Comparison

Solar Walk vs Space 4D+

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

Head to head
About

Solar Walk

Explore a detailed 3D model of our solar system and the universe. Interact with planets, moons, and satellites, and take virtual flights through space. Travel through time to see the universe's past and learn with educational movies.

Highlights
  • Interactive 3D solar system model
  • Virtual flights between celestial bodies
  • Time travel feature for historical views
  • Educational movies about space
  • Orrery and true-to-scale view modes
  • Milky Way Galaxy view
Features
Read full description

Solar Walk is an amazing 3D model of our Solar system bringing the universe to the palm of your hand and allowing you to interact with planets, satellites, moons, comets and other space objects anytime and anywhere. Start your fascinating journey through the realms of space and learn more about the universe we live in. *** Over 6 million users!*** *** National Parenting Publications Awards (NAPPA) - GOLD winner in the Educational Tools for Parents and Children category! *** *** A Parents’ Choice Gold Award Winner *** “Simply amazing.” - Macworld “Solar Walk serves up a visually impressive 3D model of our solar system. Set against a haunting, atmospheric soundscape, the app shows planets and satellites in their correct positions, and offers mini movies, facts and other related tidbits.” - TNW “This jaw-dropping app provides a wholly interactive 3D model of our solar system, one that’s had me hooked for days. It’s the kind of thing you can imagine a science teacher using in the classroom of the future — except that we don’t have to wait.” - CNet “Zoom from Mercury to Pluto (which makes the cut in this app), passing each planet’s moons along the way. Because Solar Walk knows what time it is, the planets are in proper orientation to the Sun: Earth is dark where it is currently night and gradually lightens to daytime on the other side.” - NY Times "It's great for showing my students the relative positions of the planets in the solar system, the satellites orbiting the Earth and our place in the galaxy. Awesome with a smartboard as well." - by jbrown61 Solar Walk enables you to: ► Observe the 3D model of our Solar system with all its objects in real time and in a proper orientation. Turn into an astronomer and explore planets, moons, satellites, asteroids, dwarf planets, comets, stars and other celestial bodies. Enjoy gorgeous graphics and visuals while navigating through the solar system. ► Make virtual flights from one space object to another. ► Travel in time and see what the universe and our Solar system looked like at a certain period. ► Find an exciting view of the Milky Way Galaxy. ► Watch a collection of educational solar system movies to learn about space-related topics including Earth's moon phases, Earth's cycles, tidal phenomena, and zodiacal constellations. ► Enjoy 3D planetarium with the help of special glasses and activating the anaglyph mode. ► Share interesting screenshots of the app with your friends. ► Choose the view mode comfortable for you (orrery/true-to-scale). The app contains In-App Purchases. Solar Walk is a great educational tool appropriate for both adults and children. The amount of information users can learn about the planets, moons, satellites and other celestial bodies is impressive. All information is age-appropriate and detailed. Animated video clips will make learning about our Solar system even more engaging. Start exploring the universe with Solar Walk!

About

Space 4D+

Explore the wonders of space with augmented reality flashcards. This app brings planets, satellites, and space missions to life with interactive 3D models and informative facts. Experience space like never before, engaging for both children and adults.

Highlights
  • Augmented reality space exploration
  • Interactive 3D models of celestial bodies
  • Informative facts about planets and missions
  • Engaging for all ages
  • Scans printed space cards
Read full description

Flashcards are no longer boring with Octagon 4D+. Created by Octagon Studio, Space 4D+ is a fast and lightweight app that allows you to scan the printed space cards and witness how the space come alive right before your eyes! Space 4D+ gives you both interesting and informative facts in AR mode about space such as Solar System, Planets, Space objects, Satellites, Rovers, Space Missions Etc. The Space 4D+ app brings you a new way of seeing space in Augmented Reality. This gives you an unforgettable experience and will always leave a smile on the faces of children and adults alike. Get in touch with our support team faster! You can post questions about the app, ask for help with an issue, or give us feedback here: info@octagonstudio.com --- Grab the flashcards on https://octagon.studio/octagon-linktree/

