# Solar System Clock vs Pure Clock for older systems

The clearest difference is in-app purchases: Pure Clock for older systems at none against Solar System Clock's 1. Pure Clock for older systems also leads on iOS requirement (15.6 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Solar System Clock sells 1 one-off in-app purchase. Pure Clock for older systems asks for nothing beyond the download.

## The numbers

| Metric | Solar System Clock | Pure Clock for older systems |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 2 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sunita George](https://appshunter.io/developer/1777332550) | [Sheng Zhao](https://appshunter.io/developer/1878542823) |

## What reviewers say

### Solar System Clock

[App page](https://appshunter.io/ios/app/solar-system-clock/id6737652569)

Explore the time and positions of celestial bodies across our solar system. View analog and digital clocks for planets, dwarf planets, and moons, with interactive maps and customizable widgets. Understand planetary seasons and translate times between objects.

**Highlights:** Planet and moon time displays, Analog and digital clock formats, Interactive solar system map, Customizable widgets, Planetary season information, Time translation between celestial bodies

**Features:** macOS Compatibility, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Planets and Dwarf Planets | $2.99 | one-time |


### Pure Clock for older systems

[App page](https://appshunter.io/ios/app/pure-clock-for-older-systems/id6760163576)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Solar System Clock free?

Solar System Clock is free to download, with in-app purchases available.

### Is Pure Clock for older systems free?

Pure Clock for older systems is free to download, with no in-app purchases.

### Do Solar System Clock or Pure Clock for older systems have ads?

Neither Solar System Clock nor Pure Clock for older systems shows ads.

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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.*