Universe in a Nutshell vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Universe in a Nutshell
Explore the vastness of the universe, from subatomic particles to distant galaxies, through an interactive, swipe-based journey. Understand true scale by comparing objects and discover fascinating facts about over 250 animated illustrations. Immerse yourself in the cosmos with original music.
- Interactive scale exploration
- Seamless zooming from 10^-35m to 10^26m
- Fun facts about objects
- Explanations for each object
- Over 250 animated illustrations
- Original music soundtrack
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The range of size in the universe, from the tiniest particles to the epic galaxies - we take you on a journey of size that lets you explore it all with a single swipe. How big is a planet, compared to a human? And how small is an atom really? You can’t fully wrap your head around the scope of things by just reading about them – so this app lets you experience them in comparison to get a feeling for their true scale. By simply swiping you can zoom in and out all the way from the world of fundamental particles up to the largest stars at the edge of the observable universe. Seamless zooming between the scales of 10^-35 meters to 10^26 meters (no math required) Amazing fun facts for various scale levels, like the smallest bacterium and the largest black hole Tap any object for an explanation of what it is and how it works Beautifully animated illustration of more than 250 objects Original Kurzgesagt music to complement your experience
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 price: Stars Units Sizes Objects at Free against Universe in a Nutshell's $2.99. Stars Units Sizes Objects also leads on iOS requirement (11.0 vs 13.0). Universe in a Nutshell's advantage is rating (4.9 vs 4.3) and ads (none vs shown). On 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
Stars Units Sizes Objects is free to download; Universe in a Nutshell costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Universe in a Nutshell holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Universe in a Nutshell has 2.5K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 89% of Universe in a Nutshell's written reviews are positive against 80% of Stars Units Sizes Objects's.
Universe in a Nutshell ships an update every 4 days, Stars Units Sizes Objects every 4 months. Both last shipped on October 31, 2026.
| Parameter | Universe in a Nutshell | Stars Units Sizes Objects |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.9 (2.5K ratings) — better | 4.3 (6 ratings) |
| Positive reviews | 89.1% of reviews — better | 80.0% of reviews |
| Number of ratings | 2.5K — better | 6 |
| Update frequency | Every 4 days — better | Every 4 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Best chart rank | #51 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 320 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | in a nutshell - kurzgesagt GmbH | Mudarmeen Munlin |
Customer experience
Universe in a Nutshell
Stars Units Sizes Objects
Bugs and requests
Universe in a Nutshell
Reported bugs
2 issues- Crashes on launch for some users
- Overlapping hit boxes make it difficult to select certain objects
Requested features
6 requests- Add more objects to explore (e.g. Uranus, Eris, more moons, etc.)
- Implement a search function to quickly find specific objects
- Add the ability to compare multiple objects side-by-side
- Include more in-depth scientific information and facts
- Provide an option to have the descriptions read aloud
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- Improve the smoothness of zooming and panning
Stars Units Sizes Objects
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Universe in a Nutshell
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Universe in a Nutshell free?
Is Stars Units Sizes Objects free?
Which has better reviews, Universe in a Nutshell or Stars Units Sizes Objects?
Do Universe in a Nutshell or Stars Units Sizes Objects have ads?
Which is updated more often, Universe in a Nutshell or Stars Units Sizes Objects?
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