# Monad Calendar Clock vs Flat Earth Pro

The clearest difference is review sentiment: Flat Earth Pro at 80% against Monad Calendar Clock's 22%. Flat Earth Pro also leads on rating (4.9 vs 3.7) and ratings volume (108 vs 14). Monad Calendar Clock's advantage is price ($0.99 vs $3.99). On update cadence, ads, in-app purchases and device support there is nothing between them.

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

Flat Earth Pro holds the better App Store score, 4.9 against 3.7. That said, the two scores are not equally well evidenced: Flat Earth Pro has 108 ratings behind it against 14, so its average is the more settled of the two. Written reviews point the same way: 22% of Monad Calendar Clock's written reviews are positive against 80% of Flat Earth Pro's.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on September 6, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Monad Calendar Clock | Flat Earth Pro |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Rating | [3.7 (14 ratings)](https://appshunter.io/ios/app/monad-calendar-clock/id1437026437/reviews) | **[4.9 (108 ratings)](https://appshunter.io/ios/app/flat-earth-pro/id1664580677/reviews)** |
| Number of ratings | 14 | **108** |
| Positive reviews | 22.2% of reviews | **80.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Paid | **Free** |
| Size | 266 MB | 224 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) | [Othman Alzahrani](https://appshunter.io/developer/1664580679) |

## 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


### Flat Earth Pro

[App page](https://appshunter.io/ios/app/flat-earth-pro/id1664580677)

Visualize celestial body positions, daylight coverage, and moon phases on an Earth projection. Explore sun and moon overhead positions, rise/set times, and lunar details. Features offline functionality and a local weather forecast.

**Highlights:** Daylight coverage visualization, Sun and moon overhead positions, Rise and set times, Moon phases and libration, Offline functionality, Local weather forecast

**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 Flat Earth Pro free?

Flat Earth Pro costs $3.99, with no in-app purchases.

### Which has better reviews, Monad Calendar Clock or Flat Earth Pro?

Flat Earth Pro is rated higher. Monad Calendar Clock averages 3.7 out of 5 from 14 ratings, while Flat Earth Pro averages 4.9 from 108 ratings.

### Do Monad Calendar Clock or Flat Earth Pro have ads?

Neither Monad Calendar Clock nor Flat Earth Pro shows ads.

### Which is updated more often, Monad Calendar Clock or Flat Earth Pro?

Monad Calendar Clock ships an update every 6 weeks, and Flat Earth Pro every 6 weeks. Most recently, Monad Calendar Clock was updated on September 6, 2026 and Flat Earth Pro on September 20, 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.*