# Desktop Astro Clock vs Momentous Clock

The clearest difference is rating: Momentous Clock at 5.0 against Desktop Astro Clock's 3.7. Momentous Clock also leads on update cadence (every 6 days vs every 9 months) and iOS requirement (15.1 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Momentous Clock holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

Desktop Astro Clock ships an update every 9 months, Momentous Clock every 6 days. The most recent releases landed on June 5, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Desktop Astro Clock | Momentous Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/desktop-astro-clock/id1588806370/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/momentous-clock/id1608715857/reviews)** |
| Number of ratings | **3** | 2 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 6 days** |
| Monetization | Free | Free |
| Size | 416 MB | 24 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BEHR Consulting International](https://appshunter.io/developer/385816833) | [Tutukain Software, LLC](https://appshunter.io/developer/1608715859) |

## What reviewers say

### 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


### Momentous Clock

[App page](https://appshunter.io/ios/app/momentous-clock/id1608715857)

This app transforms your device's clock into a dynamic display of mathematical properties and number theory facts for the current time. It optionally reveals personal number connections from your contacts, all processed securely on your device.

**Highlights:** Computes mathematical properties of time, Surfaces number theory facts, Displays time on 16-segment LED screens, Finds personal number connections in contacts, On-device contact matching, Works via Catalyst on Mac

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Desktop Astro Clock free?

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

### Is Momentous Clock free?

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

### Which has better reviews, Desktop Astro Clock or Momentous Clock?

Momentous Clock is rated higher. Desktop Astro Clock averages 3.7 out of 5 from 3 ratings, while Momentous Clock averages 5.0 from 2 ratings.

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

Neither Desktop Astro Clock nor Momentous Clock shows ads.

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

Desktop Astro Clock ships an update every 9 months, and Momentous Clock every 6 days. Most recently, Desktop Astro Clock was updated on June 5, 2026 and Momentous Clock on June 4, 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.*