Comparison

SDO Viewer vs Exoplanet Explorer

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

Head to head
About

SDO Viewer

Access and view the latest images from the Solar Dynamics Observatory. Receive push notifications when new images become available, keeping you updated on solar activity.

Highlights
  • Download SDO images
  • Display latest solar images
  • Push notifications for new images
  • Courtesy of NASA/SDO science teams
Features
Read full description

SDO Viewer is a simple application for downloading and displaying the latest images taken by the Solar Dynamics Observatory (SDO). It includes push notifications so you can be notified by a badge on the application when new images are available. SDO Viewer, by the creator of SoHO Viewer. Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.

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/

Screenshots

SDO Viewer4 screens
Exoplanet Explorer4 screens

Verdict

The call

The clearest difference is rating: Exoplanet Explorer at 4.6 against SDO Viewer's 3.0. Exoplanet Explorer also leads on review sentiment (100% vs 60%) and update cadence (every 2 weeks vs every 2 months). SDO Viewer's advantage is in-app purchases (none vs 4) and iOS requirement (13.0 vs 17.6). On price 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. Exoplanet Explorer sells 4 in-app purchases, starting at $2.99 per 3 months. SDO Viewer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Exoplanet Explorer holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Exoplanet Explorer has 70 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 60% of SDO Viewer's written reviews are positive against 100% of Exoplanet Explorer's.

UpkeepUpdate frequency

SDO Viewer ships an update every 2 months, Exoplanet Explorer every 2 weeks. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

Scorecard8 real differences · 2 level
SDO Viewer versus Exoplanet Explorer: the parameters behind the verdict, then further details
ParameterSDO ViewerExoplanet Explorer
PriceFreeFree
Rating3.0 (5 ratings)4.6 (70 ratings) — better
Positive reviews60.0% of reviews100.0% of reviews — better
Number of ratings570 — better
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Apple Watch, Vision Pro — better
Requires iOS13.0 — better17.6
Further details — not scored
Size6 MB169 MB
Age rating4+4+
DeveloperJérôme DiazCarsten Knoblich

Customer experience

SDO Viewer

All ratings5 ratings
Positive20.0%
Neutral60.0%
Negative20.0%
Written reviews10 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

Exoplanet Explorer

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

In-app purchases

None

SDO Viewer

No 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

Questions

Is SDO Viewer free?
SDO Viewer is free to download, with no in-app purchases.
Is Exoplanet Explorer free?
Exoplanet Explorer is free to download, with in-app purchases available.
Which has better reviews, SDO Viewer or Exoplanet Explorer?
Exoplanet Explorer is rated higher. SDO Viewer averages 3.0 out of 5 from 5 ratings, while Exoplanet Explorer averages 4.6 from 70 ratings.
Do SDO Viewer or Exoplanet Explorer have ads?
Neither SDO Viewer nor Exoplanet Explorer shows ads.
Which is updated more often, SDO Viewer or Exoplanet Explorer?
SDO Viewer ships an update every 2 months, and Exoplanet Explorer every 2 weeks. Most recently, SDO Viewer was updated on October 7, 2026 and Exoplanet Explorer on October 11, 2026.

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