# Monad Calendar Clock vs Celestial Simulation

The clearest difference is price: Monad Calendar Clock at $0.99 against Celestial Simulation's $3.99. Monad Calendar Clock also leads on iOS requirement (13.0 vs 18.5). On ads, in-app purchases and device support there is nothing between them.

Monad Calendar Clock costs $0.99 and Celestial Simulation $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Monad Calendar Clock | Celestial Simulation |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| 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 | — |
| Monetization | Paid | — |
| Size | 266 MB | 88 MB |
| Requires iOS | **13.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Earth at the Center LLC](https://appshunter.io/developer/1437026436) | [Dung Le](https://appshunter.io/developer/1850828414) |

## What reviewers say

### Monad Calendar Clock

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

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


### Celestial Simulation

[App page](https://appshunter.io/ios/app/celestial-simulation/id6756852871)

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

**In-app purchases:** none


## Frequently asked questions

### Is Monad Calendar Clock free?

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

### Is Celestial Simulation free?

Celestial Simulation costs $3.99, with no in-app purchases.

### Do Monad Calendar Clock or Celestial Simulation have ads?

Neither Monad Calendar Clock nor Celestial Simulation 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.*