# Disaster Alert (PDC Global) vs Temblor

The clearest difference is in-app purchases: Disaster Alert (PDC Global) at none against Temblor's 1. Disaster Alert (PDC Global) also leads on rating (4.2 vs 3.8) and ratings volume (451 vs 12). Temblor's advantage is iOS requirement (11.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Temblor sells 1 one-off in-app purchase. Disaster Alert (PDC Global) asks for nothing beyond the download.

Disaster Alert (PDC Global) holds the better App Store score, 4.2 against 3.8. That said, the two scores are not equally well evidenced: Disaster Alert (PDC Global) has 451 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 64% of Disaster Alert (PDC Global)'s written reviews are positive against 53% of Temblor's.

Disaster Alert (PDC Global) ships an update every 3 weeks, Temblor every 2 months. The most recent releases landed on October 23, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Disaster Alert (PDC Global) | Temblor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (451 ratings)](https://appshunter.io/ios/app/disaster-alert-pdc-global/id381289235/reviews)** | [3.8 (12 ratings)](https://appshunter.io/ios/app/temblor/id879904452/reviews) |
| Number of ratings | **451** | 12 |
| Positive reviews | **64.0% of reviews** | 52.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 150 MB | 16 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Pacific Disaster Center](https://appshunter.io/developer/381289238) | [Temblor, Inc.](https://appshunter.io/developer/950124291) |

## What reviewers say

### Disaster Alert (PDC Global)

[App page](https://appshunter.io/ios/app/disaster-alert-pdc-global/id381289235)

Stay informed about global natural disasters with real-time hazard alerts and impact reports. Customize warnings for your area and access visualized data from verified sources to help you stay safe.

**Highlights:** Real-time hazard alerts, 18 types of natural hazards, Customizable early warning alerts, Estimated impact reports, Visualized modeled hazard data, Interactive map interface

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

**In-app purchases:** none

**What reviewers like**

- ⭐ Accurate and detailed information
- 🌍 Comprehensive global coverage
- 👍 Informative and useful app
- 📊 Provides situational awareness

**What reviewers complain about**

- 🐛 Bugs and glitches after updates
- 🔍 Difficult to navigate and use
- ⏱️ Slow loading times
- 🔒 Forced account creation to access features

**Reported bugs**

- App freezes or crashes on launch
- Notification count not clearing properly
- Map and layers not functioning correctly
- Login and account issues

**Requested features**

- Add GPS location and time filtering options
- Improve notification system and customization
- Provide more detailed and up-to-date information
- Enhance user interface and experience


### Temblor

[App page](https://appshunter.io/ios/app/temblor/id879904452)

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:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Additional Notification Criteria and Remove Ad's | $0.99 | one-time |


## Frequently asked questions

### Is Disaster Alert (PDC Global) free?

Disaster Alert (PDC Global) is free to download, with no in-app purchases.

### Is Temblor free?

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

### Which has better reviews, Disaster Alert (PDC Global) or Temblor?

Disaster Alert (PDC Global) is rated higher. Disaster Alert (PDC Global) averages 4.2 out of 5 from 451 ratings, while Temblor averages 3.8 from 12 ratings.

### Do Disaster Alert (PDC Global) or Temblor have ads?

Neither Disaster Alert (PDC Global) nor Temblor shows ads.

### Which is updated more often, Disaster Alert (PDC Global) or Temblor?

Disaster Alert (PDC Global) ships an update every 3 weeks, and Temblor every 2 months. Most recently, Disaster Alert (PDC Global) was updated on October 23, 2026 and Temblor on October 17, 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.*