# Monad Calendar Clock vs 天球模擬器

The clearest difference is price: 天球模擬器 at Free against Monad Calendar Clock's $0.99. 天球模擬器 also leads on update cadence (every 3 days vs every 6 weeks). Monad Calendar Clock's advantage is chart position (#191 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

天球模擬器 is free to download; Monad Calendar Clock costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Monad Calendar Clock ships an update every 6 weeks, 天球模擬器 every 3 days. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Monad Calendar Clock | 天球模擬器 |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[3.7 (14 ratings)](https://appshunter.io/ios/app/monad-calendar-clock/id1437026437/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 22.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Monetization | Paid | — |
| Best chart rank | **#191** | — |
| Size | 266 MB | 19 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Earth at the Center LLC](https://appshunter.io/developer/1437026436) | [Han-Chiang Chou](https://appshunter.io/developer/1883578938) |

## What reviewers say

### Monad Calendar Clock

[App page](https://appshunter.io/ios/app/monad-calendar-clock/id1437026437)

**Currently charting:** #191 Top Paid · Education (US App Store)

This app visualizes time through planetary and celestial movements, contrasting natural rhythms with mechanical time. It offers unique perspectives on Earth's position in space and time, showing star and planet locations, seasonal changes, and lunar phases.

**Highlights:** Planetary time and date display, Celestial ring visualization, Heliocentric and Geocentric modes, Star and planet location tracking, Seasonal and lunar phase progression, Twilight and sunrise/sunset times, Event scheduling

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

**In-app purchases:** none


### 天球模擬器

[App page](https://appshunter.io/ios/app/id6760458030)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Monad Calendar Clock free?

Monad Calendar Clock costs $0.99, with no in-app purchases.

### Is 天球模擬器 free?

天球模擬器 is free to download, with no in-app purchases.

### Do Monad Calendar Clock or 天球模擬器 have ads?

Neither Monad Calendar Clock nor 天球模擬器 shows ads.

### Which is updated more often, Monad Calendar Clock or 天球模擬器?

Monad Calendar Clock ships an update every 6 weeks, and 天球模擬器 every 3 days. Most recently, Monad Calendar Clock was updated on October 29, 2026 and 天球模擬器 on October 25, 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.*