# Solar System Clock vs Radex

The clearest difference is review sentiment: Solar System Clock at 100% against Radex's 33%. Solar System Clock also leads on ads (none vs shown). Radex's advantage is in-app purchases (none vs 1) and iOS requirement (15.0 vs 18.0). On price, update cadence and device support there is nothing between them.

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

Solar System Clock ships an update every 6 weeks, Radex every 2 months. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Solar System Clock | Radex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.3 (3 ratings)](https://appshunter.io/ios/app/radex-5g-emf-detector/id6738017621/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 26 MB | 4 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Sunita George](https://appshunter.io/developer/1777332550) | [NETM S A S](https://appshunter.io/developer/1778903485) |

## 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 |


### Radex

[App page](https://appshunter.io/ios/app/radex-5g-emf-detector/id6738017621)

This application measures 5G EMF radiation using your device's sensors and magnetometer. It offers an easy-to-use interface with a color-coded system for readings and supports Apple Watch integration.

**Highlights:** 5G EMF radiation detection, On-device sensor utilization, Magnetometer for accuracy, Color-coded readings, Apple Watch support

**Features:** macOS Compatibility, Apple Watch app, 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 Radex free?

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

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

Radex shows ads; Solar System Clock does not.

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

Solar System Clock ships an update every 6 weeks, and Radex every 2 months. Most recently, Solar System Clock was updated on September 30, 2026 and Radex on September 29, 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.*