PlanetenSpielundApp2b vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PlanetenSpielundApp2b
An educational game designed for children to explore and learn about celestial bodies, including planets, moons, stars, and black holes. It features a gravitation arena to demonstrate Newton's laws of motion.
- Learn about planets, moons, and stars
- Explore black holes and nebulae
- Gravitation arena for physics demonstrations
- Interactive celestial body learning
- Newton's laws of motion explained
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Educational game for children to learn the celestial bodies (all planets included, many known moons, asteroids, stars, black holes and the latest a nebula). We still have some celestial bodies in the works - please leave them in the comment if a specific celestial body is to be included. A gravitation arena where you can see, Newton Laws in action. Lernspiel für Kinder zum Erlernen der Himmelskörpern (alle Planeten dabei, bekannte Monde, Asteroiden, Stern, schwarze Löcher). Wir haben noch einige Himmelskörper in Arbeit - bitte in die Kommentar hinterlassen, wenn ein bestimmter Himmelskörper aufgenommen werden soll. Eine Gravitationsarena, wo Newton Gesetze wirken.
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: Stars Units Sizes Objects at 4.3 against PlanetenSpielundApp2b's 3.5. Stars Units Sizes Objects also leads on ratings volume (6 vs 2) and iOS requirement (11.0 vs 18.0). PlanetenSpielundApp2b's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, update cadence, 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.
Stars Units Sizes Objects holds the better App Store score, 4.3 against 3.5. Both are backed by a comparable volume of ratings — 2 and 6 respectively.
PlanetenSpielundApp2b ships an update every 7 months, Stars Units Sizes Objects every 4 months. Both last shipped on November 3, 2026.
| Parameter | PlanetenSpielundApp2b | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (2 ratings) | 4.3 (6 ratings) — better |
| Positive reviews | — | 80.0% of reviews |
| Number of ratings | 2 | 6 — better |
| Update frequency | Every 7 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 | 18.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 152 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Steffen Rokosch | Mudarmeen Munlin |
Customer experience
PlanetenSpielundApp2b
Stars Units Sizes Objects
In-app purchases
PlanetenSpielundApp2b
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is PlanetenSpielundApp2b free?
Is Stars Units Sizes Objects free?
Which has better reviews, PlanetenSpielundApp2b or Stars Units Sizes Objects?
Do PlanetenSpielundApp2b or Stars Units Sizes Objects have ads?
Which is updated more often, PlanetenSpielundApp2b or Stars Units Sizes Objects?
Other comparisons
