Sol Explorer vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sol Explorer
Experience our Solar System from a first-person perspective in your own spaceship. Explore planets, moons, and space probes, traveling billions of miles across the cosmos. Learn about over 40 celestial objects and gain new perspectives on Earth and beyond.
- First-person spaceship exploration
- Travel across the entire Solar System
- Learn about 40+ celestial objects
- Explore planets, moons, and probes
- View from the edge of interstellar space
- Size comparison videos
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Get a first-person view of the planets and moons of our Solar System. Climb aboard your very own spaceship and explore... - It's your spaceship – fly wherever you want. - Cruise across the entire Solar System – over eight billion miles end to end. - Stop and learn about any object you see – moons, planets, and space probes. Over 40 celestial objects in all. - Observe Mars, explore the moons of Jupiter, fly through the rings of Saturn, travel to the edge of interstellar space. - Fly to the distant edge of the Solar System and look back on Earth. - Watch the Size of the Planets video and get amazing perspective on the planets in our Solar System – then explore some more.
Stars Units Sizes Objects
Explore the vastness of the universe, from the smallest particles to the largest cosmic structures. Compare object sizes, view detailed images, and perform unit conversions across a wide range of astronomical scales. Learn about stars, galaxies, and the incredible distances between them.
- Compare object sizes
- View object images
- Pinch/Zoom and Pan images
- Unit conversion for distances
- Explore scales from Planck length to observable universe
- Learn about stars and galaxies
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Size of the smallest to largest objects and stars. Compare the size of objects in the universe. Object images. Pinch/Zoom image. Pan/Move image. Rotate image. Double tap to reset an image. From the smallest to the largest one. From planck length to observable universe. From Yoctometre, Zeptometre, Attometre, Femtometre, Picometre, Nanometre, Micro, Millimetre, Centimetre, Metre, KiloMetre, Lightyear, Parsecs, Billion Lightyears to 93 Billion Lightyears. Size of objects, particles, atoms, cells, stars and galaxies. Get to know the stars. Get to know the spaces. get to know the universe. How small is this world. How big is the universe. And How great is the creator. How far is the star distance from earth. Two way 18 distance unit conversion. planck length, yoctometer, zeptometer, attometer, femtometer, picometre, nanometre, micrometre, Millimeter, Centimeter, Meter, Kilometer, Inch, Foot, Mile, Astronomical, Lightyear, Parsecs. Perform auto conversion when picker is changed. Share conversion result. Reset unit convertor.
Screenshots
Verdict
The clearest difference is rating: Sol Explorer at 5.0 against Stars Units Sizes Objects's 4.3. Sol Explorer also leads on ads (none vs shown) and review sentiment (100% vs 80%). Stars Units Sizes Objects's advantage is update cadence (every 4 months vs every 86 months) and iOS requirement (11.0 vs 16.0). On price, ratings volume, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Sol Explorer holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 6 and 6 respectively. Written reviews point the same way: 100% of Sol Explorer's written reviews are positive against 80% of Stars Units Sizes Objects's.
Sol Explorer ships an update every 86 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.
| Parameter | Sol Explorer | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | 4.3 (6 ratings) |
| Positive reviews | 100.0% of reviews — better | 80.0% of reviews |
| Number of ratings | 6 | 6 |
| Update frequency | Every 86 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 268 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Reason Interactive | Mudarmeen Munlin |
Customer experience
Sol Explorer
Stars Units Sizes Objects
In-app purchases
Sol Explorer
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Sol Explorer free?
Is Stars Units Sizes Objects free?
Which has better reviews, Sol Explorer or Stars Units Sizes Objects?
Do Sol Explorer or Stars Units Sizes Objects have ads?
Which is updated more often, Sol Explorer or Stars Units Sizes Objects?
Other comparisons
