# Planetary Clock vs Solar System Viewer

The clearest difference is rating: Planetary Clock at 4.9 against Solar System Viewer's 4.4. Planetary Clock also leads on in-app purchases (none vs 4) and price ($0.99 vs $2.99). Solar System Viewer's advantage is update cadence (every 2 months vs every 27 months) and review sentiment (83% vs 57%). On ratings volume, ads, monetization model and device support there is nothing between them.

Planetary Clock costs $0.99 and Solar System Viewer $2.99 up front. Solar System Viewer sells 4 one-off in-app purchases. Planetary Clock asks for nothing beyond the download.

Planetary Clock holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 34 and 28 respectively. Written reviews complicate that: 57% of Planetary Clock's written reviews are positive against 83% of Solar System Viewer's, so the app with the better star average is not the one people write more warmly about.

Planetary Clock ships an update every 27 months, Solar System Viewer every 2 months. The most recent releases landed on August 19, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Planetary Clock | Solar System Viewer |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| Rating | **[4.9 (34 ratings)](https://appshunter.io/ios/app/planetary-clock/id812876503/reviews)** | [4.4 (28 ratings)](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445/reviews) |
| Number of ratings | **34** | 28 |
| Positive reviews | 57.1% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 14 MB | 22 MB |
| Requires iOS | **11.4** | 26.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Piotr Knapczyk](https://appshunter.io/developer/1541886746) | [BLUE COMET LABS LLC](https://appshunter.io/developer/1492055170) |

## 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 Viewer

[App page](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445)

Explore and simulate the orbits of planets in our solar system. This app allows you to speed up or slow down time, travel to any date, and view planetary positions. It also offers widgets for your home screen and Apple Watch complications.

**Highlights:** Simulate planetary orbits, Adjust time speed, Time travel to specific dates, Home screen widgets, Apple Watch integration, View planet overviews

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Io Tip | $1.99 | one-time |
| Europa Tip | $3.99 | one-time |
| Ganymede Tip | $5.99 | one-time |
| Callisto Tip | $9.99 | one-time |


## Frequently asked questions

### Is Planetary Clock free?

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

### Is Solar System Viewer free?

Solar System Viewer costs $2.99, and also offers in-app purchases.

### Which has better reviews, Planetary Clock or Solar System Viewer?

Planetary Clock is rated higher. Planetary Clock averages 4.9 out of 5 from 34 ratings, while Solar System Viewer averages 4.4 from 28 ratings.

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

Neither Planetary Clock nor Solar System Viewer shows ads.

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

Planetary Clock ships an update every 27 months, and Solar System Viewer every 2 months. Most recently, Planetary Clock was updated on August 19, 2026 and Solar System Viewer on September 18, 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.*