Stars Units Sizes Objects vs Satellite Rotation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Satellite Rotation
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These are 3D animations of the top 10 largest satellites in the solar system. 1.Ganymede : Satellite of Jupiter radius : 2,632km (1.52 times the moon) 2.Titan : Satellite of Saturn radius : 2,575km (1.48 times the moon) 3.Callisto : Satellite of Jupiter radius : 2,409km (1.39 times the moon) 4.Io : Satellite of Jupiter radius : 1,821km (1.05 times the moon) 5.Moon : Satellite of Earth radius : 1,737km 6.Europa : Satellite of Jupiter radius : 1,562km (0.9 times the moon) 7.Triton : Satellite of Neptune radius : 1,353km (0.78 times the moon) 8.Titania : Satellite of Uranus radius : 789km (0.45 times the moon) 9.Rhea : Satellite of Saturn radius : 764km (0.44 times the moon) 10.Oberon : Satellite of Uranus radius : 761km (0.44 times the moon) ･You can change the rotation speed of the satellite. ･When you press the button, the angle of the sun changes by 30 degrees each time. ･The fastest thing is one revolution per second.The slowest thing is one rotation in 300 seconds (5 minutes). ･When checked, reverse rotation will occur.
Screenshots
Verdict
The clearest difference is price: Stars Units Sizes Objects at Free against Satellite Rotation's $0.99. Satellite Rotation's advantage is ads (none vs shown). On update cadence, in-app purchases, device support and iOS requirement 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
Stars Units Sizes Objects is free to download; Satellite Rotation costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stars Units Sizes Objects ships an update every 4 months, Satellite Rotation every 7 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | Stars Units Sizes Objects | Satellite Rotation |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.3 (6 ratings) — better | — |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 4 months — better | Every 7 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 | 11.0 |
| Further details — not scored | ||
| Size | 124 MB | 31 MB |
| Age rating | 4+ | 17+ |
| Developer | Mudarmeen Munlin | Masahiro Tomosada |
In-app purchases
Stars Units Sizes Objects
No in-app purchases
Satellite Rotation
No in-app purchases
Questions
Is Stars Units Sizes Objects free?
Is Satellite Rotation free?
Do Stars Units Sizes Objects or Satellite Rotation have ads?
Which is updated more often, Stars Units Sizes Objects or Satellite Rotation?
Other comparisons
