Solar System Clock vs Radex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Solar System Clock
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.
- Planet and moon time displays
- Analog and digital clock formats
- Interactive solar system map
- Customizable widgets
- Planetary season information
- Time translation between celestial bodies
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No AI was used in the making of this app, including code and visual assets. The app comes with the Earth and Mars clocks free of charge (including associated moons), and additional planet clocks can be purchased through the app or the App Store. The purchase also includes the new customisable widgets and the current and past positions of supported objects. Did you ever want to know the time on Saturn? The simple Solar System Clock can tell the time on any planet or dwarf planet, and the Sun in relation to Earth time. Calculated from the starting date of the Gregorian calendar, the app displays seconds, minutes, hours, days and years for each object based on orbit and rotation data. The time is given in both analog and digital formats and can be stopped and restarted for easy viewing, while keeping to the accurate localised time. A single analog clock face for all planets and dwarf planets is also included, and can be split into two clocks for main planets and dwarf planets. Times can be freely translated between planets, the Sun and moons. The app also provides the current and past positions of the planets, moons and dwarf planets to scale in the form of an interactive map, and the seasons on every planet and dwarf planet. A widget form of the Earth and Mars clocks is provided for circular widget slots on Apple Watch, and widgets on other supported devices can be customised within the app. An iMessage extension is also included to enable easy communication using the time systems. The main clock can also be projected as functional wall art.
Radex
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.
- 5G EMF radiation detection
- On-device sensor utilization
- Magnetometer for accuracy
- Color-coded readings
- Apple Watch support
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Radex is a mobile app which detects the 5G EMF Radiation on the device and around the enviroment, the software is calibrated with professional equipment and using on device sensors and magnetometer to measure accuracy. It is free and easy to use with a color code for reading. This app comes with support for Apple Watch.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 9, 2026 respectively.
| Parameter | Solar System Clock | Radex |
|---|---|---|
| Price | Free | Free |
| Rating | — | 2.3 (3 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 33.3% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 18.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Sunita George | NETM S A S |
Customer experience
Solar System Clock
Radex
In-app purchases
Solar System Clock
- All Planets and Dwarf Planets$2.99
Radex
No in-app purchases
Questions
Is Solar System Clock free?
Is Radex free?
Do Solar System Clock or Radex have ads?
Which is updated more often, Solar System Clock or Radex?
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