Curved Spaces vs Stars Units Sizes Objects
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Curved Spaces
Explore multi-connected universes with this flight simulator. Visualize how light wraps around complex spaces, creating repeating crystalline patterns. It's a tool for students and researchers in topology and cosmology.
- Multi-connected universe simulation
- Visualizes light wrapping
- Crystalline pattern display
- Topology research tool
- Cosmology research tool
- Educational for 3-manifolds
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Curved Spacess is a flight simulator for multi-connected universes. Because light itself wraps around such a space, inhabitants see their universe’s contents repeating in a crystalline pattern, like a hall of mirrors but with no reflection. Curved Spaces is intended for undergraduates and graduate students studying 3‑manifolds, and has also found use as a research tool in topology and cosmology. Recreational math enthusiasts may instead prefer Torus Games, which offers 3D Mazes and 3D Tic-Tac-Toe in a variety of multi-connected 3D spaces, along with games on multi-connected 2D surfaces.
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: Curved Spaces at 4.8 against Stars Units Sizes Objects's 4.2. Curved Spaces also leads on ads (none vs shown) and monetization model (free vs ad-supported). Stars Units Sizes Objects's advantage is iOS requirement (11.0 vs 14.0). On price, update cadence, 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.
Curved Spaces holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: Curved Spaces has 25 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 92% of Curved Spaces's written reviews are positive against 80% of Stars Units Sizes Objects's.
Curved Spaces ships an update every 5 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 3, 2026 and September 22, 2026 respectively.
| Parameter | Curved Spaces | Stars Units Sizes Objects |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (25 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | 92.3% of reviews — better | 80.0% of reviews |
| Number of ratings | 25 — better | 5 |
| Update frequency | Every 5 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 11 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Jeff Weeks | Mudarmeen Munlin |
Customer experience
Curved Spaces
Stars Units Sizes Objects
In-app purchases
Curved Spaces
No in-app purchases
Stars Units Sizes Objects
No in-app purchases
Questions
Is Curved Spaces free?
Is Stars Units Sizes Objects free?
Which has better reviews, Curved Spaces or Stars Units Sizes Objects?
Do Curved Spaces or Stars Units Sizes Objects have ads?
Which is updated more often, Curved Spaces or Stars Units Sizes Objects?
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