Pocket Planets vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pocket Planets
Explore our solar system with detailed information on planets, moons, and astronauts. Track who is currently in space and receive notifications for new launches. Access NASA images and compare celestial body characteristics.
- Detailed planet and moon data
- Astronaut information and missions
- Real-time space occupancy
- Launch notifications
- NASA image gallery
- Celestial body comparisons
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Pocket Planets gives you all the information you need about our solar system and human activity in space. Learn more about all 565 astronauts who been to space. What was their mission? How long had they been up there? See who is in space now! Get notified when somebody goes into space. Get up to date information about every planet and moon in the solar system. Including: - Physical characteristics: mass, radius, density, gravity, escape velocity - Orbital characteristics: real-time distance from the Sun and Earth, orbital period, orbital speed, eccentricity, apsis, periapsis, visualise orbit - Atmosphere: pressure, atmospheric composition - Images from Nasa - Moons: compare their size and distance
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: Pocket Planets at 4.6 against Stars Units Sizes Objects's 4.2. Pocket Planets also leads on update cadence (every 3 weeks vs every 4 months) and ratings volume (22 vs 5). Stars Units Sizes Objects's advantage is review sentiment (80% vs 67%). On price, ads, in-app purchases and monetization model 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.
Pocket Planets holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 22 and 5 respectively. Written reviews complicate that: 67% of Pocket Planets's written reviews are positive against 80% of Stars Units Sizes Objects's, so the app with the better star average is not the one people write more warmly about.
Pocket Planets ships an update every 3 weeks, Stars Units Sizes Objects every 4 months. The most recent releases landed on September 8, 2026 and September 7, 2026 respectively.
| Parameter | Pocket Planets | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (22 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 66.7% of reviews | 80.0% of reviews — better |
| Number of ratings | 22 — better | 5 |
| Update frequency | Every 3 weeks — better | Every 4 months |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 66 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Ad Lunam Kereskedelmi es Szolgaltato Korlatolt Felelossegu Tarsasag | Mudarmeen Munlin |
Customer experience
Pocket Planets
Stars Units Sizes Objects
In-app purchases
Pocket Planets
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Pocket Planets free?
Is Stars Units Sizes Objects free?
Which has better reviews, Pocket Planets or Stars Units Sizes Objects?
Do Pocket Planets or Stars Units Sizes Objects have ads?
Which is updated more often, Pocket Planets or Stars Units Sizes Objects?
Other comparisons
