ARPlanets 2 vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ARPlanets 2
Explore the augmented reality Solar System with interactive 3D models and intuitive gestures. Learn basic and advanced astronomy concepts through engaging AR lessons.
- Augmented reality Solar System exploration
- Interactive 3D model manipulation
- Discover celestial body details
- AR-based astronomy lessons
- User-friendly interface
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Introducing ARPlanets 2! Completely rewritten from scratch to offer the ultimate user experience this app will bring the entire augmented reality Solar System into your pocket! The AR user experience is of the highest level with total control of the models thanks to intuitive gestures. The new great AR Lessons section will teach you with nice lessons in augmented reality basic astronomy concepts such as Kepler's Laws up to advanced notions such as differential photometry. Learning has never been so beautiful! -> Main features - User friendly user interface aimed at offering the maximum user experience - Completely manipulate 3D models thanks to very simple gestures. - Discover the names of the most interesting areas of the Moon, Mars and Jupiter simply by getting closer with your phone! - Learn notions of basic astronomy in augmented reality such as the Earth-Moon system and Kepler's Laws up to advanced topics such as differential photometry thanks to the AR Lessons section! Learning has never been so beautiful!
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 4.2 against ARPlanets 2's 3.3. Stars Units Sizes Objects also leads on in-app purchases (none vs 1) and review sentiment (80% vs 57%). ARPlanets 2's advantage is ads (none vs shown) and update cadence (every 6 weeks vs every 4 months). On price 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. ARPlanets 2 sells 1 one-off in-app purchase. Stars Units Sizes Objects asks for nothing beyond the download.
Stars Units Sizes Objects holds the better App Store score, 4.2 against 3.3. Both are backed by a comparable volume of ratings — 15 and 5 respectively. Written reviews point the same way: 57% of ARPlanets 2's written reviews are positive against 80% of Stars Units Sizes Objects's.
ARPlanets 2 ships an update every 6 weeks, Stars Units Sizes Objects every 4 months. The most recent releases landed on September 27, 2026 and September 22, 2026 respectively.
| Parameter | ARPlanets 2 | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (15 ratings) | 4.2 (5 ratings) — better |
| Positive reviews | 57.1% of reviews | 80.0% of reviews — better |
| Number of ratings | 15 — better | 5 |
| Update frequency | Every 6 weeks — better | Every 4 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 423 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Daniele Citi | Mudarmeen Munlin |
Customer experience
ARPlanets 2
Stars Units Sizes Objects
In-app purchases
ARPlanets 2
- Full Access AR$1.99
Stars Units Sizes Objects
No in-app purchases
Questions
Is ARPlanets 2 free?
Is Stars Units Sizes Objects free?
Which has better reviews, ARPlanets 2 or Stars Units Sizes Objects?
Do ARPlanets 2 or Stars Units Sizes Objects have ads?
Which is updated more often, ARPlanets 2 or Stars Units Sizes Objects?
Other comparisons
