# Solar System Clock vs PlanetLoopTimer

The clearest difference is in-app purchases: PlanetLoopTimer at none against Solar System Clock's 1. PlanetLoopTimer also leads on iOS requirement (15.1 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on September 30, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Solar System Clock | PlanetLoopTimer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 26 MB | 31 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sunita George](https://appshunter.io/developer/1777332550) | [Tatsuro Saito](https://appshunter.io/developer/1541469434) |

## 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 |


### PlanetLoopTimer

[App page](https://appshunter.io/ios/app/planetlooptimer/id6767539058)

**Features:** macOS Compatibility, Vision Pro support

**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 PlanetLoopTimer free?

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

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

Neither Solar System Clock nor PlanetLoopTimer shows ads.

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

Solar System Clock ships an update every 6 weeks, and PlanetLoopTimer every 6 weeks. Most recently, Solar System Clock was updated on September 30, 2026 and PlanetLoopTimer on September 24, 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.*