanka Disaster Management Centre (DMC). This is a collaboration between Dialog, University of Moratuwa, Microimage Mobile Media & DMC of Sri Lanka. This is a free service all citizens & anyone visiting Sri Lanka to have with them to be notified of any threats due to natural causes. Direct Alerts This APP is developed with the intention of alerting you at a time of an emergency. This version will also make use of location based services & alert you based on your last recorded location to the nearest GSM cell in the near future Things to expect from DEWN (Features are only availability to Dialog network in Sri Lanka for now) - Alerts: receive alerts directly released by DMC of Sri Lanka based on your location and threat level (i.e. if an alert is national everyone will receive the message as opposed to a regional alert) - Location: This APP will facilitate location based alerts very soon. We have built in the location map for you to know where the alert level is most relevant even if you are not in that area once DMC of Sri Lanka announces it. - Notifications: All notifications will appear as any other SMS or APP in the notification panel & will remain in-app as well.

About

Tsunami

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
Read full description

Tsunami Watch - Your Coastal Guardian Stay safe with instant notifications (paid subscription required) for tsunami warnings, advisories, and watches. Tsunami Watch delivers reliable, life-saving alerts for coastal areas worldwide, helping you and your family act quickly when every second counts. Whether you live along the Pacific Coast, in Hawaii, Alaska, the Caribbean, or travel to tsunami-prone regions like Japan, the Philippines, Indonesia, or Australia, Tsunami Watch keeps you informed with clear, actionable information from official sources. KEY FEATURES • Real-time push notifications (paid subscription required) for tsunami warnings, advisories, and watches tailored to your chosen coastlines • Easy-to-understand dashboard with concise alert details – perfect even in high-stress situations • Interactive map to visualize threats and monitor coastal risks • Reliable official data aggregated from trusted government and meteorological agencies • Privacy-first design – minimal data collection, no ads Born from a real near-miss experience during a major earthquake in the Philippines, Tsunami Watch was created to provide fast alerts for distant quakes that might not be felt but can still generate dangerous tsunamis. Perfect for: • Coastal residents in the US, Canada, Central and South America, and Pacific-bordering countries • Travelers and families wanting proactive disaster preparedness • Anyone seeking a simple, trustworthy tool for natural hazard awareness Download Tsunami Watch today and never miss a critical alert. Stay alert. Stay safe. Note: This app provides supplemental information and does not replace official emergency instructions from local authorities. Always follow guidance from emergency management officials. Privacy Policy: https://tsunami.watch/privacy/ Terms of Use (EULA): https://tsunami.watch/terms/

Screenshots

DEWN3 screens
Tsunami4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard3 real differences · 6 level
DEWN versus Tsunami: the parameters behind the verdict, then further details
ParameterDEWNTsunami
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 11 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Subscription
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS9.0 — better15.1
Further details — not scored
Size17 MB54 MB
Age rating4+4+
DeveloperFutura Tech Labs Pte, LtdDaniel Dale Boydston

In-app purchases

None

DEWN

No in-app purchases

2 purchases

Tsunami

Subscriptions2
  • 1 Month Push Notifications$1.991 Month
  • 1 Year Push Notifications$19.991 Year

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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