Comparison

Exoplanet Explorer vs Hubble Space Telescope Tracker

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

Head to head
About

Exoplanet Explorer

Explore a vast catalog of over 6,000 confirmed exoplanets with detailed scientific data. Compare worlds, visualize habitable zones, and track new discoveries. Ideal for stargazers, students, educators, and researchers.

Highlights
  • 6,000+ confirmed exoplanets
  • Detailed scientific data
  • Advanced filtering and sorting
  • Planet comparison tool
  • Habitable zone analysis
  • Home screen widgets
  • Apple Watch companion app
Features
Read full description

Explore the universe of exoplanets — over 6,000 confirmed worlds orbiting distant stars, updated from leading scientific archives. Track new discoveries as they happen and dive into the data behind every planet. EXPLORE THE COSMOS Search, filter, and sort the complete catalogue of confirmed exoplanets. Find planets by discovery method, star type, orbital characteristics, or habitability potential. Every entry includes detailed scientific data from peer-reviewed sources. ATMOSPHERIC SPECTRA Browse JWST and Hubble transmission spectra for planets where atmospheric data is available. Toggle molecular overlays for CO2, CH4, H2O, CO and more to see which absorption features have been detected. 3D SYSTEM VIEW Step into a planetary system in 3D — see each planet's orbit around its host star with realistic shading and a visualisation of the habitable zone. On iPhone and iPad you can also place a system into your environment in AR. COMPARE WORLDS Analyze exoplanets side-by-side — or compare them with Solar System planets like Earth, Jupiter, and Mars. Compare sizes, masses, orbital periods, star properties, and habitability scores to understand what makes each world unique. HABITABLE ZONE VISUALIZATION See exactly where planets orbit within their star's habitable zone — the region where liquid water could exist. Identify potentially Earth-like worlds and understand the conditions for life beyond our solar system. FEATURES • 6,000+ confirmed exoplanets with detailed scientific data • Atmospheric spectra with molecular overlays • 3D system view with AR mode • Advanced filtering and sorting • Planet comparison tool with Solar System reference • Habitable zone analysis • Spotlight search with deep linking • Home screen widgets • Apple Watch companion app • Bookmark favorites with iCloud sync • Available on iPhone, iPad, Mac, Apple Watch, and Apple Vision Pro GO PREMIUM Enjoying the app? Premium takes it further — unlimited bookmarks, the full planet comparison tool, and additional widgets. A small yearly upgrade that makes a big difference. Whether you're a curious stargazer, student, educator, or researcher, Exoplanet Explorer puts the cosmos in your pocket. Terms of Use (EULA): https://the-exoplanets.space/eula/ Privacy Policy: https://the-exoplanets.space/privacy/

About

Hubble Space Telescope Tracker

Follow NASA's Hubble Space Telescope mission in real time. Explore a gallery of stunning images, engage in discussions, and learn about space. Receive notifications for new discoveries and test your knowledge with quizzes.

Highlights
  • Real-time mission progress
  • Image gallery
  • Discussion forums
  • Notifications for new images
  • 3D Solar system model
  • Ask an Astronomer feature
Features
Read full description

With Hubble Space Telescope Tracker app, you can follow the mission's progress in real time. Check out the latest images in the gallery and discuss topics in the discussions. Receive notifications about new images. App offers - First Images - Live information - Image Gallery - Discussion - Ask an Astronomer - Frequently Asked Questions - Quiz - Wallpapers - 3D Solar system What is Hubble Space Telescope? The Hubble Space Telescope is a powerful space-based observatory launched in 1990. It captures detailed images of distant galaxies and celestial objects in visible, ultraviolet, and infrared light. Positioned above Earth's atmosphere, it provides clear, distortion-free views, leading to groundbreaking discoveries in astronomy. Operated jointly by NASA and ESA, Hubble has significantly expanded our understanding of the universe.

Screenshots

Exoplanet Explorer4 screens
Hubble Space Telescope Tracker4 screens

Verdict

The call

The clearest difference is review sentiment: Exoplanet Explorer at 100% against Hubble Space Telescope Tracker's 0%. Exoplanet Explorer also leads on rating (4.6 vs 1.0) and ads (none vs shown). Hubble Space Telescope Tracker's advantage is iOS requirement (12.0 vs 18.0). On price, 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. Exoplanet Explorer sells 4 in-app purchases, starting at $2.99 per 3 months and Hubble Space Telescope Tracker sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Exoplanet Explorer holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Exoplanet Explorer has 70 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of Exoplanet Explorer's written reviews are positive against 0% of Hubble Space Telescope Tracker's.

UpkeepUpdate frequency

Exoplanet Explorer ships an update every 2 weeks, Hubble Space Telescope Tracker every 3 months. The most recent releases landed on October 25, 2026 and November 1, 2026 respectively.

Scorecard7 real differences · 3 level
Exoplanet Explorer versus Hubble Space Telescope Tracker: the parameters behind the verdict, then further details
ParameterExoplanet ExplorerHubble Space Telescope Tracker
PriceFreeFree
Rating4.6 (70 ratings) — better1.0 (2 ratings)
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings70 — better2
Update frequencyEvery 2 weeks — betterEvery 3 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, Mac, Apple Watch, Vision Pro — betteriPhone, iPad, iPod
Requires iOS18.012.0 — better
Further details — not scored
Size171 MB72 MB
Age rating4+4+
DeveloperCarsten KnoblichKAKHA GIORGASHVILI

Customer experience

Exoplanet Explorer

All ratings70 ratings
Positive90.0%
Neutral4.3%
Negative5.7%
Written reviews10 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Hubble Space Telescope Tracker

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews4 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

4 purchases

Exoplanet Explorer

Subscriptions2
  • 3 months subscription7 Days trial$2.993 Months
  • 12 months subscription7 Days trial$6.991 Year
One-time2
  • Big supporting tip$2.99
  • Really big supporting tip$4.99
1 purchases

Hubble Space Telescope Tracker

One-time1
  • Premium$2.99

Questions

Is Exoplanet Explorer free?
Exoplanet Explorer is free to download, with in-app purchases available.
Is Hubble Space Telescope Tracker free?
Hubble Space Telescope Tracker is free to download, with in-app purchases available.
Which has better reviews, Exoplanet Explorer or Hubble Space Telescope Tracker?
Exoplanet Explorer is rated higher. Exoplanet Explorer averages 4.6 out of 5 from 70 ratings, while Hubble Space Telescope Tracker averages 1.0 from 2 ratings.
Do Exoplanet Explorer or Hubble Space Telescope Tracker have ads?
Hubble Space Telescope Tracker shows ads; Exoplanet Explorer does not.
Which is updated more often, Exoplanet Explorer or Hubble Space Telescope Tracker?
Exoplanet Explorer ships an update every 2 weeks, and Hubble Space Telescope Tracker every 3 months. Most recently, Exoplanet Explorer was updated on October 25, 2026 and Hubble Space Telescope Tracker on November 1, 2026.

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