Stars Units Sizes Objects vs 3D Star Map
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.
3D Star Map
Explore over 700 stars in our local star cluster in a 3D space simulation. Zoom, rotate, and learn about neighboring star systems with detailed information available on tap. Perfect for research or satisfying cosmic curiosity.
- 3D space exploration
- Over 700 local stars
- Detailed star information
- Zoom, rotate, and move
- Relaxing animations
- Educational content
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Explore the local cluster with over 700 stars around our Sun! Zoom, rotate, and move through the 3D space surrounding our solar system, and learn about our neighboring star systems. Tap on a star for detailed information about it, or just wander through space with beautiful and relaxing animations. Whether you're using it for research or just to feed your insatiable curiosity, the 3D Star Map is here to help you learn more about our place in the universe!
Screenshots
Verdict
The clearest difference is ads: 3D Star Map at none against Stars Units Sizes Objects's shown. 3D Star Map also leads on update cadence (every 2 weeks vs every 4 months) and review sentiment (100% vs 80%). On price, ratings volume, 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.
3D Star Map holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 5 and 9 respectively. Written reviews point the same way: 80% of Stars Units Sizes Objects's written reviews are positive against 100% of 3D Star Map's.
Stars Units Sizes Objects ships an update every 4 months, 3D Star Map every 2 weeks. The most recent releases landed on September 7, 2026 and September 1, 2026 respectively.
| Parameter | Stars Units Sizes Objects | 3D Star Map |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) | 4.4 (9 ratings) — better |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 5 | 9 — better |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 124 MB | 100 MB |
| Age rating | 4+ | 4+ |
| Developer | Mudarmeen Munlin | Alexander Winn |
Customer experience
Stars Units Sizes Objects
3D Star Map
In-app purchases
Stars Units Sizes Objects
No in-app purchases
3D Star Map
No in-app purchases
Questions
Is Stars Units Sizes Objects free?
Is 3D Star Map free?
Which has better reviews, Stars Units Sizes Objects or 3D Star Map?
Do Stars Units Sizes Objects or 3D Star Map have ads?
Which is updated more often, Stars Units Sizes Objects or 3D Star Map?
Other comparisons