Screenshots

Solar Walk4 screens
Space 4D+4 screens

Verdict

The call

The clearest difference is price: Space 4D+ at Free against Solar Walk's $4.99. Space 4D+ also leads on in-app purchases (none vs 11) and update cadence (every 2 months vs every 5 months). Solar Walk's advantage is rating (4.7 vs 3.4) and review sentiment (72% vs 37%). On ads 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

Space 4D+ is free to download; Solar Walk costs $4.99 up front. Solar Walk sells 11 one-off in-app purchases. Space 4D+ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Solar Walk holds the better App Store score, 4.7 against 3.4. That said, the two scores are not equally well evidenced: Solar Walk has 8.1K ratings behind it against 46, so its average is the more settled of the two. Written reviews point the same way: 72% of Solar Walk's written reviews are positive against 37% of Space 4D+'s.

UpkeepUpdate frequency

Solar Walk ships an update every 5 months, Space 4D+ every 2 months. The most recent releases landed on September 24, 2026 and June 11, 2026 respectively.

Scorecard8 real differences · 2 level
Solar Walk versus Space 4D+: the parameters behind the verdict, then further details
ParameterSolar WalkSpace 4D+
Price$4.99Free — better
Rating4.7 (8.1K ratings) — better3.4 (46 ratings)
Positive reviews72.2% of reviews — better36.8% of reviews
Number of ratings8.1K — better46
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.011.0 — better
Further details — not scored
Size451 MB300 MB
Age rating4+4+
DeveloperVito Technology Inc.Octagon Studio Ltd

Customer experience

Solar Walk

All ratings8,149 ratings
Positive93.1%
Neutral3.5%
Negative3.5%
Written reviews461 reviews
Positive72.2%
Neutral7.2%
Negative20.6%

Space 4D+

All ratings46 ratings
Positive52.2%
Neutral10.9%
Negative37.0%
Written reviews38 reviews
Positive36.8%
Neutral13.2%
Negative50.0%

Bugs and requests

Solar Walk

Reported bugs

4 issues
  • App crashes on launch for some users
  • In-app purchases not working correctly
  • Freezing and performance issues on older devices
  • Incorrect planet/moon positioning and timing

Requested features

5 requests
  • Add more planets, moons, and objects to the solar system
  • Expand to include other star systems and galaxies
  • Improve navigation and controls for easier exploration
  • Offer more free content instead of paid add-ons
  • Fix reported bugs and crashes

Space 4D+

Not enough reviews yet to summarise bugs or requests.

In-app purchases

11 purchases

Solar Walk

One-time11
  • Mission of Cassini-HuygensFree
  • Cycles of the Earth SystemFree
  • Major Circles of LatitudeFree
Show 8 more
  • Movies BundleFree
  • 3D Satellites in Real TimeFree
  • Planets of the Solar SystemFree
  • What is a Solar Eclipse?Free
  • The Moon Phases ExplanationFree
  • Zodiacal ConstellationsFree
  • High Resolution Bundle$1.99
  • All Additional Content - Sale$2.99
None

Space 4D+

No in-app purchases

Questions

Is Solar Walk free?
Solar Walk costs $4.99, and also offers in-app purchases.
Is Space 4D+ free?
Space 4D+ is free to download, with no in-app purchases.
Which has better reviews, Solar Walk or Space 4D+?
Solar Walk is rated higher. Solar Walk averages 4.7 out of 5 from 8.1K ratings, while Space 4D+ averages 3.4 from 46 ratings.
Do Solar Walk or Space 4D+ have ads?
Neither Solar Walk nor Space 4D+ shows ads.
Which is updated more often, Solar Walk or Space 4D+?
Solar Walk ships an update every 5 months, and Space 4D+ every 2 months. Most recently, Solar Walk was updated on September 24, 2026 and Space 4D+ on June 11, 2026.

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