Comparison

Solar System (Lite) vs Stars Units Sizes Objects

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Solar System (Lite)

Explore the Solar System with interactive simulations and size comparisons. This educational app makes learning about planets, galaxies, and space exploration engaging for children. It offers a kid-friendly interface with no ads or in-app purchases.

Highlights
  • Interactive simulations
  • Size comparisons of celestial bodies
  • Planetary orbital speed visualization
  • Covers Milky Way, Sun, planets, dwarf planets
  • Kid-friendly navigation
  • No ads or in-app purchases
Features
Read full description

The perfect way for kids to experience the Solar System in a hands-on way! This interactive science book contains a select 18 pages from the full version of the app. ----- INTERACTIVE CONTENT ----- Even as an adult, it can be difficult to visualize just how massive the Sun is or how fast the different planets orbit the Sun. This app uses interactive simulations to allow children to explore these hard to visualize topics in a hands-on way. •••• Size Comparison •••• This page allows children to compare the sizes of many Solar System objects. Comparable objects include the Sun, the planets, major moons, and all the dwarf planets. •••• Planetary Revolutions •••• The planets are shown orbiting the Sun at their comparative speeds. Selecting Neptune reveals it takes 164.8 Earth years to orbit the Sun once while the inner planets seem to orbit the Sun at a dizzying speed. Select Mercury, with a year of 88 Earth days, and the outer planets barely seem to move at all. ----- TOPICS COVERED ----- • The Milky Way galaxy • The Sun • A list of the planets • A list of the dwarf planets • Planetary size comparisons • Planet orbital speeds • The history of space exploration ----- KID FRIENDLY ----- • Easy to use page navigation and search • NO ads • NO in-app purchases ----- FULL VERSION ----- For a more in depth look at the Solar System, consider buying the full version. The full version contains 58 pages of content! •••• Parents •••• The full version of the app is sure to captivate any child with its myriad of interesting facts, striking visuals, and engaging 3D simulations. Not only is the content fascinating to explore, it's educational too! Designed with grade school curriculum in mind, the app covers the major topics of the Solar System while explaining concepts in an easy to understand manner. •••• Teachers •••• Many schools with iPads in the classroom have already used the full version of the app with great success. The interactive content is well suited for teaching complex topics such as planetary seasons and the vast distances of the Solar System. Children can explore this information independently or with the aid of a teacher. ----- MORE INFORMATION ----- Visit http://vosonos.net/product/solar-system-lite

About

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.

Highlights
  • 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
Features
Read full description

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

Stars Units Sizes Objects4 screens

Verdict

The call

The clearest difference is ads: Solar System (Lite) at none against Stars Units Sizes Objects's shown. Solar System (Lite) also leads on rating (4.5 vs 4.2) and monetization model (free vs ad-supported). Stars Units Sizes Objects's advantage is device support (3 vs 1). On price, review sentiment, update cadence and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Solar System (Lite) holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 23 and 5 respectively. Written reviews point the same way: 83% of Solar System (Lite)'s written reviews are positive against 80% of Stars Units Sizes Objects's.

UpkeepUpdate frequency

Solar System (Lite) ships an update every 3 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on July 6, 2026 and September 7, 2026 respectively.

Scorecard6 real differences · 4 level
Solar System (Lite) versus Stars Units Sizes Objects: the parameters behind the verdict, then further details
ParameterSolar System (Lite)Stars Units Sizes Objects
PriceFreeFree
Rating4.5 (23 ratings) — better4.2 (5 ratings)
Positive reviews83.3% of reviews — better80.0% of reviews
Number of ratings23 — better5
Update frequencyEvery 3 months — betterEvery 4 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPadiPhone, iPad, iPod — better
Requires iOS8.0 — better11.0
Further details — not scored
Size91 MB124 MB
Age rating4+4+
DeveloperVosonos LLCMudarmeen Munlin

Customer experience

Solar System (Lite)

All ratings23 ratings
Positive87.0%
Neutral0.0%
Negative13.0%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Stars Units Sizes Objects

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

None

Solar System (Lite)

No in-app purchases

None

Stars Units Sizes Objects

No in-app purchases

Questions

Is Solar System (Lite) free?
Solar System (Lite) is free to download, with no in-app purchases.
Is Stars Units Sizes Objects free?
Stars Units Sizes Objects is free to download, with no in-app purchases.
Which has better reviews, Solar System (Lite) or Stars Units Sizes Objects?
Solar System (Lite) is rated higher. Solar System (Lite) averages 4.5 out of 5 from 23 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.
Do Solar System (Lite) or Stars Units Sizes Objects have ads?
Stars Units Sizes Objects shows ads; Solar System (Lite) does not.
Which is updated more often, Solar System (Lite) or Stars Units Sizes Objects?
Solar System (Lite) ships an update every 3 months, and Stars Units Sizes Objects every 4 months. Most recently, Solar System (Lite) was updated on July 6, 2026 and Stars Units Sizes Objects on September 7, 2026.

Other comparisons