# DifCal vs Monad Calendar Clock

The clearest difference is update cadence: Monad Calendar Clock at every 6 weeks against DifCal's every 15 months. Monad Calendar Clock also leads on price ($0.99 vs $1.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

DifCal costs $1.99 and Monad Calendar Clock $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DifCal ships an update every 15 months, Monad Calendar Clock every 6 weeks. The most recent releases landed on May 16, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | DifCal | Monad Calendar Clock |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| 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 15 months | **Every 6 weeks** |
| Monetization | — | Paid |
| Size | 9 MB | 266 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sean Brennan](https://appshunter.io/developer/898026482) | [Earth at the Center LLC](https://appshunter.io/developer/1437026436) |

## What reviewers say

### DifCal

[App page](https://appshunter.io/ios/app/difcal/id898026479)

**In-app purchases:** none


### 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


## Frequently asked questions

### Is DifCal free?

DifCal costs $1.99, with no in-app purchases.

### Is Monad Calendar Clock free?

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

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

Neither DifCal nor Monad Calendar Clock shows ads.

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

DifCal ships an update every 15 months, and Monad Calendar Clock every 6 weeks. Most recently, DifCal was updated on May 16, 2026 and Monad Calendar Clock on September 6, 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.*