Comparison

Stars Units Sizes Objects vs Orbital Simulator

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

Orbital Simulator

Explore orbital mechanics through interactive simulations and real-time solar system data. Learn about Kepler's Laws, practice orbital maneuvers, and engage in mission objectives. Ideal for students and space enthusiasts.

Highlights
  • Interactive orbital simulations
  • Kepler's Laws visualization
  • Orbital maneuver practice
  • Real-time solar system view
  • Customizable orbital parameters
  • Detailed educational content
  • Mission-based challenges
Features
Read full description

Embark on an interactive journey through space with Orbital Simulator: Explore. This comprehensive app is designed to educate and engage users of all levels, from space enthusiasts to students, offering a deep dive into the fascinating world of orbital mechanics. Key Features: Interactive Simulations: Experiment with circular, elliptical, and hyperbolic orbits. See how changing parameters like semi-major axis, eccentricity, and inclination affect trajectories. Kepler’s Laws: Visualize and understand Kepler’s three laws of planetary motion with clear, interactive simulations. Orbital Maneuvers: Practice key maneuvers such as Hohmann transfers, Lambert transfers, and circularizations. Learn how these maneuvers are used in real space missions. Real-Time Solar System: View real-time positions of planets and moons within our solar system. Understand how celestial bodies interact and move over time. Customizable Parameters: Adjust orbital parameters and see the immediate effects on your spacecraft's trajectory. Experiment with different scenarios and learn through hands-on experience. Educational Content: Access detailed explanations, tutorials, and guides designed to enhance your understanding of space mechanics and celestial navigation. Dynamic Environment: Navigate complex gravitational fields in various scenarios, including binary star systems and multi-body interactions. Mission Objectives: Engage in missions that challenge you to establish orbits, perform transfers, and navigate through dynamic environments. Each mission helps you apply theoretical knowledge to practical scenarios. Visual Trajectory Paths: Visualize the path of your spacecraft with real-time trajectory lines. Understand the impact of your maneuvers and improve your navigation skills. Why Choose Orbital Simulator: Explore? For Space Enthusiasts and Students: Whether you’re a budding astronomer or a seasoned space enthusiast, this app offers valuable insights and engaging content for all levels. Educational Tool: Ideal for classroom settings or individual study, providing interactive and immersive learning experiences. User-Friendly Interface: Intuitive controls and clear visuals make it easy to understand complex concepts. Constant Updates: We continuously update the app with new features, scenarios, and educational content to keep your learning experience fresh and relevant. Download Orbital Simulator: Explore now and embark on your journey through the stars. Master the art of orbital mechanics, explore the intricacies of celestial navigation, and experience the wonder of the cosmos. Join a community of space enthusiasts and students who are exploring the universe, one orbit at a time. Ready to become an orbital mechanic? Your adventure starts here!

Screenshots

Stars Units Sizes Objects4 screens
Orbital Simulator4 screens

Verdict

The call

The clearest difference is rating: Orbital Simulator at 5.0 against Stars Units Sizes Objects's 4.2. Orbital Simulator also leads on update cadence (fortnightly vs every 4 months). On price, ratings volume, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Orbital Simulator holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 5 respectively.

UpkeepUpdate frequency

Stars Units Sizes Objects ships an update every 4 months, Orbital Simulator fortnightly. The most recent releases landed on September 7, 2026 and July 8, 2026 respectively.

Scorecard2 real differences · 8 level
Stars Units Sizes Objects versus Orbital Simulator: the parameters behind the verdict, then further details
ParameterStars Units Sizes ObjectsOrbital Simulator
PriceFreeFree
Rating4.2 (5 ratings)5.0 (5 ratings) — better
Positive reviews80.0% of reviews—
Number of ratings55
Update frequencyEvery 4 monthsFortnightly — better
AdsYesYes
In-app purchasesNoNo
MonetizationAd-supportedAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better12.0
Further details — not scored
Size124 MB247 MB
Age rating4+17+
DeveloperMudarmeen MunlinRenzo Macedo

Customer experience

Stars Units Sizes Objects

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

Orbital Simulator

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stars Units Sizes Objects

No in-app purchases

None

Orbital Simulator

No in-app purchases

Questions

Is Stars Units Sizes Objects free?
Stars Units Sizes Objects is free to download, with no in-app purchases.
Is Orbital Simulator free?
Orbital Simulator is free to download, with no in-app purchases.
Which has better reviews, Stars Units Sizes Objects or Orbital Simulator?
Orbital Simulator is rated higher. Stars Units Sizes Objects averages 4.2 out of 5 from 5 ratings, while Orbital Simulator averages 5.0 from 5 ratings.
Do Stars Units Sizes Objects or Orbital Simulator have ads?
Both Stars Units Sizes Objects and Orbital Simulator show ads.
Which is updated more often, Stars Units Sizes Objects or Orbital Simulator?
Stars Units Sizes Objects ships an update every 4 months, and Orbital Simulator fortnightly. Most recently, Stars Units Sizes Objects was updated on September 7, 2026 and Orbital Simulator on July 8, 2026.

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