Comparison

Temblor vs CalMatters

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

Head to head
About

Temblor

Understand your personal earthquake risk with detailed information and real-time global earthquake data. Receive notifications for nearby quakes and access news and analyses on earthquake science and events.

Highlights
  • Personalized earthquake risk assessment
  • Global earthquake monitoring
  • Real-time quake notifications
  • Hazard map layers (shaking, liquefaction)
  • Earthquake news and analysis
  • View global fault lines
Features
Read full description

Temblor gives individuals the tools to understand their personal earthquake risk. Temblor provides free individualized earthquake risk information to the public. It’s the same basic info that we license to the insurance industry — the difference being volume of locations and depth of the analysis. This distinguishes us from other risk model vendors (e.g., RMS, AIR, CoreLogic), which are closed to the public. “Impressive Earthquake App. Way more here than the other 'earthquake apps.'” — J.D. Check your risk Under the “Your Risk” tab, enter your home address (or a city, state or geographic landmark) or find your location and instantly see the earthquake magnitude that location is likely to experience in your lifetime. Use the map layers to explore various hazards including shaking, liquefaction susceptibility, wildfire hazard and more (depending on location). Check your risk everywhere on Earth. Pan and zoom to view all recent earthquakes anywhere on the planet. Temblor merges earthquake catalogs from the major seismic agencies around the world into one real-time display of global earthquakes in the past 24 hours, 2 days, 7 days or 30 days. View faults throughout the world or in your backyard. Quake Alerts Temblor will send you a notification when an earthquake strikes near your location. This is NOT an earthquake early warning and is not intended to inform you of impending shaking. Various agencies around the world distribute early earthquake warnings to earthquake-prone regions. We encourage you to seek out your local agency to receive such alerts. Temblor Earthquake News “Articles” brings you to Temblor Earthquake News, a news platform dedicated to earthquake reporting. Temblor’s mission is to provide the public with accurate, accessible, and understandable information about earthquakes. Read breaking news about major earthquakes, post-quake analyses and the latest developments in earthquake science in easy-to-understand language. Following major or particularly notable quakes, Temblor rapidly publishes accurate post-event analyses to inform the public and support institutional and commercial responses. Temblor is an approved Google News source and has been cited in major news outlets.

About

CalMatters

Access in-depth, nonpartisan news and analysis focused on California's quality of life issues. Hold leaders accountable with investigative journalism covering the Golden State and its global economic impact.

Highlights
  • In-depth news analysis
  • Focus on quality of life issues
  • Investigative journalism
  • Accountability reporting
  • Covers California and its economy
Features
Read full description

CalMatters is a nonpartisan and nonprofit news organization bringing Californians stories that probe, explain and explore solutions to quality of life issues while holding our leaders accountable. We are the only journalism outlet dedicated to covering America’s biggest state, 39 million Californians and the world’s fifth largest economy.

Screenshots

Temblor4 screens
CalMatters4 screens

Verdict

The call

The clearest difference is rating: CalMatters at 5.0 against Temblor's 3.8. CalMatters also leads on in-app purchases (none vs 1) and update cadence (fortnightly vs every 2 months). Temblor's advantage is iOS requirement (11.0 vs 15.0). On price, review sentiment, ratings volume and ads 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. Temblor sells 1 one-off in-app purchase. CalMatters asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

CalMatters holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 12 and 18 respectively. Written reviews complicate that: 53% of Temblor's written reviews are positive against 50% of CalMatters's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Temblor ships an update every 2 months, CalMatters fortnightly. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

Scorecard6 real differences · 5 level
Temblor versus CalMatters: the parameters behind the verdict, then further details
ParameterTemblorCalMatters
PriceFreeFree
Rating3.8 (12 ratings)5.0 (18 ratings) — better
Positive reviews52.6% of reviews — better50.0% of reviews
Number of ratings1218 — better
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
Best chart rank—#210 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size16 MB53 MB
Age rating4+12+
DeveloperTemblor, Inc.CalMatters

Customer experience

Temblor

All ratings11 ratings
Positive63.6%
Neutral9.1%
Negative27.3%
Written reviews38 reviews
Positive52.6%
Neutral7.9%
Negative39.5%

CalMatters

All ratings18 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

1 purchases

Temblor

One-time1
  • Unlock Additional Notification Criteria and Remove Ad's$0.99
None

CalMatters

No in-app purchases

Questions

Is Temblor free?
Temblor is free to download, with in-app purchases available.
Is CalMatters free?
CalMatters is free to download, with no in-app purchases.
Which has better reviews, Temblor or CalMatters?
CalMatters is rated higher. Temblor averages 3.8 out of 5 from 12 ratings, while CalMatters averages 5.0 from 18 ratings.
Do Temblor or CalMatters have ads?
Neither Temblor nor CalMatters shows ads.
Which is updated more often, Temblor or CalMatters?
Temblor ships an update every 2 months, and CalMatters fortnightly. Most recently, Temblor was updated on October 7, 2026 and CalMatters on October 12, 2026.

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