# EarthAlert vs TerraWatch

The clearest difference is in-app purchases: EarthAlert at none against TerraWatch's 1. EarthAlert also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). TerraWatch's advantage is ads (none vs shown) and update cadence (every 5 days vs fortnightly). On price there is nothing between them.

Both are free to download. TerraWatch sells 1 one-off in-app purchase. EarthAlert asks for nothing beyond the download.

EarthAlert ships an update fortnightly, TerraWatch every 5 days. The most recent releases landed on September 25, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | EarthAlert | TerraWatch |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 5 days** |
| Size | 33 MB | 1 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Takahiro Onishi](https://appshunter.io/developer/1882360032) | [Tolga Ulutas](https://appshunter.io/developer/1867266654) |

## What reviewers say

### EarthAlert

[App page](https://appshunter.io/ios/app/earthalert-earthquake-tracker/id6760021158)

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

**In-app purchases:** none


### TerraWatch

[App page](https://appshunter.io/ios/app/terrawatch/id6762412658)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TerraWatch Pro | $2.99 | one-time |


## Frequently asked questions

### Is EarthAlert free?

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

### Is TerraWatch free?

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

### Do EarthAlert or TerraWatch have ads?

EarthAlert shows ads; TerraWatch does not.

### Which is updated more often, EarthAlert or TerraWatch?

EarthAlert ships an update fortnightly, and TerraWatch every 5 days. Most recently, EarthAlert was updated on September 25, 2026 and TerraWatch on September 21, 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.*