Comparison

Encyclopedia vs GPT Solar System Explorer

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

Head to head
About

Encyclopedia

Explore the solar system with extensive articles and high-definition images. This app offers comprehensive information, engaging content, and a user-friendly interface, making it suitable for both children and adults interested in space.

Highlights
  • Thousands of articles and HD photos
  • Comprehensive solar system information
  • Engaging and easy-to-understand content
  • Offline availability
  • Badge collection for reading
  • Intuitive user interface
Features
Read full description

Travel through our celestial neighborhood in 386 illustrated articles on the Sun, planets, moons, smaller bodies and the history of solar-system exploration. START WITH FIVE FREE ARTICLES New readers can choose any five different articles. Your chosen articles stay unlocked, and revisiting them never uses another choice. Existing readers keep previously granted access. MAKE DISCOVERIES YOUR OWN • Search article titles and full text • Follow links between related topics • Save articles and return to your reading position • Continue recent reading and track your progress • Explore connections through the timeline and graph • Find article sources and image credits inside the app CHOOSE YOUR ACCESS Own the full encyclopedia with a one-time purchase for complete offline reading. Or choose monthly or annual Premium for the full encyclopedia plus AI chat grounded in this subject's articles. Eligible new Premium subscribers receive a three-day introductory trial. Subscriptions renew automatically unless canceled through your App Store account. Current local prices and terms appear before purchase. Restore Purchases recovers eligible previous purchases. Earlier full-version ownership includes encyclopedia and offline access; Premium AI requires a subscription. Internet access is required for AI chat and purchases. AI answers may contain errors; consult the linked sources. Article text is derived from Wikipedia. Images come from appropriately licensed Wikimedia Commons and other open sources. Source links, licenses and credits are available in the app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

GPT Solar System Explorer

Explore our Solar System in an interactive 3D environment powered by AI. Discover stunning images and videos from space agencies, and ask your AI guide anything about the cosmos. Perfect for curious minds of all ages.

Highlights
  • Interactive 3D Solar System model
  • AI-powered cosmic guide
  • NASA, SpaceX, ESA imagery & videos
  • Planet and mission details
  • Voice-activated Q&A
  • Intuitive controls for all ages
Features
Read full description

Get ready for an out-of-this-world experience. This interactive 3D space app, powered by advanced AI, brings the wonders of our Solar System to life. Discover breathtaking images and videos from NASA, SpaceX, Roscosmos, the Chinese Space Agency, ESA, and more. Fly from planet to planet, explore the Moon and Sun, and get up close with stunning space photography and footage. The intuitive controls make space exploration easy for both kids and adults. Touch down on any planet and choose from the menu:  - About the Planet – Learn about its structure, atmosphere, and unique features.  - Photos & Videos – Browse exclusive images of spacecraft, planetary landscapes, and historic space missions. - Missions – Discover lunar and Mars rovers, deep-space probes, and Elon Musk’s vision for colonizing Mars using Starships and more Meet your cosmic AI space guide. Curious about black holes? Wondering how astronauts live in space? Just tap the mic button in the lower-right corner and ask anything. Your AI guide holds vast knowledge of the cosmos and adapts to your preferred style, whether you want a simple explanation or a deep scientific breakdown. Download now and embark on a space journey with your AI companion! *** This app offers auto-renewable subscriptions for one month and one year. Your subscription renews automatically 24 hours before the current period ends. You can cancel anytime in your device settings. For details, please review our Privacy Policy: https://kidify.games/privacy-policy/ and Terms of Use: https://kidify.games/terms-of-use/

Screenshots

Encyclopedia4 screens
GPT Solar System Explorer4 screens

Verdict

The call

The clearest difference is review sentiment: Encyclopedia at 83% against GPT Solar System Explorer's 0%. Encyclopedia also leads on monetization model (free with in-app purchases vs subscription). GPT Solar System Explorer's advantage is rating (4.7 vs 3.8) and update cadence (every 2 weeks vs monthly). On price, ads, in-app purchases 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. Encyclopedia sells 1 one-off in-app purchase and GPT Solar System Explorer sells 5 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

GPT Solar System Explorer holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: GPT Solar System Explorer has 90 ratings behind it against 14, so its average is the more settled of the two. Written reviews complicate that: 83% of Encyclopedia's written reviews are positive against 0% of GPT Solar System Explorer's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Encyclopedia ships an update monthly, GPT Solar System Explorer every 2 weeks. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.

Scorecard5 real differences · 5 level
Encyclopedia versus GPT Solar System Explorer: the parameters behind the verdict, then further details
ParameterEncyclopediaGPT Solar System Explorer
PriceFreeFree
Rating3.8 (14 ratings)4.7 (90 ratings) — better
Positive reviews83.3% of reviews — better0.0% of reviews
Number of ratings1490 — better
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size322 MB288 MB
Age rating4+4+
DeveloperGood Spider, LLCApic Ways

Customer experience

Encyclopedia

All ratings14 ratings
Positive71.4%
Neutral0.0%
Negative28.6%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

GPT Solar System Explorer

All ratings90 ratings
Positive92.2%
Neutral1.1%
Negative6.7%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

1 purchases

Encyclopedia

One-time1
  • Full Version$2.99
5 purchases

GPT Solar System Explorer

Subscriptions4
  • Monthly Pro Subscription$5.991 Month
  • Monthly Super Pro Subscription$19.991 Month
  • Monthly Ultra Pro Subscription$29.991 Month
Show 1 more
  • Yearly Pro Subscription$39.991 Year
One-time1
  • AI coins$5.99

Questions

Is Encyclopedia free?
Encyclopedia is free to download, with in-app purchases available.
Is GPT Solar System Explorer free?
GPT Solar System Explorer is free to download, with in-app purchases available.
Which has better reviews, Encyclopedia or GPT Solar System Explorer?
GPT Solar System Explorer is rated higher. Encyclopedia averages 3.8 out of 5 from 14 ratings, while GPT Solar System Explorer averages 4.7 from 90 ratings.
Do Encyclopedia or GPT Solar System Explorer have ads?
Neither Encyclopedia nor GPT Solar System Explorer shows ads.
Which is updated more often, Encyclopedia or GPT Solar System Explorer?
Encyclopedia ships an update monthly, and GPT Solar System Explorer every 2 weeks. Most recently, Encyclopedia was updated on October 4, 2026 and GPT Solar System Explorer on October 8, 2026.

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