Comparison

Solar System Sim vs Juno

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Solar System Sim

Simulate and explore celestial bodies within our solar system and beyond. Create your own solar systems, experiment with gravity and physics, and observe orbital mechanics in action.

Highlights
  • Explore planets and moons
  • Visit nearby stars
  • Create custom solar systems
  • Gravity and physics simulation
  • Recalculate orbits
  • Newton's laws implementation
Features
Read full description

Zoom from a planet's surface out to distant galaxies, then reshape the whole system with your own hands. Solar System Sim is a real-time gravity sandbox built on Newton's laws and real astronomical data. Every body you add, move or destroy recalculates the orbits of everything else, live. • Smash worlds together: impact craters carve into the surface, firestorms sweep the globe, and glowing debris rains back down. • Build your own universe: add planets, moons, asteroids and comets with their own size, mass and looks, or customise the ones already there. • Land anywhere: drop to a first-person view on any planet's surface and experience its environment. • Sculpt rings: add particle rings and watch gravity shape them in real time. • Witness real eclipses: solar and lunar, with real-world astronomical precision. • Follow comets: watch them streak past and interact with the bodies they meet. • Leave the Solar System: travel to remarkable nearby stars and find them within the Milky Way. • Feel the scale: see the true vastness of space, from a pebble-sized moon to the nearest galaxies. Whether you're here to learn how gravity really works or just to break planets with it, explore at your own pace. Start your cosmic adventure with Solar System Sim.

About

Juno

Build and test rockets, planes, and cars with realistic physics in a 3D aerospace sandbox. Progress through a career mode, unlock new technology, and share your creations with a global community.

Highlights
  • 3D aerospace sandbox
  • Realistic physics simulation
  • Career mode with tech tree
  • Customizable part resizing and reshaping
  • Download and share user-created crafts
  • Realistic orbit simulation
  • Interactive tutorials
Features
Read full description

Juno: New Origins is a 3D aerospace simulator where players can build and test rockets, planes, cars, or anything they can imagine in an environment with realistic physics across land, sea, air, and space. This is the free-to-play version, including most of the content from the Complete Edition, with the rest being available to purchase as 3 individual bundles right from the app. If you would prefer a one-time purchase, please check out "Juno: New Origins Complete Ed." on the App Store. AEROSPACE SANDBOX Juno: New Origins is a 3D aerospace sandbox where players can use customizable parts to construct and test rockets, planes, cars, or anything they can imagine in an environment with realistic physics across land, sea, air, and space, and a vast system to explore. CAREER MODE + TECH TREE Take control of your own aerospace company and earn money and tech points as you progress through the game. Complete contracts to earn money, and discover a mixture of hand-crafted and procedural contracts that offer countless hours of new gameplay. Conquer milestones and explore landmarks to earn tech points and unlock new technology in the tech tree. Interactive tutorials are available to show how to build and operate rockets, cars, and airplanes. RESIZE AND RESHAPE PARTS Stretch and shape fuel tanks, wings, cargo bays, fairings, and nose cones with easy-to-use tools that help you create exactly what you want. Resize solar panels, landing gear, pistons, etc to fit your needs. Paint your craft custom colors and textures, and even change the material properties to make it transparent, metallic and even shiny. DOWNLOAD CRAFTS AND SHARE Download from a huge collection of user-uploaded crafts and sandboxes on https://simplerockets.com. Upload your own crafts and sandboxes and share them with the community. Rise through the ranks from a white level builder to a gold level builder and beyond and make friends from all around the world. REALISTIC ORBIT SIMULATION Orbits are realistically simulated and support time-warp so you don't have to wait several months to reach another planet. The Map View makes it easy to see your orbits and plan future burns, which you can use to set up future encounters with other planets or satellites. UPGRADE YOUR EXPERIENCE Bring your game to a next level with bundles that adapt to your playing style. Customize and automate your crafts with the Engineer Bundle, break physics and unleash your wildest designs with the Sandbox Bundle, or conquer the Juno System and become rich with the Career Bundle. ENGINEER BUNDLE * Become an engineer Easily tweak the parameters that define both the looks and function of rocket engines, jet engines, propellers and wheels * Become a programmer Automate your crafts with an easy to use visual programming language called Vizzy * Become a designer Create subassemblies to use them as templates when creating your crafts SANDBOX BUNDLE * Unleash the beast Get access to all the in-flight cheats such as infinite fuel and teleport, and the designer's Tinker Panel madness allowing you to change hundreds of hidden parameters * Get the full sandbox experience Get access to all the planets and launch locations in sandbox mode and keep as many crafts in flight as you want to conquer the Juno System * Explore community systems Choose between hundreds of custom systems made by other players and get ready to explore them in a couple clicks CAREER BUNDLE * Meet 3 new customers Professor von Pricklespac, General Chuck Schafer and the director of the Droo Space Center, Evelyn Shotwell * Dozens of new unique contracts Unlock new launch locations, bring payloads to orbit, explore the planets and moons of Juno... and many other new challenges to beat * Complete your career * Unlock the full Tech Tree and visit all the landmarks in the Juno System

Screenshots

Solar System Sim4 screens
Juno4 screens

Verdict

The call

The clearest difference is rating: Solar System Sim at 4.5 against Juno's 3.8. Solar System Sim also leads on update cadence (every 5 days vs monthly) and review sentiment (81% vs 62%). On price, ads, in-app purchases and monetization model 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. Solar System Sim sells 5 one-off in-app purchases and Juno sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Solar System Sim holds the better App Store score, 4.5 against 3.8. That said, the two scores are not equally well evidenced: Solar System Sim has 4.4K ratings behind it against 326, so its average is the more settled of the two. Written reviews point the same way: 81% of Solar System Sim's written reviews are positive against 62% of Juno's.

