# NDS Instructor App vs Earth Clock Calendar

The clearest difference is in-app purchases: NDS Instructor App at none against Earth Clock Calendar's 1. NDS Instructor App also leads on iOS requirement (9.1 vs 16.6). On price, ads and device support there is nothing between them.

Both are free to download. Earth Clock Calendar sells 1 one-off in-app purchase. NDS Instructor App asks for nothing beyond the download.

## The numbers

| Metric | NDS Instructor App | Earth Clock Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (9 ratings)](https://appshunter.io/ios/app/earth-clock-calendar/id1623275786/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 98 MB | 30 MB |
| Requires iOS | **9.1** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Aryan Products and Services Inc](https://appshunter.io/developer/922499271) | [Earth at the Center LLC](https://appshunter.io/developer/1437026436) |

## What reviewers say

### NDS Instructor App

[App page](https://appshunter.io/ios/app/nds-instructor-app/id1614505209)

**Features:** macOS Compatibility

**In-app purchases:** none


### Earth Clock Calendar

[App page](https://appshunter.io/ios/app/earth-clock-calendar/id1623275786)

This app visualizes time and date based on celestial movements. It displays the Earth, Moon, and Sun's positions, offering a unique perspective on timekeeping and natural rhythms. Users can explore various cultural calendars and understand their relationship to natural cycles.

**Highlights:** Earth, Moon, and Sun visualization, Planetary time and date display, Automatic time zone and location adjustment, Moon phase tracking, Zodiac sign integration for months, Sunrise and sunset times, Multiple cultural calendar options

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chinese Calendar | $0.99 | one-time |


## Frequently asked questions

### Is NDS Instructor App free?

NDS Instructor App is free to download, with no in-app purchases.

### Is Earth Clock Calendar free?

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

### Do NDS Instructor App or Earth Clock Calendar have ads?

Neither NDS Instructor App nor Earth Clock Calendar shows ads.

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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.*