Comparison

DLR COMETS 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

DLR COMETS

Explore the Rosetta mission to Comet 67P/Churyumov-Gerasimenko through an interactive exhibition. Discover the science behind comets and the historic Philae lander touchdown. Relive this exceptional spaceflight adventure with multimedia content.

Highlights
  • Interactive comet model
  • Mission highlights and photographs
  • Historical background on comets
  • Rosetta mission science
  • Philae lander touchdown details
  • Personal stories from the mission
Features
Read full description

The European Rosetta mission arrived at Comet 67P/Churyumov-Gerasimenko in August 2014 after a 10-year journey through space. Three months later, the Philae robotic lander touched down on the comet – the first probe to do so in the history of humankind. It was a fantastic scientific adventure and an exceptional spaceflight project. The German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) takes you on a journey to the origins of the Solar System with this exhibition app “DLR COMETS - The Rosetta mission: Journey to the origin of the Solar System”. The centrepiece of the exhibition is a model of comet 67P/Churymov-Gerasimenko based on data from Rosetta’s OSIRIS camera system, surrounded by backlit photographs of the comet and mission highlights. Additionally to the historical and technical background on comets as important building blocks of the Solar System, the Rosetta mission and its scientific achievements to date, the exhibition includes film-clips highlighting the personal stories of the men and women that made Rosetta a reality and the deep emotions evoked by involvement in the mission.

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

DLR COMETS4 screens
GPT Solar System Explorer4 screens

Verdict

The call

The clearest difference is in-app purchases: DLR COMETS at none against GPT Solar System Explorer's 5. DLR COMETS also leads on iOS requirement (8.1 vs 15.0). On price, review sentiment, update cadence and ads 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. GPT Solar System Explorer sells 5 in-app purchases, starting at $5.99 per month. DLR COMETS asks for nothing beyond the download.

UpkeepUpdate frequency

DLR COMETS ships an update every 3 weeks, GPT Solar System Explorer every 2 weeks. The most recent releases landed on September 8, 2026 and September 21, 2026 respectively.

Scorecard3 real differences · 7 level
DLR COMETS versus GPT Solar System Explorer: the parameters behind the verdict, then further details
ParameterDLR COMETSGPT Solar System Explorer
PriceFreeFree
Rating—4.7 (90 ratings) — better
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings—90 — better
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.1 — better15.0
Further details — not scored
Size416 MB288 MB
Age rating4+4+
DeveloperDLR German Aerospace Center e.V.Apic Ways

Customer experience

DLR COMETS

Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

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

None

DLR COMETS

No in-app purchases

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 DLR COMETS free?
DLR COMETS is free to download, with no in-app purchases.
Is GPT Solar System Explorer free?
GPT Solar System Explorer is free to download, with in-app purchases available.
Do DLR COMETS or GPT Solar System Explorer have ads?
Neither DLR COMETS nor GPT Solar System Explorer shows ads.
Which is updated more often, DLR COMETS or GPT Solar System Explorer?
DLR COMETS ships an update every 3 weeks, and GPT Solar System Explorer every 2 weeks. Most recently, DLR COMETS was updated on September 8, 2026 and GPT Solar System Explorer on September 21, 2026.

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