UpkeepUpdate frequency

Solar System Sim ships an update every 5 days, Juno monthly. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
Solar System Sim versus Juno: the parameters behind the verdict, then further details
ParameterSolar System SimJuno
PriceFreeFree
Rating4.5 (4.4K ratings) — better3.8 (326 ratings)
Positive reviews80.8% of reviews — better61.8% of reviews
Number of ratings4.4K — better326
Update frequencyEvery 5 days — betterMonthly
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.014.0 — better
Further details — not scored
Size522 MB412 MB
Age rating4+4+
DeveloperWPCJundroo, LLC

Customer experience

Solar System Sim

All ratings4,331 ratings
Positive86.3%
Neutral5.4%
Negative8.3%
Written reviews1,239 reviews
Positive80.8%
Neutral9.4%
Negative9.8%

Juno

All ratings309 ratings
Positive67.6%
Neutral9.7%
Negative22.7%
Written reviews272 reviews
Positive61.8%
Neutral9.6%
Negative28.7%

User reviews

Solar System Sim

From 4.4K App Store ratings

What we love

  • 🚀 Realistic simulation
  • 🚀 Detailed solar system
  • 🚀 Ability to create custom solar systems
  • 🚀 Impressive graphics
  • 🚀 Frequent updates

Room to improve

  • 🐛 Crashes and glitches
  • 🔋 High battery consumption
  • 💰 Excessive ads
  • 🐛 Saving and loading issues
  • 🐛 Unstable orbits

Juno

From 326 App Store ratings

What we love

  • 🚀 Great graphics
  • 👍 Interesting and fun gameplay
  • 🚀 Impressive 3D simulation
  • 👍 Detailed rocket/plane building
  • 🚀 Realistic physics

Room to improve

  • 🐛 Buggy and crashes frequently
  • 🔧 Complicated controls and UI, especially on mobile
  • 💰 Paywall for many features
  • 🔧 Lack of tutorials or guidance for beginners
  • 🔧 Difficult to delete or modify existing builds

Bugs and requests

Solar System Sim

Reported bugs

5 issues
  • Planets/moons disappearing after saving and loading
  • Bright flashes and screen distortions
  • Planets/objects getting stuck inside stars
  • Crashes when colliding or editing certain objects
  • Inconsistent orbital mechanics and moons ejecting from planets

Requested features

10 requests
  • Add more galaxy and nebula textures
  • Implement realistic supernova effects
  • Allow customization of planet atmospheres and terrain
  • Add binary star systems and rogue planets
  • Introduce a galaxy maker and collision feature
Show 5 more
  • Implement a reverse time lapse option
  • Add more speed options (128x, 256x, etc.)
  • Introduce a population counter and life simulation for planets
  • Allow custom city lights and vegetation on planets
  • Add a Roche limit feature to observe tidal disruption

Juno

Reported bugs

5 issues
  • Engines not igniting properly
  • Inability to restore purchases
  • Sandbox mode missing key parts
  • Severe performance issues on some devices
  • Inconsistent part movement and attachment

Requested features

5 requests
  • Add more plane and rocket parts
  • Improve mobile optimization and controls
  • Implement a more comprehensive tutorial system
  • Add a 'delete all' or 'clear' option
  • Introduce a free sandbox mode with all features unlocked

In-app purchases

5 purchases

Solar System Sim

One-time5
  • HD Mars$2.99
  • HD Earth$2.99
  • HD Moon$2.99
Show 2 more
  • No-ads$3.99
  • HD 3-body pack$6.99
4 purchases

Juno

One-time4
  • Engineer Bundle$0.99
  • Remove Ads$1.99
  • Sandbox Bundle$2.99
Show 1 more
  • Career Bundle$4.99

Questions

Is Solar System Sim free?
Solar System Sim is free to download, with in-app purchases available.
Is Juno free?
Juno is free to download, with in-app purchases available.
Which has better reviews, Solar System Sim or Juno?
Solar System Sim is rated higher. Solar System Sim averages 4.5 out of 5 from 4.4K ratings, while Juno averages 3.8 from 326 ratings.
Do Solar System Sim or Juno have ads?
Both Solar System Sim and Juno show ads.
Which is updated more often, Solar System Sim or Juno?
Solar System Sim ships an update every 5 days, and Juno monthly. Most recently, Solar System Sim was updated on November 1, 2026 and Juno on October 30, 2026.

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