Cosmic Eye vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cosmic Eye
Explore the universe from subatomic particles to the observable cosmos with incredible zoom capabilities. View real astronomical and microscopic photographs alongside stunning computer-generated models. This app offers a journey through scales inspired by iconic scientific visualizations.
- Enormous zoom factors
- Subatomic to cosmic scales
- Real photographs
- Computer model renderings
- Inspired by 'Powers of Ten'
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Cosmic Eye allows to user to zoom in and out of a preset image, by enormous zoom factors, reaching down the smallest known sub-atomic particles and up to the entire observable universe. Where possible, the app displays real photographs obtained with modern objectives, telescopes, and microscopes. Other views are phenomenal renderings of state-of-the-art computer models. This app draws inspiration from a progression of increasingly accurate graphical representations of the scales of our Universe, including the classical movie “Powers of Ten” (1977), directed by Charles and Ray Eames.
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 Cosmic Eye's $0.99. Stars Units Sizes Objects also leads on rating (4.2 vs 2.9) and review sentiment (80% vs 38%). Cosmic Eye's advantage is ads (none vs shown) and ratings volume (88 vs 5). On device support and iOS requirement 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; Cosmic Eye costs $0.99 up front. Cosmic Eye 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 2.9. That said, the two scores are not equally well evidenced: Cosmic Eye has 88 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 38% of Cosmic Eye's written reviews are positive against 80% of Stars Units Sizes Objects's.
Cosmic Eye ships an update every 6 weeks, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 17, 2026 and September 22, 2026 respectively.
| Parameter | Cosmic Eye | Stars Units Sizes Objects |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 2.9 (88 ratings) | 4.2 (5 ratings) — better |
| Positive reviews | 38.2% of reviews | 80.0% of reviews — better |
| Number of ratings | 88 — 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, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 42 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Danail Obreschkow | Mudarmeen Munlin |
Customer experience
Cosmic Eye
Stars Units Sizes Objects
Bugs and requests
Cosmic Eye
Reported bugs
7 issues- Upgrade not working
- In-app purchase not working after payment
- App crashes on load
- Cannot move camera freely
- Low resolution graphics
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- Only loads in portrait mode
- Banner ad present despite screenshots showing no ads
Requested features
17 requests- Zoom out of the universe and into the atomic nucleus
- Zoom in to Planck length and out to beyond the universe
- Make it so we can zoom out of the universe and very far into the atomic nucleus
- Make it so we can zoom in all the way to Planck length and all the way out to Beyond the universe
- Make it so we can zoom out of the universe and very far into the atomic nucleus
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- Make it so we can zoom in all the way to Planck length and all the way out to Beyond the universe
- Add multiverse functionality
- Add other universes
- Add our universe after zooming out of the cosmic web
- Turn off automatic zoom
- Make it possible to zoom without it zooming automatically
- Make it possible to turn off resetting at the end
- Make the speed slower
- Allow replacement of the initial photo with a photo of loved ones
- Slow down the display significantly for screensaver use
- Disable auto-lock for screensaver use
- Add more detailed sections between jumps in scale
Stars Units Sizes Objects
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Cosmic Eye
- Cosmic Eye ProFree
Stars Units Sizes Objects
No in-app purchases
Questions
Is Cosmic Eye free?
Is Stars Units Sizes Objects free?
Which has better reviews, Cosmic Eye or Stars Units Sizes Objects?
Do Cosmic Eye or Stars Units Sizes Objects have ads?
Which is updated more often, Cosmic Eye or Stars Units Sizes Objects?
Other comparisons
