# Monad Calendar Clock vs EarthPi

The clearest difference is price: EarthPi at Free against Monad Calendar Clock's $0.99. EarthPi also leads on review sentiment (67% vs 22%) and rating (4.5 vs 3.7). Monad Calendar Clock's advantage is in-app purchases (none vs 1) and chart position (#191 vs unranked). On ratings volume, update cadence, ads and device support there is nothing between them.

EarthPi is free to download; Monad Calendar Clock costs $0.99 up front. EarthPi sells 1 one-off in-app purchase. Monad Calendar Clock asks for nothing beyond the download.

EarthPi holds the better App Store score, 4.5 against 3.7. Both are backed by a comparable volume of ratings — 14 and 16 respectively. Written reviews point the same way: 22% of Monad Calendar Clock's written reviews are positive against 67% of EarthPi's.

Monad Calendar Clock ships an update every 6 weeks, EarthPi every 3 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Monad Calendar Clock | EarthPi |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.7 (14 ratings)](https://appshunter.io/ios/app/monad-calendar-clock/id1437026437/reviews) | **[4.5 (16 ratings)](https://appshunter.io/ios/app/earthpi/id6741358020/reviews)** |
| Number of ratings | 14 | **16** |
| Positive reviews | 22.2% of reviews | **66.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#191** | — |
| Size | 266 MB | 116 MB |
| Requires iOS | 13.0 | **12.0** |
| 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)

**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


### EarthPi

[App page](https://appshunter.io/ios/app/earthpi/id6741358020)

Explore Earth with 27 interactive map projections. Visualize the planet from different angles, adjust time to see sunlight, and track celestial bodies. Save your discoveries with screenshot functionality.

**Highlights:** 27 Earth projections, Smooth projection transitions, Time control for sunlight simulation, Celestial tracking (sun and moon), Screenshot functionality

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EarthPi Premium | $3.99 | one-time |


## Frequently asked questions

### Is Monad Calendar Clock free?

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

### Is EarthPi free?

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

### Which has better reviews, Monad Calendar Clock or EarthPi?

EarthPi is rated higher. Monad Calendar Clock averages 3.7 out of 5 from 14 ratings, while EarthPi averages 4.5 from 16 ratings.

### Do Monad Calendar Clock or EarthPi have ads?

Neither Monad Calendar Clock nor EarthPi shows ads.

### Which is updated more often, Monad Calendar Clock or EarthPi?

Monad Calendar Clock ships an update every 6 weeks, and EarthPi every 3 months. Most recently, Monad Calendar Clock was updated on October 29, 2026 and EarthPi on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*