Stars Units Sizes Objects vs Mega Constellations
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.
Mega Constellations
Explore the visual impact of large satellite networks on the night sky. This simulator shows how current and planned mega-constellations affect stargazing based on your location, time, and date.
- Simulates mega-constellation orbits
- Visualizes impact on stargazing
- Adjustable location, time, and date
- Explores effects on astronomy
- Shows current and planned constellations
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A mega-constellation is a collection of man-made satellites orbiting the earth. They operating together to provide internet and other communication services. Because constellations span the entire globe, they have potential to aid society through enhanced connectivity of remote communities and search and rescue capabilities. However, because the satellites reflect sunlight many of them will be visible to the naked eye. The Constellations App simulates the orbits of current and planned mega-constellations. This allows you to explore the effects that these constellations will have on stargazing and astronomy depending on location, time, and date.
Screenshots
Verdict
The clearest difference is rating: Mega Constellations at 5.0 against Stars Units Sizes Objects's 4.2. Mega Constellations also leads on ads (none vs shown) and update cadence (every 5 days vs every 4 months). Stars Units Sizes Objects's advantage is in-app purchases (none vs 1) and ratings volume (5 vs 1). 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. Mega Constellations sells 1 one-off in-app purchase. Stars Units Sizes Objects asks for nothing beyond the download.
Mega Constellations holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Stars Units Sizes Objects has 5 ratings behind it against 1, so its average is the more settled of the two.
Stars Units Sizes Objects ships an update every 4 months, Mega Constellations every 5 days. The most recent releases landed on September 22, 2026 and October 8, 2026 respectively.
| Parameter | Stars Units Sizes Objects | Mega Constellations |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 4 months | Every 5 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 124 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Mudarmeen Munlin | Hanno Rein |
Customer experience
Stars Units Sizes Objects
Mega Constellations
In-app purchases
Stars Units Sizes Objects
No in-app purchases
Mega Constellations
- Developer Appreciation Coffee$1.99
Questions
Is Stars Units Sizes Objects free?
Is Mega Constellations free?
Which has better reviews, Stars Units Sizes Objects or Mega Constellations?
Do Stars Units Sizes Objects or Mega Constellations have ads?
Which is updated more often, Stars Units Sizes Objects or Mega Constellations?
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