Comparison

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.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • Simulates mega-constellation orbits
  • Visualizes impact on stargazing
  • Adjustable location, time, and date
  • Explores effects on astronomy
  • Shows current and planned constellations
Features
Read full description

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

Stars Units Sizes Objects4 screens
Mega Constellations4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Mega Constellations sells 1 one-off in-app purchase. Stars Units Sizes Objects asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Stars Units Sizes Objects versus Mega Constellations: the parameters behind the verdict, then further details
ParameterStars Units Sizes ObjectsMega Constellations
PriceFreeFree
Rating4.2 (5 ratings)5.0 (1 ratings) — better
Positive reviews80.0% of reviews—
Number of ratings5 — better1
Update frequencyEvery 4 monthsEvery 5 days — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.0
Further details — not scored
Size124 MB16 MB
Age rating4+4+
DeveloperMudarmeen MunlinHanno Rein

Customer experience

Stars Units Sizes Objects

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Mega Constellations

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stars Units Sizes Objects

No in-app purchases

1 purchases

Mega Constellations

One-time1
  • Developer Appreciation Coffee$1.99

Questions

Is Stars Units Sizes Objects free?
Stars Units Sizes Objects is free to download, with no in-app purchases.
Is Mega Constellations free?
Mega Constellations is free to download, with in-app purchases available.
Which has better reviews, Stars Units Sizes Objects or Mega Constellations?
Mega Constellations is rated higher. Stars Units Sizes Objects averages 4.2 out of 5 from 5 ratings, while Mega Constellations averages 5.0 from 1 ratings.
Do Stars Units Sizes Objects or Mega Constellations have ads?
Stars Units Sizes Objects shows ads; Mega Constellations does not.
Which is updated more often, Stars Units Sizes Objects or Mega Constellations?
Stars Units Sizes Objects ships an update every 4 months, and Mega Constellations every 5 days. Most recently, Stars Units Sizes Objects was updated on September 22, 2026 and Mega Constellations on October 8, 2026.

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