# Calendar Clock vs Desktop Astro Clock

The clearest difference is price: Desktop Astro Clock at Free against Calendar Clock's $0.99. Desktop Astro Clock also leads on update cadence (every 9 months vs every 41 months) and iOS requirement (17.0 vs 26.5). On ads, in-app purchases and device support there is nothing between them.

Desktop Astro Clock is free to download; Calendar Clock costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calendar Clock ships an update every 41 months, Desktop Astro Clock every 9 months. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Calendar Clock | Desktop Astro Clock |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/desktop-astro-clock/id1588806370/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 9 months** |
| Monetization | Paid | **Free** |
| Size | 4 MB | 416 MB |
| Requires iOS | 26.5 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Systemiko Inc.](https://appshunter.io/developer/680630947) | [BEHR Consulting International](https://appshunter.io/developer/385816833) |

## What reviewers say

### Calendar Clock

[App page](https://appshunter.io/ios/app/calendar-clock/id1451445740)

This app displays the current year, month, week, and time on a single screen with a clean design. It offers customizable theme colors and functions as a desk clock. The app disables device sleep mode while active.

**Highlights:** All-in-one screen display, Year, month, week, day, hour, minute, second, Switchable theme colors (dark, light, green, blue), Disables device sleep mode, Acts as a desk clock

**Features:** macOS Compatibility

**In-app purchases:** none


### Desktop Astro Clock

[App page](https://appshunter.io/ios/app/desktop-astro-clock/id1588806370)

This utility app displays time in various formats, including Julian, Sidereal, and GMT. It offers always-on display options, moon and meteor shower information, and customizable clock configurations. Widgets and a watchOS app are also supported for enhanced functionality.

**Highlights:** Multiple time formats (Julian, Sidereal, GMT), Always-on display with battery threshold, Moon phase and meteor shower information, Customizable display configurations, Widget support, WatchOS app with specialized displays

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calendar Clock free?

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

### Is Desktop Astro Clock free?

Desktop Astro Clock is free to download, with no in-app purchases.

### Do Calendar Clock or Desktop Astro Clock have ads?

Neither Calendar Clock nor Desktop Astro Clock shows ads.

### Which is updated more often, Calendar Clock or Desktop Astro Clock?

Calendar Clock ships an update every 41 months, and Desktop Astro Clock every 9 months. Most recently, Calendar Clock was updated on October 24, 2026 and Desktop Astro Clock on October 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.*