Comparison

Epicenter vs Tsunami US

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

Head to head
About

Epicenter

Explore global earthquake activity from the past 30 days on an interactive globe. View detailed information, animate seismic events over time, and customize map displays. Includes companion apps for Apple Watch and a Today Widget for quick access to recent data.

Highlights
  • 30 days of global earthquake data
  • Interactive rotatable and zoomable globe
  • Earthquake details (magnitude, depth, source)
  • Date scroller and animation
  • Customizable map terrain and fault lines
  • Apple Watch app for recent data
  • Today Widget for quick access
Features
Read full description

Epicenter — Global Earthquake Monitoring & Alerts Track global seismic activity with timely earthquake notifications, one of the most comprehensive earthquake catalogs available on a mobile device, and powerful tools for exploring earthquakes in space and time. Built on trusted public seismic reporting agencies, Epicenter helps you monitor, understand, and visualize earthquakes worldwide. MONITOR EARTHQUAKES THAT MATTER TO YOU Receive timely notifications for significant earthquakes worldwide and monitor the places and seismic regions that matter most to you. • Worldwide earthquake notifications • Location-based notifications • Watched locations important to you • Watched seismic regions • Notification history and earthquake summaries • Built on multiple trusted global and regional seismic reporting agencies EXPLORE EARTHQUAKES WORLDWIDE View one of the most detailed interactive earthquake maps available on a mobile device. • Worldwide catalog of 25,000+ recent earthquakes updated from multiple public seismic reporting agencies • Interactive 3D globe with pan and zoom • Explore earthquake distributions beneath the Earth's surface with interactive 3D Seismicity • Time Explorer with day-by-day or hour-by-hour playback • Earthquake List View with sorting, filtering, and search • Filter the List View for non-earthquake events like landslides, quarry blasts, explosions, and more • Fly directly to earthquakes and locations of interest UNDERSTAND GLOBAL SEISMICITY Understand earthquakes as part of a larger geological system. • Magnitude and depth visualization • Worldwide plate boundaries • Global fault datasets • Detailed earthquake data • Multiple terrain styles • Geological descriptions and annotations BUILT FOR APPLE DEVICES Designed to feel at home across the Apple ecosystem. • New - Home Screen Widgets • iPhone and iPad support • Light and Dark modes • Apple Watch companion • Mac compatibility via iPad support BUILT BY A SEISMOLOGIST • Designed for accuracy, transparency, and insight. PREMIUM FEATURES Epicenter+ expands Epicenter with advanced notifications, enhanced visualizations, and deeper exploration tools. Everything you enjoy in Epicenter remains free. No ads. Epicenter+ supports continued development of worldwide earthquake monitoring and analysis tools. Epicenter delivers timely notifications as earthquake solutions are published by trusted public seismic reporting agencies. Because Epicenter relies on published earthquake solutions rather than earthquake early warning infrastructure, it is not an earthquake early-warning system and should not be relied upon for emergency response or life-safety decisions. Epicenter+ Subscription Terms When you purchase an Epicenter+ subscription, payment will be charged to your Apple Account. Your subscription begins with a 30-day free trial. Unless canceled before the trial ends, your subscription will begin automatically and your Apple Account will be charged. Subscriptions are billed automatically at the beginning of each monthly or annual billing period and renew until canceled. Your account will be charged for renewal within 24 hours prior to the end of the current subscription period. Manage your subscription and turn off auto-renewal at any time in Settings → [your name] → Subscriptions on your device or through the App Store. To avoid being charged for the next billing period, auto-renewal must be turned off at least 24 hours before the current period ends. If you cancel, your subscription remains active until the end of the current billing period. When your Epicenter+ subscription ends, the app automatically returns to its standard free mode. All billing and refunds are handled by Apple. Epicenter cannot process refunds directly. Refund requests must be submitted to Apple and are granted at Apple's discretion. Privacy Policy: https://seismology.rocks/epicenter Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Tsunami US

This app helps users understand their tsunami risk by providing inundation maps for the US West Coast and Hawaii. It offers information on tsunami warnings, preparedness, and links to relevant authorities.

Highlights
  • Tsunami inundation maps
  • Risk assessment for US West Coast
  • Risk assessment for Hawaii
  • Tsunami warning information
  • Preparedness guidance
  • Links to authorities
Features
Read full description

Tsunamis are amongst the deadliest natural disasters. Eighty percent of all tsunamis occur in the Pacific threatening in particular US' West Coast and Hawaii. Is your home located in a potential tsunami inundation zone? Is your workplace, your children's school, your favorite recreation spot or restaurant? Do you want to learn about tsunami warnings and how to prepare for the worst case? Tsunami - US West Coast contains the available tsunami inundation maps for California, Oregon, Washington State, and Hawaii and helps you to know your tsunami risk. It helps you to know whether you are located in a tsunami inundation zone and comes with a lot of information around tsunamis warnings, preparedness, and relevant links to authorities.

Screenshots

Epicenter4 screens
Tsunami US4 screens

Verdict

The call

The clearest difference is rating: Epicenter at 4.4 against Tsunami US's 2.8. Epicenter also leads on review sentiment (80% vs 50%) and update cadence (every 4 days vs every 3 months). Tsunami US's advantage is in-app purchases (none vs 2) and iOS requirement (9.0 vs 17.4). On price, ratings volume, 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. Epicenter sells 2 in-app purchases, starting at $1.99 per month. Tsunami US asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Epicenter holds the better App Store score, 4.4 against 2.8. Both are backed by a comparable volume of ratings — 39 and 17 respectively. Written reviews point the same way: 80% of Epicenter's written reviews are positive against 50% of Tsunami US's.

UpkeepUpdate frequency

Epicenter ships an update every 4 days, Tsunami US every 3 months. The most recent releases landed on September 23, 2026 and September 24, 2026 respectively.

Scorecard6 real differences · 4 level
Epicenter versus Tsunami US: the parameters behind the verdict, then further details
ParameterEpicenterTsunami US
PriceFreeFree
Rating4.4 (39 ratings) — better2.8 (17 ratings)
Positive reviews80.0% of reviews — better50.0% of reviews
Number of ratings39 — better17
Update frequencyEvery 4 days — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS17.49.0 — better
Further details — not scored
Size102 MB41 MB
Age rating4+4+
DeveloperJess TaylorMatthias Hackl

Customer experience

Epicenter

All ratings39 ratings
Positive82.1%
Neutral7.7%
Negative10.3%
Written reviews40 reviews
Positive80.0%
Neutral10.0%
Negative10.0%

Tsunami US

All ratings17 ratings
Positive41.2%
Neutral17.6%
Negative41.2%
Written reviews8 reviews
Positive50.0%
Neutral12.5%
Negative37.5%

In-app purchases

2 purchases

Epicenter

Subscriptions2
  • Epicenter+ Monthly1 Month trial$1.991 Month
  • Epicenter+ Annual1 Month trial$9.991 Year
None

Tsunami US

No in-app purchases

Questions

Is Epicenter free?
Epicenter is free to download, with in-app purchases available.
Is Tsunami US free?
Tsunami US is free to download, with no in-app purchases.
Which has better reviews, Epicenter or Tsunami US?
Epicenter is rated higher. Epicenter averages 4.4 out of 5 from 39 ratings, while Tsunami US averages 2.8 from 17 ratings.
Do Epicenter or Tsunami US have ads?
Neither Epicenter nor Tsunami US shows ads.
Which is updated more often, Epicenter or Tsunami US?
Epicenter ships an update every 4 days, and Tsunami US every 3 months. Most recently, Epicenter was updated on September 23, 2026 and Tsunami US on September 24, 2026.

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