# Nanzoo Clock vs Is That an Earthquake?

The clearest difference is in-app purchases: Is That an Earthquake? at none against Nanzoo Clock's 1. Is That an Earthquake? also leads on device support. Nanzoo Clock's advantage is update cadence (every 10 days vs every 34 months). On price, review sentiment and iOS requirement there is nothing between them.

Both are free to download. Nanzoo Clock sells 1 one-off in-app purchase. Is That an Earthquake? asks for nothing beyond the download.

Nanzoo Clock ships an update every 10 days, Is That an Earthquake? every 34 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Nanzoo Clock | Is That an Earthquake? |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/is-that-an-earthquake/id892584539/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | — | No |
| Update frequency | **Every 10 days** | Every 34 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 38 MB | 126 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Takafumi Sasaki](https://appshunter.io/developer/625986968) | [Ministry of Education](https://appshunter.io/developer/507340102) |

## What reviewers say

### Nanzoo Clock

[App page](https://appshunter.io/ios/app/nanzoo-clock/id625986965)

This educational app teaches children aged 3-7 how to tell time using interactive clock activities. Users can select animal clocks and practice setting and reading time with adjustable difficulty levels.

**Highlights:** Interactive animal clocks, Set the time activity, Read the time activity, Adjustable difficulty levels, Parent gate for purchases, No ads or tracking

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Level Unlock | $0.99 | one-time |


### Is That an Earthquake?

[App page](https://appshunter.io/ios/app/is-that-an-earthquake/id892584539)

This interactive digital book tells the story of a child's anxiety about potential earthquakes and the real event. It features read-to-me, read-it-myself, and narration recording options, along with an earthquake safety guide.

**Highlights:** Swipe-to-Read™, Touch-to-Hear™, Touch-to-Spell™, Read-to-me and read-it-yourself, Record narration, Color illustrations, Earthquake safety guide

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Nanzoo Clock free?

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

### Is Is That an Earthquake? free?

Is That an Earthquake? is free to download, with no in-app purchases.

### Which is updated more often, Nanzoo Clock or Is That an Earthquake??

Nanzoo Clock ships an update every 10 days, and Is That an Earthquake? every 34 months. Most recently, Nanzoo Clock was updated on November 1, 2026 and Is That an Earthquake? on November 1, 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.*