# Planetary Clock vs Solar System Clock

The clearest difference is price: Solar System Clock at Free against Planetary Clock's $0.99. Solar System Clock also leads on update cadence (every 2 days vs every 27 months). Planetary Clock's advantage is iOS requirement (11.4 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

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

Planetary Clock ships an update every 27 months, Solar System Clock every 2 days. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Planetary Clock | Solar System Clock |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.9 (34 ratings)](https://appshunter.io/ios/app/planetary-clock/id812876503/reviews)** | — |
| Number of ratings | **34** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 2 days** |
| Monetization | Paid | — |
| Size | 14 MB | 5 MB |
| Requires iOS | **11.4** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Piotr Knapczyk](https://appshunter.io/developer/1541886746) | [Mateusz Andrzejczuk](https://appshunter.io/developer/1158375886) |

## What reviewers say

### Planetary Clock

[App page](https://appshunter.io/ios/app/planetary-clock/id812876503)

Visualize the precise positions of all planets in the Solar System for any given day. It uses accurate NASA data for orbital calculations and relative planet sizing, offering a clear, educational view of celestial mechanics.

**Highlights:** Real-time planet positions, Accurate orbital calculations, Uses NASA data, Relative planet sizing, Educational solar system view

**Features:** macOS Compatibility

**In-app purchases:** none


### Solar System Clock

[App page](https://appshunter.io/ios/app/solar-system-clock/id6746730661)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Planetary Clock free?

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

### Is Solar System Clock free?

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

### Do Planetary Clock or Solar System Clock have ads?

Neither Planetary Clock nor Solar System Clock shows ads.

### Which is updated more often, Planetary Clock or Solar System Clock?

Planetary Clock ships an update every 27 months, and Solar System Clock every 2 days. Most recently, Planetary Clock was updated on October 16, 2026 and Solar System Clock on October 9, 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.*